To see the other types of publications on this topic, follow the link: Explosive strength.
Journal articles on the topic 'Explosive strength'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 journal articles for your research on the topic 'Explosive strength.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.
1
Savaş, Sedat, and Dursun Bakir. "An experimental study on the blast responses of hollow core concrete slabs to contact explosions." Revista de la construcción 21, no. 3 (2022): 587–601. http://dx.doi.org/10.7764/rdlc.21.3.587.
Full textAbstract:
Measures taken against preventing damages in structures against explosive load are a popular matter of investigation among researchers. Generally, numerous studies were conducted on reinforcement materials for outer surfaces, reinforcement design, and utilizing fibers produced from various materials. In this study, a hollow-core slab was manufactured with concrete, which had a regular strength, and a design that discharged the explosive energy upon contact explosion via the hollow cores of the slabs and prevented the redirection of the explosive energy to the area below the slabs was investigated. Because the hollow-core slab in the study did not have any lateral reinforcement, the utilization of the tensile strength of the concrete proved advantageous. For this purpose, in the experimental tests of the study, contact explosions were conducted on hollow-core slabs with hollow diameters of 14 cm for each core. Before the explosion tests, the TNT equivalent of 910gr explosive was determined by performing the TNT equivalent tests. In the explosion tests of prepared hollow core concrete slabs, 125 gr, 250 gr, 375 gr, and 500 gr dynamites were used as the explosive materials. In conclusion, the explosive loads that the slabs could withstand were calculated and various slabs with distinctive hollow-core diameters were determined depending on the amount of the explosives.
2
Wang, Hai Liang, Xin Ming Li, and Jian Xin Yu. "Compressive Strength of Hardening Fluid Concrete by Explosion." Advanced Materials Research 163-167 (December 2010): 4595–98. http://dx.doi.org/10.4028/www.scientific.net/amr.163-167.4595.
Full textAbstract:
The explosion of fluid concrete under different explosive dosage is achieved by experiment as the main study means. After hardening, we carry out its compressive strength test by Shimadzu AG-X250kN electronic universal pressure machine. The experiment shows that compressive strength of hardening fluid concrete by explosion is higher than that in the same state. Explosive can increase compressive strength of concrete material.
3
Zlobin, B., V. Sil’Vestrov, A. Shtertser, A. Plastinin, and V. Kiselev. "Enhancement of Explosive Welding Possibilities by the Use of Emulsion Explosive/ Rozwój Mozliwości Łączenia Wybuchowego Przez Użycie Emulsji Wybuchowych." Archives of Metallurgy and Materials 59, no. 4 (2014): 1587–92. http://dx.doi.org/10.2478/amm-2014-0269.
Full textAbstract:
Abstract Explosive welding is an effective method of joining of various metals and alloys. However, when the materials with very different strength and thermo-physical properties are welded or thin-layer cladding is performed, the difficulties occur which call for extra investigations. In the present paper, with the couples of steel / carbide composite and copper / hardened steel used as examples, under study were the peculiarities of bonding formation by the explosive welding of metals with highly differing properties. The experiments were carried out with emulsion explosive containing hollow micro-spheres and detonating in thin layers with the low (2 - 3 km/s) detonation velocity. Obtained results show that the emulsion explosives enable to extend the explosion welding potentiality.
4
Itoh, S., Z. Liu, and Y. Nadamitsu. "An Investigation on the Properties of Underwater Shock Waves Generated in Underwater Explosions of High Explosives." Journal of Pressure Vessel Technology 119, no. 4 (1997): 498–502. http://dx.doi.org/10.1115/1.2842336.
Full textAbstract:
A cylinder expansion test for high explosives was carried out to determine JWL parameters. Using the JWL parameters, we carried out numerical simulations of the underwater shock waves generated by the underwater explosion of the high explosives. Our results showed that the behavior of the underwater shock waves at the vicinity of the explosives differs greatly from that far from the explosives. Especially, the strength of the underwater shock wave nearby the explosive rapidly decreases due to the effect of the expansion of the gas products.
5
Jitea, Ilie-Ciprian, Daniela Carmen Rus, Cristian Rădeanu, and Dragoş Gabriel Vasilescu. "Evaluation of the safety parameters for a permitted explosive type emulsion." MATEC Web of Conferences 342 (2021): 01002. http://dx.doi.org/10.1051/matecconf/202134201002.
Full textAbstract:
When preparing a permitted explosive recipe an energy or an explosive heat is considered, which should ensure the detonability of the system and at the same time a power that satisfies the purpose for which it will be used, under the conditions of firedamp hazardous mines. The safety parameters for the explosive charges used in the firedamp hazardous mines are decisive, in order to ensure the safety and health requirements at work together with the efficient performance of the blasting operation. The permitted explosive type emulsion is recommended to be used in underground mines, open pit mines as a special methane explosive and can be used where a coal dust and/or methane explosion hazard exists can be loaded into dry and wet blasting holes and it can be used for mechanical loading. The permitted explosive type emulsion is a Detonator-sensitive explosives that can be reliably initiated in an unconfined state by a No. 8 strength detonator it have safety handling characteristics because of the relatively low sensitivity to friction, shock and impact. Technological changes due to the change of suppliers of certified explosives for civil use for underground use in the firedamp hazardous mines, involve reassessing the safety and efficiency of the loads made with these products, which have not been tested and evaluated for the conditions from the Jiu Valley mines.
6
Zhang, Guo Shang, Shu Zeng Hou, Shi Zhong Wei, Ji Wen Li, and Liu Jie Xu. "Interface Structure and Properties of Explosive Welded Beryllium Bronze/Steel Composite Plates." Applied Mechanics and Materials 52-54 (March 2011): 1598–602. http://dx.doi.org/10.4028/www.scientific.net/amm.52-54.1598.
Full textAbstract:
In this study, beryllium bronze/steel composite plates were fabricated through explosive welding process using different ratios of explosive. Microstructures of the joint were examined, and then shearing strength, peeling strength, Bending tests and hardness measurements were carried out on the bonded specimens. Experimental studies show that, beryllium bronze and steel could be bonded with a good quality. The interface is wavy texture changing in turns from flat - wavelet - large wave - stable large wave beginning with initiation point. Grains near the interface are elongated parallel to the explosion direction. As the ratio of explosive increase, the amplitude and wavelength of wave are increased, which leads to the increasing of shearing strength and bonging strength. No shearing in the interface is seen from the tensile-shear tests and fracture take place in the low strength material. The bended specimens show that defects such as separation and tearing were not observed. Hardness is increased with increasing explosive ratio and the highest hardness values are obtained near the bonding interface.
7
Li, Lin Na, Dong Wang Zhong, and Chao Zhang. "Engineering Design of Underwater Explosive Containment Vessels." Applied Mechanics and Materials 303-306 (February 2013): 2831–34. http://dx.doi.org/10.4028/www.scientific.net/amm.303-306.2831.
Full textAbstract:
Underwater explosion vessel is the main equipment to experimentally study the law of underwater explosion by small quantity of explosive. It is the main equipment of explosive metalworking. In order to the safe using of underwater explosion container and the efficiency, we must accurately determine the strength of the container. Based on the actual engineering design, the brief summary about engineering design method of 10gTNT equivalent deep water explosion vessel has carried on.
8
Şahin, Murat, and Sedat Tulumcu. "Numerical Analysis of Explosion-Induced Deformations on Steel Panels in Urban Environments." Hacettepe Journal of Biology and Chemistry 52, no. 5 (2024): 267–81. https://doi.org/10.15671/hjbc.1574877.
Full textAbstract:
Explosion proof structures are designed to be very heavy and non-functional using conventional systems so that they can be resistant to blast effects. As a result, not only the emergence of non-economic structures, but also their operational performance decreases. To effectively mitigate these challenges, a substantial body of research has focused on the development and application of designs and materials specifically engineered to withstand explosive load impacts. In this study, the strength of steel plates under explosives with different energies was tested. Related tests were performed using Ls-Dyna finite element software. An experimental literature was used to calibrate the numerical model. When the results obtained as a result of the calibration were compared with the experimental data, a high level of agreement was obtained. The calibrated numerical model was subjected to burst loads by varying the panel thicknesses and its dynamic responses were simulated. The displacement values were analyzed by placing the explosives equidistant from the panel centers. By comparing the analysis results, explosive energies were compared. The most effective explosive types could be listed according to the amount of change that the evaluated explosives in the same amount caused on the panel surfaces. In line with these studies, information will be gained about what type of steel materials will be used against which type of explosives in areas that need to be protected in urban areas.
9
Skobenko, O.V., and V.V. Kulivar. "ODAY OF THE RESULTS OF RESEARCH ON THE INTERACTION OF LASER RADIATION WITH EXPLOSIVES." Annali d'Italia 51 (January 26, 2024): 36–52. https://doi.org/10.5281/zenodo.10573849.
Full textAbstract:
The paper presents the main scientific and practical results obtained by the scientists of the Dnipro Polytechnic Institute in 1992-2022. The basis of the proposed physical and mathematical model, taking into account quantum mechanical laws, is the discovered new mechanism of ignition of metal azides by a laser monopulse, due to the structural destabilization of the crystal lattice when heated by radiation of optical microinhomogeneities. Attention is focused on the developed new methods for measuring the sensitivity of explosives and the parameters of the mechanical action of explosion products. The dependence of the sensitivity of explosive compounds on the mode of formation in the volume of the material and the conditions of unloading the samples of the substance was experimentally revealed. Light-sensitive explosive composites have been developed, the sensitivity of which to the action of a laser monopulse is an order of magnitude higher than that of heavy metal azides. The scientific basis for the use of the laser initiation method has been developed to solve the problems of obtaining profiled detonation waves, explosion welding, metal hardening, creation of optical systems for initiating explosive charges, testing material strength and stability of structures subjected to mechanical loading pulses. To improve the safety of blasting operations, experimental samples of the optical initiation system and new means of detonating explosives were created.
10
Gloc, Michał, Sylwia Przybysz-Gloc, Marcin Wachowski, et al. "Research on Explosive Hardening of Titanium Grade 2." Materials 16, no. 2 (2023): 847. http://dx.doi.org/10.3390/ma16020847.
Full textAbstract:
In this investigation, three different explosive materials have been used to improve the properties of titanium grade 2: ammonal, emulsion explosives, and plastic-bonded explosives. In order to establish the influence of explosive hardening on the properties of the treated alloys, tests were conducted, including microhardness testing, microstructure analysis, and tensile and corrosion tests. It has been found that it is possible to achieve a 40% increase in tensile strength using a plastic explosive (PBX) as an explosive material. On the other hand, the impact of the shock wave slightly decreased the corrosion resistance of titanium grade 2. The change in corrosion rate is less than 0.1µm/year, which does not significantly affect the overall corrosion resistance of the material. The reduction in corrosion resistance is probably due to the surface geometry changes as a result of explosive treatment.
11
Hou, Juewen, and Tielu Li. "EFFECT OF AIR ENDURANCE TRAINING ON ATHLETE’S LOWER LIMB EXPLOSIVE STRENGTH." Revista Brasileira de Medicina do Esporte 28, no. 5 (2022): 513–16. http://dx.doi.org/10.1590/1517-8692202228052022_0068.
Full textAbstract:
ABSTRACT Introduction: The explosion force is the neuromuscular system's capacity to overcome resistance with the highest possible contraction speed. It is the result of a kinetic combination between power and speed. The effect of outdoor resistance training is used in several athletics areas to improve the explosive power of the lower limbs. However, there are still few studies focused on basketball athletes. Objective: Verify the effect of outdoor resistance training on the explosive power of the lower limbs of basketball players. Methods: The article uses mathematical statistics and randomized controlled trials by analytical comparison to explore the influence of compound training methods on basketball players’ lower explosive limb power. Results: There was no performance gain in the control group at 30 days. Was an improved ability in the experimental group jumping after high-intensity composite training. Conclusion: Compound training plays a crucial role in improving lower limb explosive power in college basketball players. Evidence Level II; Therapeutic Studies - Investigating the result.
12
Zhang, Peng. "Research on Maximum Explosive Strength and Training Methods." Journal of Education and Educational Research 10, no. 2 (2024): 142–44. http://dx.doi.org/10.54097/1qcfr260.
Full textAbstract:
Explosive force is a form of fast power performance, explosive force athletes an important part of the overall level of athletic ability, the athletes' athletic performance enhancement has a vital important role, the vast majority of sports programs have a profound significance. But from the current athletes special explosive force training situation to discuss, many athletes explosive force training often lack of specialization and effectiveness, omitted the training of special explosive force, is not conducive to the athletes personal escape performance improvement. The article mainly uses the literature method to define the maximum explosive force and discusses the importance for human sports performance. Attempts from the factors affecting explosive force, explosive force training, development of explosive force training methods, explosive force training load selection, for athletes explosive force training to mention the new training design ideas.
13
Hiroe, Tetsuyuki, Kazuhito Fujiwara, Hidehiro Hata, K. Watanabe, and Mitsuharu Yamamoto. "Mechanical Changes in Materials Caused by Explosive Precompression Shock Waves and the Effects on Fragmentation of Exploding Cylinders." Materials Science Forum 566 (November 2007): 237–42. http://dx.doi.org/10.4028/www.scientific.net/msf.566.237.
Full textAbstract:
Explosive driven rapid fracture in a structural body will be preceded by a compression process, and the compression effects on mechanical properties of the materials are clearly important to understand shock-induced failure such as spall or fragmentation phenomena. In this study, incident shock waves in plate specimens of aluminum A2017-T4 and 304 stainless steel are generated by plane detonation waves in the high explosive PETN initiated using wire-row explosion techniques, and the compressed specimens are successfully recovered without severe damages due to the reflected expansion waves with use of momentum trap method. A hydro code, Autodyn-2D is applied to determine test conditions: thicknesses of explosives, attenuators, specimens and momentum traps and to evaluate experimental results, simulating time-histories of stress waves in the layers of the test assembly. Microhardness distributions in cross-sections, tensile strength, fracture ductility and yield stress are measured for the recovered specimens, using miniature tensile and compression test pieces machined from them. They are compared with those of virgin specimens, showing significant increase of hardness, tensile and yield strength and remarkable reduction of elongation and ductility for shocked specimens. The results are taken into consideration for evaluation of experimental fragmentation energy in cylinder explosion tests.
14
Park, Gang-Kyu, Gi-Joon Park, Jung-Jun Park, Namkon Lee, and Sung-Wook Kim. "Residual Tensile Properties and Explosive Spalling of High-Performance Fiber-Reinforced Cementitious Composites Exposed to Thermal Damage." Materials 14, no. 7 (2021): 1608. http://dx.doi.org/10.3390/ma14071608.
Full textAbstract:
This study examined the effect of adding synthetic fibers, that is, polypropylene (PP) and nylon (Ny), on explosive spalling and residual tensile mechanical properties of high-performance fiber-reinforced cementitious composites (HPFRCCs). Three different matrix strengths (100 MPa, 140 MPa, and 180 MPa), four different volume contents of the synthetic fibers (0%, 0.2%, 0.4%, and 0.6%), and three different exposure time (1 h, 2 h, and 3 h) based on the Internatinoal Organization for Standardization (ISO) fire curve were adopted as variables for this experiment. The experimental results revealed that the addition of synthetic fibers improved the resistance to explosive spalling induced by high-temperature, especially when PP and Ny were mixed together. For a higher matrix strength, greater volume content of the synthetic fibers was required to prevent explosive spalling, and higher residual strengths were obtained after the fire tests. An increase in the volume fraction of the synthetic fibers clearly prevented explosive spalling but did not affect the residual tensile strength. In the case of a higher matrix strength, a reduction in the strength ratio was observed with increased exposure time.
15
Laszlo, Robert, Edward Gheorghiousu, Stefan Ilici, Aurelian Nicola, and Stefan Usurelu. "Testing the constructive strength of a container arranged as a mobile deposit of explosive materials." MATEC Web of Conferences 373 (2022): 00058. http://dx.doi.org/10.1051/matecconf/202237300058.
Full textAbstract:
Today, due to the diversity of the conditions in which the blasting works are executed, they often require a special organization regarding the transportation and storage of the explosive goods near the blasting field. If for explosive storage arranged for long-term use such as those of the producers, there are detailed regulations regarding the constructive and security requirements that they must meet, for the temporary storage facilities, there are not enough details regarding the constructive requirements that they must comply with. One of the most important aspects taken into account when designing and arranging a mobile explosive depot is the limitation to the maximum of the dynamic action and the throw effect of pieces of material under the pression of an accidental detonation. The paper describes the results obtained after testing a container prototype designed for the storage of explosives. Following the tests performed and the evaluation of the dynamic effects of explosions inside and outside the container as well as the analysis of the measurement regarding the pressure generated by the detonation of explosive charges, it turned out that the construction and detonation behavior of the tested container complies with the purpose and safety requirements for setting up a mobile explosive depot.
16
Liao, Xue Yan, Fu Qiang Shi, Zhao Wu Shen, Yao Gang Jiang, and Zhi Gang Gong. "Enhancement of Explosion Energy and Mechanical Strength of Energetic Material by Aluminum Fibre." Applied Mechanics and Materials 268-270 (December 2012): 559–62. http://dx.doi.org/10.4028/www.scientific.net/amm.268-270.559.
Full textAbstract:
In order to enforce explosion energy and mechanical strength of energetic material. we use physics and chemistry property of aluminum fire to improve the performance of energetic material. Before explosion the physics property of mechanical property can reinforce the mechanical strength; when explosion the reaction heat of aluminum can increase the energy of explosive. The air blast experimental results indicated that Al fibre can increase the energy of energetic material.. And the same time mechanical strength experimental results indicated that aluminum can enhance the strength of energetic material.
17
Kononenko, M., O. Khomenko, and A. Kosenko. "Numerical simulation of the line of least resistanceduring the explosion of charges." Collection of Research Papers of the National Mining University 69 (June 2022): 43–57. http://dx.doi.org/10.33271/crpnmu/69.043.
Full textAbstract:
Purpose. To establish the analytical regularity of the calculation of the maximum value of the line of least resistance (LLR) of the explosive (E), taking into account the physical and mechanical properties of the rock mass and the detonation characteristics of the explosive. The methodology of research. Numerical modeling by the finite element method (FEM) to change the stress-strain state of the model established the value of the LLR at different diameters of the charge cavity, the pressure of explosion products and the tensile strength of rocks. Regression analysis obtained an empirical pattern of changes in the LLR depending on the physical and mechanical properties of the rock mass and the detonation characteristics of explosives. Mathematical modeling establishes analytical regularities of LLR calculation for zones of crack formation and intensive fragmentation. Findings. According to the change in the stress state of the model material around the charging cavity, the empirical regularity of changing the maximum value of the LLR depending on the diameter of the charging cavity and the diameter of the explosive charge, the density and rate of detonation of explosives, the compressive and shear strength. According to the developed calculation scheme, analytical regularities of LLR calculation for zones of crack formation and intensive fragmentation are obtained. By comparing the results of LLR calculation according to the obtained regularities, the most correct formula for LLR calculation was chosen, which turned out to be the analytical regularity of LLR calculation for the zone of intensive fragmentation. The originality. The power law is established for determining the LLR of an E, which comprehensively takes into account the radius of the crush zone, the diameter of the charging cavity and charge, the density and detonation velocity of E, the compressive strength of rocks, their fracturing and compaction under the action of rock pressure, which makes it possible to calculate the parameters of drilling and blasting (D&B) for breaking massif along the zone of intensive fragmentation. Practical implications. According to the results of the research, an analytical regularity of the calculation of the LLR of the explosive charge in the zone of intensive fragmentation was obtained, the use of which will allow to rationalize the D&B parameters in ore mining with the help of industrial explosives.
18
Bardaro, Danilo, Alessandro Bozzolo, and Donato Zangani. "Advanced Technologies for Bombproof Cargo Containers and Blast Containment Units for the Retrofitting of Passenger Airplanes." International Journal of Aviation Systems, Operations and Training 2, no. 1 (2015): 33–47. http://dx.doi.org/10.4018/ijasot.2015010103.
Full textAbstract:
Commercial aviation can be protected from the threat of explosives in two ways, either by preventing explosives from reaching the aircraft or by mitigating the effects of an explosive by protecting the aircraft from an onboard explosion. The containment units under study aim at acting as complementary and passive security measures for passengers and cabin crew. The proposed concept is a container where an internal high strength layer made of ballistic textiles is used to stop blast fragments, coupled with an external layer deforming in a controlled way during the explosion, designed to fully contain the blast pressure. The current research builds upon the positive results of such concept from a campaign of blast tests and extending its application by developing solutions for the protection of wide-body aircrafts and addressing the Least Risk Bomb Location (LRBL) directive.
19
Zhang, Jing, Zhuowei Guo, Shengjun Sang, et al. "Preparation of bulk nano-aluminum materials from nanopowder using explosive consolidation." Journal of Applied Physics 131, no. 16 (2022): 165904. http://dx.doi.org/10.1063/5.0088053.
Full textAbstract:
To optimize powder explosive consolidation technology, an improved explosive consolidation device capable of relieving pressure was designed. Bulk nano-aluminum materials achieving more than 98% of standard density were successfully fabricated by explosive consolidation. The effect of different detonation velocities on the properties of the consolidated aluminum was investigated by varying the ratio of the ammonium nitrate explosive (AN-TNT) and wood flour to adjust the detonation velocity. The results revealed that the production of “Mach holes” (defects produced by excess energy in a converging shock wave) can be reduced by decreasing the detonation velocity. At a detonation velocity of 2158 m/s, bulk aluminum with high density, high hardness, high strength, and uniform microstructure without any Mach holes and with a grain size of about 80 nm can be achieved. The hardness of explosively consolidated aluminum was four times that of aluminum prepared by general industrial technology, and its compressive strength double that of industrially prepared aluminum.
20
Pérez Muñoz, S., D. Morilla de la Riva, G. Alonso García, A. Sánchez Muñoz, FJ Albert García, and A. Rodríguez Cayateno. "Efecto del entrenamiento de fuerza en deportistas femeninas de deportes colectivos mediante tecnología isoinercial." SPORT TK-Revista EuroAmericana de Ciencias del Deporte 10, no. 1 (2021): 79–86. http://dx.doi.org/10.6018/sportk.461691.
Full textAbstract:
El objetivo de esta investigación es analizar el efecto de un programa de fuerza mediante tecnología isoinercial durante cuatro semanas, en la mejora del rendimiento en mujeres de deportes colectivos con carácter intermitente. La muestra estaba compuesta por seis mujeres con una edad media de 21±1.79 años. Se realizaron los test de cambios de dirección V-cut, fuerza explosiva counter movement jump y repeated sprint ability sobre 40 m. Los principales resultados muestran que se mejoraron todas las variables analizadas mediante el entrenamiento con tecnología isoinercial. Además, presentaron diferencias significativas (p<.05) en las variables de fuerza explosiva y de repeated sprint ability. Por lo tanto, un programa de entrenamiento de fuerza a través de tecnología isoinercial durante cuatro semanas de entrenamiento es suficiente para la mejora de los cambios de dirección, la resistencia a la repetición de esprines y la fuerza explosiva de piernas. The aim of this research is to analyse the effect of a four-week strength programme using isoinertial technology on performance improvement in women in team sports on an intermittent basis. The sample was composed of six women with an average age of 21 (±1.79 years). The tests of V-cut direction changes, explosive force counter movement jump and repeated sprint ability over 40 m were performed. The main results show that all the variables analysed are improved by training with isoinertial technology. They present significant differences (p<.05) in the variables of explosive strength and repeated sprint ability. Therefore, a strength training program using isoinertial technology during four weeks of training is sufficient for the improvement of direction changes, resistance to repeated sprinting and explosive leg strength.
21
Kosturek, Robert. "The concept of improvement high-strength aluminum alloys FSW joint properties via post-weld explosive treatment." Scientific journal of the Ternopil national technical university 107, no. 3 (2022): 125–30. http://dx.doi.org/10.33108/visnyk_tntu2022.03.125.
Full textAbstract:
The study describes the theoretical background and technological aspects of the post-weld explosive treatment of high-strength aluminum alloy FSW joints. Although FSW allows to effective join high-strength aluminum alloys, the heat generated during the process causes undesirable changes in the strengthening phase, giving a joint efficiency of about 80%. The load-carrying capabilities of these joints can be increased via post-weld treatment (e.g. shot peening, laser shock peening). The new, potential post-weld treatment that is presented in this paper is based on the affection of the welded joint by a shock wave generated during the detonation of explosive material. Such post-weld explosive treatment would result in the hardening of the low-hardness zone, which often determines the mechanical properties of precipitation-hardened aluminum alloy FSW joints. Studies show that explosive welding of annealed aluminum alloys increases their microhardness by about 25% as the result of a high-velocity collision. If a similar effect can be achieved in explosive hardening, the microhardness of the low-hardness zone will increase entailing an improvement of entire joint mechanical properties. The variety of explosives materials used in metalworking (covering the values of detonation velocity from about 2000 m/s to 8000 m/s) and different systems for shock-wave affection gives many technological possibilities. In this work are discussed two different explosive hardening systems: with direct placement of explosive material on a treated welded plate and with an additional driven plate, which provides a higher pressure impulse. Considering that affecting of high amplitude shock wave introduces defects into the structure and decreases residual stresses in the welded joints, the application of an appropriate technological system creates a potential for improving the load-carrying capacities of discussed joints, especially in a condition of cyclic loading.
22
Saravanan, S., and K. Raghukandan. "Diffusion Kinetics in Explosive Cladding of Dissimilar Alloys as Described through the Miedema Model/ Kinetyka Procesu Dyfuzji W Układach Platerów Wytwarzanych Z Wykorzystaniem Energii Wybuchu, Na Bazie Stopów O Silnie Odmiennych Właściwościach, Opisanych Modelem Miedema." Archives of Metallurgy and Materials 59, no. 4 (2014): 1615–18. http://dx.doi.org/10.2478/amm-2014-0274.
Full textAbstract:
Abstract Explosive cladding of dissimilar plates is achieved by the intensive deformation occurring at high pressure and temperature generated from the detonating explosive at the collision interface. The interface morphology, with its characteristic undulations, is dictated by the extent of kinetic energy spent at the mating interface. Nevertheless, the inter-metallic compound formation at the mating interface weakens the joint. The prediction of the probability of inter-metallic formation at aluminum-SS 304, copper-SS 304 and titanium-SS 304 explosive cladding interfaces is attempted in this study by employing Miedema model. Granular explosives (detonation velocity: 4000 m/s) and parallel plate combination were employed with uni-loading ratio (standoff distance-5 mm). The influence of chemical energy in determining the bond strength of explosive clads is discussed as well.
23
Kuz'min, V. I., V. I. Lysak, and E. V. Kuz’min. "Investigation of the Influence of Kinematic and Energy Parameters on the Structure and Strength of Explosion-Welded Steel-Aluminum Composite." Solid State Phenomena 316 (April 2021): 62–67. http://dx.doi.org/10.4028/www.scientific.net/ssp.316.62.
Full textAbstract:
The work is devoted to a study of the probable causes of a decrease in joint strength during explosion welding of metals with sharply differing physical and mechanical properties. The influence of kinematic and energy parameters on the structure and strength of the steel-aluminum composite under various conditions of explosive loading is shown.
24
Liu, Hua Ning, Yu Zheng, Jian Bo Liu, and Wen Bin Li. "The Effect of Tube Materials on Metal Jet Initiating the Confined Composition B." Advanced Materials Research 1014 (July 2014): 175–79. http://dx.doi.org/10.4028/www.scientific.net/amr.1014.175.
Full textAbstract:
The implementation and validation of a numerical model of the confined Composition B initiated by a metal jet has been studied by AUTODYN-2D. Two different tube thicknesses were used representing strong and weak confinement initiating system. In another contrast, various materials such as Nylon, St45 and Tungsten alloy were adopted to investigate the influence of tube yield stress on the confined explosives initiation behaviour. The results show that, in both cases, the confined explosive is always more likely to be initiated than bare explosive, and the explosive initiation probability increases with the tube thickness and yield stress. The run to detonation generally increases with the increasing lateral confining strength, but decreasing jet tip velocity.
25
Yan, Qiushi, Chen Liu, Jun Wu, Jun Wu, and Tieshuan Zhuang. "Experimental and Numerical Investigation of Reinforced Concrete Pile Subjected to Near-Field Non-Contact Underwater Explosion." International Journal of Structural Stability and Dynamics 20, no. 06 (2020): 2040003. http://dx.doi.org/10.1142/s0219455420400039.
Full textAbstract:
High-pile wharf is an important port structure and may suffer from accidental explosions or terrorist bombing attack during the service life. The reinforced concrete (RC) pile is one of the popular vertical load-bearing piles of high-pile wharf structure. As a main load-bearing member of the high-pile wharf structure, the damage of RC pile due to underwater explosive may cause subsequently progressive collapse of the whole structure. In this paper, the dynamic response and failure mode of RC pile in high-pile wharf structure under the near-field non-contact underwater explosion are investigated using a combined experimental and numerical study. First, a typical RC pile was designed and tested for the near-field non-contact underwater explosion. The failure mode and damage of the RC pile specimen were obtained and analyzed. Second, the numerical model of the RC pile under near-field non-contact underwater explosion was established by adopting the commercial software AUTODYN, and then validated based on experimental results. It was shown that the results from numerical model and experimental test compared very well in terms of the damage pattern and lateral displacement. Furthermore, the full-scale numerical model of the RC pile for the near-field non-contact underwater explosion was developed based on the validated numerical model to investigate the damage pattern and failure mode of RC pile under varied underwater explosives. Lastly, the safety distance for the RC pile for the underwater explosion loading with consideration of different explosive mass, the explosive depth and the concrete strength was suggested. The outcome of this study presented reference for analysis, assessment and design of the type of RC pile for high-pile wharf structure subjected to near-field non-contact underwater explosion.
26
Monteiro, Luís Fernandes, Massuça, L. M. Massuça, L.M, García-García, JM García-García, JM, and Calvo-Rico, B. Calvo-Rico, B. "Differences of Explosive Strength in Judokas Medallists and Not Medallists." Paripex - Indian Journal Of Research 3, no. 5 (2012): 199–202. http://dx.doi.org/10.15373/22501991/may2014/61.
Full text
27
Castro jimenez, Laura Elizabeth, Angela Yazmin Galvez Pardo, Gustavo Andres Guzman Quintero, and Ana Isabel Garcia Muñoz. "Fuerza explosiva en adultas mayores, efectos del entrenamiento en fuerza máxima (Explosive strength in older adults, training effects on maximum strength)." Retos, no. 36 (January 12, 2019): 64–68. http://dx.doi.org/10.47197/retos.v36i36.66715.
Full textAbstract:
Introducción. En los adultos mayores existe una disminución de la fuerza muscular que es más significativa en mujeres que en los hombres. Objetivo. Conocer los cambios que en fuerza explosiva puedan generarse, posterior a la intervención con un programa de entrenamiento en fuerza máxima. Materiales y Métodos. Estudio cuasiexperimental con diseño pre-prueba y post-prueba, en una cohorte de adultas mayores quienes durante 12 semanas, recibieron entrenamiento en fuerza máxima, entre un 44% y un 54% de su RM. Los criterios de inclusión fueron, ser adultas mayores (≥60 años), con índice de masa corporal (IMC: 19-30 kg/m2), que asistieran al programa de actividad física para el adulto mayor, de la Universidad Santo Tomás en Bogotá (Colombia). Resultados. Se encontraron cambios en la fuerza explosiva con el entrenamiento, pero no son estadísticamente significativos, pero en cambio se encontraron cambios en la antropometría que si tienen una correlación significativa con la fuerza explosiva medida a través de SQJ. Conclusiones. Los resultados evidencian que es posible generar cambios en porcentajes de tejido graso a través de entrenamiento en fuerza y no exclusivamente en resistencia aeróbica y es necesario aumentar la muestra poblacional para reconocer con mayor claridad los cambios que se puedan generar en fuerza en el adulto mayor.Abstract. Introduction. In older adults there is a decrease in muscle strength that is more significant in women than in men. Objective. Assess the changes in explosive force that can be generated after an intervention with a training program on maximum force. Materials and methods. A quasi-experimental study with pre-test and post-test design, in a cohort of older adults who, during 12 weeks, received training on maximum strength, between 44% and 54% of their MRI. The inclusion criteria were to be older adults (≥60 years);to have a body mass index of 19-30 kg / m2); to attend the physical activity program for the elderly of the Santo Tomás University in Bogotá (Colombia). Results. We found changes in the explosive force after the training; however, they are not statistically significant. Changes were found in anthropometry, this showing significant correlation with explosive force measured through SQJ. Conclusions. The results show that it is possible to generate changes in percentages of fat tissue through strength training and not exclusively with aerobic resistance. Also, it is necessary to increase the sample size in order to recognize with greater clarity the changes that can be generated in strength in elderly.
28
Igor, Ilić, Durlević Slavka, Bubanj Saša, Bjelica Bojan, Aksović Nikola, and Dobrescu Tatiana. "Impact of Explosive Strength on Shot Speed in Handball." GYMNASIUM 24, no. 2 (2023): 109–19. http://dx.doi.org/10.29081/gsjesh.2023.24.2.07.
Full textAbstract:
Shooting is among the most important elements of the handball game that determine the success of the result. The aim of this research was to examine the impact of explosive strength on the shot speed of handball players. The sample of participants consisted of 20 handball players, aged 18 to 30 ± 0.3 years. The sample of measuring instruments consisted of five variables for evaluating explosive strength and four variables for evaluating shot speed in handball. The impact of explosive strength on shot speed in handball was determined using linear regression analysis. The results showed that the space of explosive strength is dominantly defined by the vertical jump test (VJ), while the latent space of shot speed is defined by the variable of jump shot with direct arm swing (SSD). Applying linear regression confirms that there is a statistically significant impact of explosive strength on shot speed in handball.
29
Dr.D.Maniazhagu, Kannadasan Mr., and Ms.S.Malar. "EFFECTS OF EXPLOSIVE STRENGTH AND STRENGTH ENDURANCE BASED CIRCUIT TRAINING ON SPEED PERFORMANCE." International Journal of Research - Granthaalayah 5, no. 8SE (2017): 76–82. https://doi.org/10.5281/zenodo.888019.
Full textAbstract:
The purpose of the study was to find out the effects of explosive strength and strength endurance based circuit training on speed performance. To achieve the purpose of the study, thirty boys’ student in the age group 13 to 14 were selected as subjects at random. The selected subjects were from RCM High School, Natarajapuram, Sivagangai(DT), Tamilnadu. The study was formulated as pre and post-test random group design, in which thirty students were divided into three equal groups. The experimental group-1 (n=10, ESbCT) underwent explosive strength based circuit training, the experimental group-2 (n=10, SEbCT) underwent strength endurance based circuit training and group 3 served as control group (n=10, CG) did not undergo any specific training. In this study, two training programme were adopted as independent variables, i.e., explosive strength based circuit training and strength endurance based circuit training. The speed was selected as dependent variables. The speed was tested by 50 meters run recoded in seconds. The selected two treatment group namely explosive strength based circuit training and strength endurance based circuit training were performed five days in week for the period of six weeks, as per the stipulated training programme. The speed performance was collected before and after the training period. The collected pre and post test data was critically analyzed with apt statistical tool of one way analysis of co variance, for observed the significant adjusted post-test mean difference of three groups. The Scheffe’s post hoc test was used to find out pair-wise comparisons between groups. To test the hypothesis 0.05 level of significant was fixed in this study. The nature of speed highly improved in explosive strength based circuit training than the strength endurance based circuit training.
30
Maniazhagu, D., Kannadasan, and S. Malar. "EFFECTS OF EXPLOSIVE STRENGTH AND STRENGTH ENDURANCE BASED CIRCUIT TRAINING ON SPEED PERFORMANCE." International Journal of Research -GRANTHAALAYAH 5, no. 8(SE) (2017): 76–82. http://dx.doi.org/10.29121/granthaalayah.v5.i8(se).2017.2251.
Full textAbstract:
The purpose of the study was to find out the effects of explosive strength and strength endurance based circuit training on speed performance. To achieve the purpose of the study, thirty boys’ student in the age group 13 to 14 were selected as subjects at random. The selected subjects were from RCM High School, Natarajapuram, Sivagangai(DT), Tamilnadu. The study was formulated as pre and post-test random group design, in which thirty students were divided into three equal groups. The experimental group-1 (n=10, ESbCT) underwent explosive strength based circuit training, the experimental group-2 (n=10, SEbCT) underwent strength endurance based circuit training and group 3 served as control group (n=10, CG) did not undergo any specific training. In this study, two training programme were adopted as independent variables, i.e., explosive strength based circuit training and strength endurance based circuit training. The speed was selected as dependent variables. The speed was tested by 50 meters run recoded in seconds. The selected two treatment group namely explosive strength based circuit training and strength endurance based circuit training were performed five days in week for the period of six weeks, as per the stipulated training programme. The speed performance was collected before and after the training period. The collected pre and post test data was critically analyzed with apt statistical tool of one way analysis of co variance, for observed the significant adjusted post-test mean difference of three groups. The Scheffe’s post hoc test was used to find out pair-wise comparisons between groups. To test the hypothesis 0.05 level of significant was fixed in this study. The nature of speed highly improved in explosive strength based circuit training than the strength endurance based circuit training.
31
Xie, Zhi Ying, Ji Ke Tan, Hui Yang, and Jin Yu Pan. "Research on the Characteristics of Steel Frame Node under Explosive and Impact Load." Advanced Materials Research 779-780 (September 2013): 1188–93. http://dx.doi.org/10.4028/www.scientific.net/amr.779-780.1188.
Full textAbstract:
With the characteristics of huge energy,short acting time and large destructiveness, Explosive and Impact Load leads a large punching force towards construction units. Once happened, it can cause serious of damaging effects. Therefore,the explosion protection performance of construction is being more and more concerned[1].The large finite element analysis software ABAQUS is being used to deal with numerical simulation of cross steel frame node, to analyses the response of the steel frame node and to discusses different steel material parameters on the influence of the nodes dynamic response under the effect of Explosive and Impact Load in this paper. According to conclusions, increase strength and modulus of elasticity of steel can reduce the damage of Explosive and Impact Load to construction. Meanwhile taking advantage of the function of transferring information between explicit processor and standard processor in ABAQUS, this paper analyses the effect of Explosive and Impact Load on steel frame node under low cyclic loading and concludes that it is harmful to the structural performance that the effect of Explosive and Impact Load can lower the ductility of the structure. According to the conclusion from the research on steel frame nodes characteristics under the effect of Explosive and Impact Load, this paper present that negative influence of Explosive and Impact Load should be taken fully into account, beneficial materials to explosion protection performance should be choosen and the corresponding measures to improve the ductility of structure should be taken to reduce structures degree of damage under Explosive and Impact Load in future structural design. All the research have a certain significance to the future structural design of explosion protection.
32
Yadav, Pramod Kumar, and Santosh Kumar Gupta. "The Impact of Explosive Strength Training on Long Jump and Triple Jump Performance: A Pre-Post Intervention Study." International Journal of Physical Education & Sports Sciences 20, no. 1 (2025): 1–12. https://doi.org/10.29070/aehraq78.
Full textAbstract:
This study investigated the effect of a special explosive strength training plan on the performance and physical capacities of long jump and triple jump athletes. Forty participants underwent pre- and post-training assessments measuring jump distances alongside leg, hand, and abdominal explosive strength. Descriptive statistics revealed marked improvements across all variables following the intervention. Paired t-test analyses confirmed these gains were statistically significant (p < .001) for both jump performance and explosive strength measures. Repeated measures ANOVA further demonstrated significant differences among the types of explosive strength components pre- and post-training (p < .00001), highlighting their distinct contributions to jump performance. The findings emphasize that leg, hand, and abdominal explosiveness each uniquely influence jump outcomes and respond differently to training stimuli. This study underscores the effectiveness of a multifaceted explosive strength regimen in enhancing athletic performance in horizontal jump events. Recommendations include individualized training protocols targeting specific strength deficits and integrating technique work to optimize results. These insights provide valuable guidance for coaches and practitioners aiming to maximize jump performance through evidence-based strength development strategies.
33
Maden-Wilkinson, T. M., T. G. Balshaw, G. J. Massey, and J. P. Folland. "Muscle architecture and morphology as determinants of explosive strength." European Journal of Applied Physiology 121, no. 4 (2021): 1099–110. http://dx.doi.org/10.1007/s00421-020-04585-1.
Full textAbstract:
Abstract Purpose Neural drive and contractile properties are well-defined physiological determinants of explosive strength, the influence of muscle architecture and related morphology on explosive strength is poorly understood. The aim of this study was to examine the relationships between Quadriceps muscle architecture (pennation angle [ΘP] and fascicle length [FL]) and size (e.g., volume; QVOL), as well as patellar tendon moment arm (PTMA) with voluntary and evoked explosive knee extension torque in 53 recreationally active young men. Method Following familiarisation, explosive voluntary torque at 50 ms intervals from torque onset (T50, T100, T150), evoked octet at 50 ms (8 pulses at 300-Hz; evoked T50), as well as maximum voluntary torque, were assessed on two occasions with isometric dynamometry. B-mode ultrasound was used to assess ΘP and FL at ten sites throughout the quadriceps (2–3 sites) per constituent muscle. Muscle size (QVOL) and PTMA were quantified using 1.5 T MRI. Result There were no relationships with absolute early phase explosive voluntary torque (≤ 50 ms), but θP (weak), QVOL (moderate to strong) and PTMA (weak) were related to late phase explosive voluntary torque (≥ 100 ms). Regression analysis revealed only QVOL was an independent variable contributing to the variance in T100 (34%) and T150 (54%). Evoked T50 was also related to QVOL and θP. When explosive strength was expressed relative to MVT there were no relationships observed. Conclusion It is likely that the weak associations of θP and PTMA with late phase explosive voluntary torque was via their association with MVT/QVOL rather than as a direct determinant.
34
Xia, Zhiqun, Haitao Wang, Changgen Shi, Zerui Sun, Qiang Wang, and Xvchuan Luo. "Analysis and Characterization of Three Charge Thicknesses in TA1/Al1060/Al7075 Explosive Welding Composite Process." Crystals 13, no. 7 (2023): 1079. http://dx.doi.org/10.3390/cryst13071079.
Full textAbstract:
The titanium/aluminum composite materials overcome the limitations of single metal materials and achieve lightweight, high-strength, and corrosion-resistant properties. However, there have been no reports on explosion-welded composites of titanium alloys and seven-series aluminum alloys. Therefore, TA1/Al1060/Al7075 explosion-welded plates with three different explosive thicknesses were successfully prepared using Al1060 as the transition layer. The SPH-FEM coupled algorithm was employed to analyze the detonation process in detail and predict the interface under different explosive thicknesses. The results showed that during the explosion welding process, the high temperature, pressure, and high-speed impact resulted in significant plastic deformation and jetting phenomena at the bonding interface, which were in good agreement with the experimental observations. With the increase in explosive thickness, the TA1/Al1060 bonding interface exhibited a flat shape, while the Al1060/Al7075 interface transitioned from a flat to a wavy morphology. Moreover, the crack, vortex, and TiAl3 were observed at the interface. Mechanical testing results revealed that the composite plate with a 35 mm explosive thickness exhibited the best tensile, shear, and bending performance, indicating the optimal process parameter. This study provides significant support and reference for the application of explosion welding technology in titanium alloys and seven-series aluminum alloy composite materials.
35
Alexandru, Oprean, Puni Alexandru-Rares, Ungurean Bogdan-Constantin, and Cojocariu Adrian. "Explosive strength evolution of Romanian professional rugby players – Backs." New Trends and Issues Proceedings on Humanities and Social Sciences 8, no. 3 (2021): 37–43. http://dx.doi.org/10.18844/prosoc.v8i2.6159.
Full textAbstract:
The purpose of this study is to highlight the evolution of the explosive strength in the 4-year interval of the backs compartment and the level of adaptation to the game requirements. The hypothesis in this study is that the explosive strength of the lower limbs in rugby backs developed during the past 4 years, trying to keep up with the higher needs in the first Romanian league. Explosive power was measured using the ‘Just Jump System’, which is a plyometric test mat on which the players conducted a set of three tests: squat jump, control movement jump and free jump. The forwards significantly improved their explosive strength in a 4-year period. Although the total body mass got bigger, the players managed to improve their lower limbs’ explosive strength; this fact proves a good physical adaptation to the requirements of the rugby game.
 
 Keywords: Power, jump.
36
Utamayasa, I. Gede Dharma, Hari Setijono, and Oce Wiriawan. "The Effect of Plyometric Exercise towards Agility, Speed, Strength and Explosive Power of Leg Muscle." Sport i Turystyka. Środkowoeuropejskie Czasopismo Naukowe 3, no. 3 (2020): 81–88. http://dx.doi.org/10.16926/sit.2020.03.22.
Full textAbstract:
The aim of this research is to investigate the effect of hurdle box drill with the stick, jump and speed hurdle lateral, and lateral hurdle jump exercises on agility, speed, strength, and explosive power of leg muscles. The sample group of the study consisted of 33 students who participated in badminton FIO UNESA. The methodology used was quantitative research with quasi-experimental methods. The result showed that group I had enhancement on the muscular strength of the limbs for 2.89, speed for −0.003, agility 0.1 and leg muscle explosive power for 1.42. Group II had the strength of the lower limbs for −1.04, speed 0.09, agility −0.19 and leg muscle explosive power 0.85 and group III had limbs muscle strength increased for 0.43, speed 1.18, agility 0.36 and leg muscle explosive power 0.71. Therefore, it can be concluded that these three exercises affected the agility, speed, strength and explosive power of leg muscle.
37
Gałka, A., and M. Najwer. "Explosive Cladding of Titanium and Aluminium Alloys on the Example of Ti6Al4V-AA2519 Joints / Wybuchowe Platerowanie Stopów Tytanu I Aluminium Na Przykładzie Połączenia Ti6Al4V-AA2519." Archives of Metallurgy and Materials 60, no. 4 (2015): 2985–92. http://dx.doi.org/10.1515/amm-2015-0477.
Full textAbstract:
Explosive cladding is currently one of the basic technologies of joining metals and their alloys. It enables manufacturing of the widest range of joints and in many cases there is no alternative solution. An example of such materials are clads that include light metals such as titanium and aluminum. ach new material combination requires an appropriate adaptation of the technology by choosing adequate explosives and tuning other cladding parameters. Technology enabling explosive cladding of Ti6Al4V titanium alloy and aluminum AA2519 was developed. The clads were tested by means of destructive and nondestructive testing, analyzing integrity, strength and quality of the obtained joint.
38
Saha, Gopa. "A Comparative Study on Explosive Strength and Reaction ability between Female Kabaddi and Kho Kho Players." Journal of Advances in Sports and Physical Education 5, no. 6 (2022): 123–28. http://dx.doi.org/10.36348/jaspe.2022.v05i06.003.
Full textAbstract:
Background: Competitive game requires high level of skill related fitness including reaction time and explosive strength in kabaddi and kho-kho games to perform frequently higher level of performance. Objective: The purpose of the study is to find out the difference of explosive strength and reaction ability between junior level female kabaddi and kho kho players. Method: Fifty junior level female kabaddi players and fifty kho kho players were requited in this study from different sports club in West Bengal. The age of the subjects ranged between 14 to 16 years. Explosive strength and reaction ability was considered as variables and which was measured by standing broad jump and nelson hand reaction test respectively. Result: The obtained results show that significant difference found in explosive strength (p=0.05) and reaction ability (p=0.03) between female kabaddi and kho kho players. It is also found that the explosive strength (1.67±0.17) and reaction ability (3.28±1.49) of the kho kho players are higher in comparison to kabaddi players (1.56±0.12 and 5.19±1.74). Conclusion: It is concluded that there are significant differences found in explosive strength and reaction ability between female kabaddi and kho kho players. It is also found that kho kho players have a better leg strength and reaction ability in contrast to kabaddi players.
39
Pfeifle, Jonas, David Hasler, and Nicola A. Maffiuletti. "Should We Use Unilateral or Bilateral Tasks to Assess Maximal and Explosive Knee Extensor Strength in Patients with Knee Osteoarthritis? A Cross-Sectional Study." Journal of Clinical Medicine 10, no. 19 (2021): 4353. http://dx.doi.org/10.3390/jcm10194353.
Full textAbstract:
Deficits in maximal and explosive knee extensor strength, which are usually assessed with unilateral tasks, are substantial in patients with knee osteoarthritis (KOA). The aim of this study was to investigate the clinical relevance of unilateral vs. bilateral tasks for assessing knee extensor strength in patients with KOA. This was achieved primarily by comparing unilateral and bilateral inter-limb strength asymmetries and secondarily by examining the relationship between unilaterally and bilaterally measured strength, and performance-based and self-reported function. Twenty-four patients with unilateral KOA (mean age: 65 ± 7 years) performed isometric gradual and explosive maximal voluntary contractions to assess, respectively their maximal and explosive strength. Performance-based and self-reported function were also evaluated with standard functional tests and questionnaires, respectively. Inter-limb asymmetries of maximal and explosive strength did not differ significantly between unilateral (mean asymmetry: 26 ± 15%) and bilateral tasks (22 ± 21%). In the same way, the relationships between knee extensor strength—measured either unilaterally or bilaterally—and performance-based or self-reported function were not influenced by the type of task. In conclusion, it does not seem to make a difference in terms of clinical relevance whether maximal and explosive knee extensor strength are evaluated with unilateral or bilateral tasks in KOA patients.
40
Dotto, Magreth S., and Yashar Pourrahimian. "The Influence of Explosive and Rock Mass Properties on Blast Damage in a Single-Hole Blasting." Mining 4, no. 1 (2024): 168–88. http://dx.doi.org/10.3390/mining4010011.
Full textAbstract:
In rock blasting for mining production, stress waves play a major role in rock fracturing, along with explosive gases. Better energy distribution improves fragmentation and safety, lowers production costs, increases productivity, and controls ore losses and dilution. Blast outcomes vary significantly depending on the choice of the explosive and the properties of the rock mass encountered. This study analyzes the effects of rock mass and explosive properties on blast outcomes via numerical simulation using data from the case study, and later validates the simulation results from the field blast fragmentation. The findings suggest that, for a given set of rock properties, the choice of explosive has a major influence on the resulting fragmentation. Strong explosives (high VOD and detonation pressure) favor large fracture extents in hard rocks, while weaker explosives offer a better distribution of explosive energy and fractures. The presence of rock structures such as rock contacts and joints influences the propagation of stress waves and fractures depending on the structures’ material properties, the intensity and orientations, and the direction and strength of the stress wave. When the stress wave encounters a contact depending on its direction, it is enhanced when traveling from soft to hard and attenuates in the opposite direction. The ability of the stress wave to cause fracturing on the opposite side of the contact depends on the intensity of the transmitted wave and the strength of the rock. Transmitted wave intensity is a function of the strength of the incident wave and the impedance difference between the interface materials. The presence of joints in the rock mass affects the propagation of the stress wave, mainly depending on the infill material properties and the angle at which the stress wave approaches the joint. Less compressible, higher stiffness joints transmit more energy. More energy is also transmitted in the areas where the stress wave hits the joint perpendicularly. Joints parallel to the free face offer additional fracturing on the opposite side of the joint. Other parameters, such as the joint width, continuity, fracture frequency, and the distance from the charge, enhance the effects. To achieve effective fragmentation, the blast design should mitigate the effect of variability in the rock mass via explosive selection and pattern design to ensure adequate energy distribution within the limits of geometric design.
41
Beunen, Gaston, Martine Thomis, Maarten Peeters, Hermine H. Maes, Albrecht L. Claessens, and Robert Vlietinck. "Genetics of Strength and Power Characteristics in Children and Adolescents." Pediatric Exercise Science 15, no. 2 (2003): 128–38. http://dx.doi.org/10.1123/pes.15.2.128.
Full textAbstract:
The aim of this study is to quantify the genetic and environmental variation in isometric and explosive strength (power) in children and adolescents, using structural equation models. Arm pull (static strength) and vertical jump (explosive strength, power) were measured in 105 twin pairs from the Leuven Longitudinal Twin Study. Boys and girls were tested at annual intervals between 10 and 16 years and at 18 years. Path models were fitted to the observed strength characteristics and a gender heterogeneity analysis was performed at each age level. A model including additive genetic and specific environmental factors (AE-model) allowing for a difference in total phenotypic variance or in genetic/environmental variance components in boys and girls best explains both strength characteristics at most age levels. The additive genetic contribution for isometric strength varies between a2 = .44 and a2 = .83, and for explosive strength between a2 = .47 and a2 = .92, except at 16 years in males. In conclusion there is good evidence that during the growth period both static and explosive strength are under moderate to moderately strong genetic influence.
42
Parmadi, Mokhamad, Sekar Ayu Wigunani, Agus Setia Budi, Wisnu Murtiansyah, and Ari Susanto. "Correlation between Limb Muscle Exploitative Strength to Futsal Shooting Ability." JUMORA: Jurnal Moderasi Olahraga 2, no. 2 (2022): 148–60. http://dx.doi.org/10.53863/mor.v2i2.533.
Full textAbstract:
This study aims to determine the relationship between the explosive power of leg muscles and the ability to shoot futsal. This research is a quantitative study with a correlational type. The sample in this study was 30 members of the Ababil futsal club. The instrument used in this study is a test of limb muscle exploitative strength and futsal shooting ability. The analysis techniques used are quantified statistics accompanied by hypothesis testing. Conclusions from the research findings are that there is a very meaningful relationship between the explosive power of the limb muscles and the shooting ability. Supporting data in addition to correlation, also found that the average explosive power of the player's limb muscles is 80, which reduces the average obtained player at the time of the ability test shooting in futsal games is 7.4. The results of this study have implications for paying special attention to athletes, especially the explosive power of the leg muscles because they contribute to the ability to shoot futsal. Special attention can be the program Exercises for the increased explosive power of limb muscles varied in certain Exercises. It is recommended for coaches and futsal coaches to pay attention to the elements of the explosive power of limb muscles in improving the ability to shoot in the game of futsal. It is expected in other studies to be able to see several other factors that have not been considered in this study. Keywords: leg muscle, explosive power, shooting, futsal
43
KUZ'MIN, E. V., M. P. KOROLEV, V. I. LYSAK, et al. "INVESTIGATION OF THE EFFECT OF ULTRASOUND ON THE FORMATION OF THE STRUCTURE AND PROPERTIES OF ALUMINUM-STEEL JOINTS DURING EXPLOSION WELDING IN FORCED COLLISION MODES." IZVESTIA VOLGOGRAD STATE TECHNICAL UNIVERSITY, no. 11 (282) (November 2023): 32–41. http://dx.doi.org/10.35211/1990-5297-2023-11-282-32-41.
Full textAbstract:
The work is devoted to the study of the effect of the introduction of ultrasonic vibrations during explosion welding of a pair of aluminum-steel compounds. A comparative study of the effect of the explosive loading scheme of joints obtained by the conventional method of explosion welding and explosion welding with the influence of ultrasonic vibrations in forced welding modes was carried out. It has been experimentally established that the introduction of additional ultrasound energy in the process of explosive loading of an aluminum-steel compound contributes to a significant reduction in the amount of molten metal at the junction boundary throughout the studied range. The chemical composition of the areas of the melted metal is considered. The results of the tensile strength of aluminum+steel composite layers are presented.
44
Kilincarslan, Gökmen, Ismail Ilbak, Kenan Balyamez, and Bedrettin Dolanbay. "Acute Effects of Postactivation Potantiation on Explosive Strength Performance in Fitness Athletes." Pakistan Journal of Medical and Health Sciences 16, no. 2 (2022): 470–73. http://dx.doi.org/10.53350/pjmhs22162470.
Full textAbstract:
Aim: The aim of this research is to examine the effects of postactivation potantiation (PAP) on explosive strength performance in terms of the rest period and also to determine the optimal resting time for generating explosive strength after the PAP protocol. Methods: Ten fitness athletes were recruited for this study. The mean age of the participants group of the research was 26.60±1.07, their height was 178.50±3.02, their weight was 80.00±4.49, their maximal squat repetition performance (1-RM) was 130±7.45, their vertical jump performance was 53.80±1.98 and their explosive strength performance was 14.50±.47. In this research, measurements were completed on five seperate days with 72 hours intervals. On the first measurement day, the athletes' height and weight measurements, 1-RM squat measurements, vertical jump performance measurements were taken and explosive strength levels were calculated using the Lewis formula. On the second measurement day, 5 repetitions were performed with 85% of the 1-RM squat and after 15 seconds of rest, the vertical jump performance test was measured. On the third measurement day, 5 repetitions of 1-RM squats with 85% were performed and after 3 minutes of rest, the vertical jump performance test was measured. On the fourth measurement day, 5 repetitions of 1-RM squat with 85% were performed and after a rest period of 6 minutes, the vertical jump performance test was measured. Finally, on the fifth measurement day, 5 repetitions of 1-RM squats with 85% were performed and after 9 minutes of rest, the vertical jump performance test was measured. After all measurements, explosive strength levels were calculated using Lewis formula. Passive rest was performed between the exercise and the measurement. Results: It was determined that explosive strength performance was negatively affected 15 seconds after the loading applied within the scope of the PAP protocol, and the difference between the pre-test and the post-test was statistically significant. Bat it was determined that there was no statistical difference between the pre-test and post-test in explosive strength performance 3 minutes after the loads applied within the scope of the PAP protocol. But also it was observed that the explosive strength performance was positively affected 6 minutes after the loading applied within the scope of the PAP protocol, and the difference between the pre-test and the post-test was statistically significant. Finally, it was determined that there was no statistical difference between the pre-test and post-test in explosive strength performance 9 minutes after the loading applied within the scope of the PAP protocol. Conclusion: As a result of this research, it has been determined that the optimal resting time for explosive strength generation is 6 minutes after the loading applied within the scope of the PAP protocol. In addition, it was determined that explosive strength performance was negatively affected after a short rest period of 15 seconds after the loading applied within the scope of the PAP protocol. In this context, it can be said that optimum performance can occur when fatigue is greatly reduced but the PAP effect is still present. Keywords: Postactivation Potantiation, Explosive Strength Performance, Complex Training
45
Corigliano, Pasqualino. "Non-linear finite element analysis of a Ti6Al4V/Inconel 625 joint obtained by explosion welding for sub-sea applications." Underwater Technology 38, no. 1 (2021): 13–16. http://dx.doi.org/10.3723/ut.38.013.
Full textAbstract:
Industries have shown interest in the use of dissimilar metals to make corrosion-resistant materials combined with good mechanical properties in marine environments. Explosive welding can be considered a good method for joining dissimilar materials to prevent galvanic corrosion. The aim of the present study was to simulate the non-linear behaviour of a Ti6Al4V/Inconel 625 welded joint obtained by explosion welding from the values of the tensile ultimate strength and yielding strength of the parent materials. The present study compared the stress-strain curve from tensile loading obtained by the non-linear finite element analysis with the experimental stress-strain curve of a bimetallic joint. The applied method provides useful information for the development of models and the prediction of the structural behaviour of Ti6Al4V/Inconel 625 explosive welded joints.
46
Stoycheva, Nadezhda, and Petar Shishkov. "NON-DETONATING CHARGES IN POLYMER HOUSINGS FOR SMOOTH SPLITTING OF ROCK BLOCKS DURING PRIMARY EXTRACTION AND SECONDARY CUTTING." SUSTAINABLE EXTRACTION AND PROCESSING OF RAW MATERIALS JOURNAL 1, no. 1 (2020): 85–89. http://dx.doi.org/10.58903/a14161835.
Full textAbstract:
In some cases, during the extraction of certain mineral resources, industrial explosives are not sufficiently safe for the environment in terms of generated shock waves, toxic gases, seismic waves, scattering and vibrations. The main reasons for these harmful effects of the explosion are the speed and the mechanism of the chemical reaction of explosive decomposition. The authors have focused their research on a variety of fast-combusting high-energetic compositions, that can fully replace the widely used detonating explosives in the extraction and secondary processing (cutting) of large stone blocks. Samples from polymer containers filled with non-detonating compositions, based on waste gunpowder and metal-containing pyrotechnic mixtures were subjected to field tests. The experiments were performed in real conditions on stone blocks with hardness f = 16 according to the Protodyakonov rock strength scale. Depending on the lengths of the blast holes, different charge designs were used.
47
Nadezhda, Stoycheva, and Shishkov Petar. "NON-DETONATING CHARGES IN POLYMER HOUSINGS FOR SMOOTH SPLITTING OF ROCK BLOCKS DURING PRIMARY EXTRACTION AND SECONDARY CUTTING." SUSTAINABLE EXTRACTION AND PROCESSING OF RAW MATERIALS JOURNAL 1/2020, no. 1/2020 (2020): 93. https://doi.org/10.5281/zenodo.4270146.
Full textAbstract:
In some cases, during the extraction of certain mineral resources, industrial explosives are not sufficiently safe for the environment in terms of generated shock waves, toxic gases, seismic waves, scattering and vibrations. The main reasons for these harmful effects of the explosion are the speed and the mechanism of the chemical reaction of explosive decomposition. The authors have focused their research on a variety of fast-combusting high-energetic compositions, that can fully replace the widely used detonating explosives in the extraction and secondary processing (cutting) of large stone blocks. Samples from polymer containers filled with non-detonating compositions, based on waste gunpowder and metal-containing pyrotechnic mixtures were subjected to field tests. The experiments were performed in real conditions on stone blocks with hardness f = 16 according to the Protodyakonov rock strength scale. Depending on the lengths of the blast holes, different charge designs were used.
48
Ojeda-Aravena, Alex Patricio, Jairo Azócar-Gallardo, Claudio Hérnandez-Mosqueira, and Tomás Herrera-Valenzuela. "Relación entre la prueba de agilidad específica en taekwondo (tsat), la fuerza explosiva y la velocidad líneal en 5-m atletas de taekwondo de ambos sexos (Relationship between the specific agility test in taekwondo (tsat), explosive strength and 5-m linea." Retos, no. 39 (May 20, 2020): 84–89. http://dx.doi.org/10.47197/retos.v0i39.78395.
Full textAbstract:
El taekwondo (TKD) es caracterizado como un deporte intermitente y de alta-intensidad donde predominan la ejecución de movimientos rápidos y explosivos, con desplazamientos continuos y cambios de dirección (COD). Objetivo. El propósito de este estudio fue examinar la asociación entre la prueba TSAT y la fuerza explosiva y la velocidad lineal en 5-M en competidores de TKD de nivel nacional de ambos sexos. Material y métodos. A través de un diseño correlacional 14 competidores de ambos sexos que compiten habitualmente en torneos de nivel regional y nacional, (edad 19 ± 3 años; talla 164 ± 10 cm; peso corporal 62 ± 10 kg; experiencia 7.2 ± 2.9 años) participaron en este estudio. Como indicadores de fuerza explosiva se evaluó squat jump (SJ) y countermovement jump (CMJ), además de la velocidad lineal en 5-m (5-M) y la prueba de agilidad específica en taekwondo (TSAT) Resultados. Entre los principales hallazgos de este estudio se documentó una relación directa (r = .70) entre 5-M y TSAT; una relación inversa (r = -.63) entre SJ; CMJ (r = -.53) y TSAT respectivamente. Conclusiones. Nuestros datos muestran que la prueba de TSAT se relaciona con la velocidad lineal en 5-m y la fuerza explosiva. Los entrenadores deberían considerar el entrenamiento de estas cualidades, utilizando ejercicios similares para desarrollar la agilidad en competidores de TKD.
 Abstract. Taekwondo (TKD) is characterized as an intermittent and high-intensity sport in which predominates the execution of fast and explosive movements, with continuous movements and changes of direction (COD). Objective. The purpose of this study was to examine the association between the TSAT test, explosive strength, and 5-M line speed in national level TKD competitors of both sexes. Material and method. Through a correlational design, 14 competitors of both sexes who regularly compete in regional and national tournaments (age 19 ± 3 years; size 164 ± 10 cm; body weight 62 ± 10 kg; experience 7.2 ± 2.9 years), participated in this study. As indicators of explosive strength, squat jump (SJ) and countermovement jump (CMJ) were evaluated, as well as the 5-m linear speed (5-M) and the taekwondo-specific agility test (TSAT). Results. Among the main findings of this study, a direct relationship (r = .70) between 5-M and TSAT and an inverse relationship (r = -.63) between SJ, CMJ (r = -.53), and TSAT were documented, respectively. Conclusions. Our data shows that the TSAT test is related to 5-m linear velocity and explosive force. Coaches should consider training these qualities, using similar exercises to develop agility in TKD competitors.
49
Beattie, Kris, Brian P. Carson, Mark Lyons, and Ian C. Kenny. "The Effect of Maximal- and Explosive-Strength Training on Performance Indicators in Cyclists." International Journal of Sports Physiology and Performance 12, no. 4 (2017): 470–80. http://dx.doi.org/10.1123/ijspp.2016-0015.
Full textAbstract:
Cycling economy (CE), power output at maximal oxygen uptake (WV̇O2max), and anaerobic function (ie, sprinting ability) are considered the best physiological performance indicators in elite road cyclists. In addition to cardiovascular function, these physiological indicators are partly dictated by neuromuscular factors. One technique to improve neuromuscular function in athletes is through strength training. The aim of this study was to investigate the effect of a 20-wk maximal- and explosive-strength-training intervention on strength (maximal strength, explosive strength, and bike-specific explosive strength), WV̇O2max, CE, and body composition (body mass, fat and lean mass) in cyclists. Fifteen competitive road cyclists were divided into an intervention group (endurance training and strength training: n = 6; age, 38.0 ± 10.2 y; weight, 69.1 ± 3.6 kg; height, 1.77 ± 0.04 m) and a control group (endurance training only: n = 9; age, 34.8 ± 8.5 y; weight, 72.5 ± 7.2 kg; height, 1.78 ± 0.05 m). The intervention group strength-trained for 20 wk. Each participant completed 3 assessments: physiology (CE, WV̇O2max, power at 2 and 4 mmol/L blood lactate), strength (isometric midthigh pull, squat-jump height, and 6-s bike-sprint peak power), and body composition (body mass, fat mass, overall leanness, and leg leanness). The results showed significant between- and within-group changes in the intervention group for maximal strength, bike-specific explosive strength, absolute WV̇O2max, body mass, overall leanness, and leg leanness at wk 20 (P < .05). The control group showed no significant within-group changes in measures of strength, physiology, or body composition. This study demonstrates that 20 wk of strength training can significantly improve maximal strength, bike-specific explosive strength, and absolute WV̇O2max in competitive road cyclists.
50
Chen, Siyuan. "Model Test Study on the Transmission Law of Explosion Stress Wave in Rock Mass with Filling Joints." Frontiers in Science and Engineering 3, no. 2 (2023): 11–20. http://dx.doi.org/10.54691/fse.v3i2.3662.
Full textAbstract:
In order to study the propagation and attenuation law of explosive stress wave in rock mass with filling joints, and consider the influence of different crustal stress conditions, different strength mortar is used to simulate rock mass and joints, and the multi-functional simulation test device of geotechnical engineering is used to carry out explosive model test research, the influence characteristics of different in-situ stress conditions on the attenuation of explosive stress wave in rock mass with different thickness filling joints are analyzed, and obtain the transmission law of stress wave. The results show that: when the explosion stress wave propagates in the joined rock mass, the thicker the filling joint is, the greater the attenuation range of the stress wave energy and the samller the transmission coefficient; In-situ stress will change the attenuation of explosive stress wave in rock mass. With the increase of in-situ stress, the transmission coefficient of stress wave in intact rock mass and joined rock mass will increase. When the local stress is fixed, the transmission coefficient of stress wave in joined rock mass also increase gradually with the increase of explosion load.