Academic literature on the topic 'Impact tensile loading'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Impact tensile loading.'
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.
Journal articles on the topic "Impact tensile loading"
1
Gan, Xuehui, Jianhua Yan, Bohong Gu, and Baozhong Sun. "Impact tensile behavior and frequency response of 3D braided composites." Textile Research Journal 82, no. 3 (2011): 280–87. http://dx.doi.org/10.1177/0040517511427970.
Full textAbstract:
The uniaxial tensile properties of 4-step 3D braided E-glass/epoxy composites under quasi-static and high-strain rate loadings have been investigated to evaluate the tensile failure mode at different strain rates. The uniaxial tensile properties at high strain rates from 800/s to 2100/s were tested using the split Hopkinson tension bar (SHTB) technique. The tensile properties at quasi-static strain rate were also tested and compared with those in high strain rates. Z-transform theory is applied to 3D braided composites to characterize the system dynamic behaviors in frequency domain. The frequency responses and the stability of 3D braided composites under quasi-static and high-strain rate compression have been analyzed and discussed in the Z-transform domain. The results indicate that the stress-strain curves are rate sensitive, and tensile modulus, maximum tensile stress and corresponding tensile strain are also sensitive to the strain rate. The tensile modulus, maximum tensile stress of the 3D braided composites are linearly increased with the strain rate. With increasing of the strain rate (from 0.001/s to 2100/s), the tensile failure of the 3D braided composite specimens has a tendency of transition from ductile failure to brittle failure. The magnitude response and phase response is very different in quasi-static loading with that in high-strain rate loading. The 3D braided composite system is more stable at high strain rate than quasi-static loading.
2
Wang, Huanran, Canyuan Cai, Danian Chen, and Dongfang Ma. "Dynamic Constitutive Behavior and Fracture of Lanthanum Metal Subjected to Impact Compression at Different Temperatures and Impact Tension." International Journal of Nonlinear Sciences and Numerical Simulation 14, no. 1 (2013): 15–26. http://dx.doi.org/10.1515/ijnsns-2011-0191.
Full textAbstract:
Abstract Based on compressive tests, static on 810 material test system (MTS) and dynamic on the first compressive loading in split Hopkinson pressure bar (SHPB) tests at different strain rates and temperatures for Lanthanum (La) cylinder specimens, this study determined Johnson-Cook (J-C) type compressive constitutive equation of La metal. The determined compressive constitutive equation of La metal was calibrated in numerically simulating the recorded large deformations of La cylinder specimens generated by the multi-compressive loadings in SHPB tests. Based on tensile tests, static on MTS and dynamic on the first tensile loading in optimized tensile split Hopkinson bar (TSHB) tests at different strain rates for La sheet specimens, this study determined the J-C type tensile constitutive equation of La metal. It was found that the La sheet specimens were fractured during the first tensile loading in TSHB tests. The numerical simulations of transmitted and reflected pulses of TSHB tests for La sheet specimens using strain rate dependent failure strain criterion were consistent with the experimental data. The relation between dynamic failure strength and strain rates was discussed. From scanning electron microscope investigation of fractured La specimens, it was found that damage evolution patterns at high loading rates tend to become regular.
3
Li, Shengwei, Cunbao Li, Wei Yao, et al. "Impact of wetting-drying cycles on dynamic tensile strength of rock." Thermal Science 23, Suppl. 3 (2019): 815–20. http://dx.doi.org/10.2298/tsci180411115l.
Full textAbstract:
To study the effect of wetting-drying cycles on dynamic tensile strength of rock, dynamic indirect tension test of sandstone samples after 0, 1, 3, and 5 wetting-drying cycles was conducted. Tensile failure was observed by digital image correlation. The result shows that failure appears in the center of the samples initially, consistent with tensile strain field results obtained by digital image correlation. An empirical formula was derived to link loading rate and dynamic tensile strength of rock after wetting-drying cycles. As the loading rate increases, tensile strength increases significantly. Tensile strength reduces as the number of wetting-drying cycles increases. These results provide reference data for complex engineering problems such as those that occur in coal mining, tunneling and water conservancy.
4
Yokoyama, T. "Experimental determination of impact tensile properties of adhesive butt joints with the split Hopkinson bar." Journal of Strain Analysis for Engineering Design 38, no. 3 (2003): 233–45. http://dx.doi.org/10.1243/030932403765310563.
Full textAbstract:
The tensile strength and energy absorption of adhesive butt joints at high rates of loading are determined with a tensile split Hopkinson bar using a cylindrical specimen. A commercially available single-component cyanoacrylate adhesive (instantaneous adhesive) and two different adherend materials are used in the adhesion tests. The impact tensile strength of the cyanoacrylate adhesive butt joints is determined from the applied tensile stress history at failure initiation. The impact absorbed energy is obtained by numerical integration of dynamic tensile load-adhesive deformation data. Comparative tension tests at low and intermediate rates of loading are performed on an Instron testing machine. An axisymmetric finite element analysis is carried out to investigate the stress distributions in the adhesive layer of the cyanoacrylate adhesive butt joints. The effects of loading rate, adherend material and adhesive layer thickness on the tensile strength and energy absorption of the cyanoacrylate adhesive butt joints are examined in detail. It is shown that the joint tensile strength increases significantly with increasing loading rate and is greatly affected by both the adhesive layer thickness and the adherend materials. The limitations of the technique are discussed.
5
Peng, Yucheng, Munkaila Musah, Brian Via, and Xueqi Wang. "Calcium Carbonate Particles Filled Homopolymer Polypropylene at Different Loading Levels: Mechanical Properties Characterization and Materials Failure Analysis." Journal of Composites Science 5, no. 11 (2021): 302. http://dx.doi.org/10.3390/jcs5110302.
Full textAbstract:
Calcium carbonate (CaCO3) particles have been widely used in filling thermoplastics for different applications in automotive, packaging, and construction. No agreement has been reached in the research community regarding the function of CaCO3 for enhancing toughness of homopolymer polypropylene (HPP). This study was to understand the effect of different loading levels of CaCO3 on HPP toughness, including notched and unnotched impact strength. A batch mixer was used to thermally compound CaCO3 particles with HPP at loading levels of 10, 20, 30, 40, and 50 wt.%, followed by specimen preparation using an injection molding process. The mechanical properties of the composites, including tensile, flexural, and impact were characterized. The results indicated that tensile strengths decreased significantly with increasing loading levels of CaCO3 particles while the tensile and flexural modulus increased significantly with increasing particle loadings. The composite tensile properties changed linearly with increasing CaCO3 loadings. The notched Izod impact strength of the composites was sustained by adding CaCO3 particles up to 40 wt.% while the unnotched impact strength decreased significantly with the addition of CaCO3 particles. Different deformation mechanisms between notched (fracture propagation) and unnotched (fracture initiation and propagation) impact tests were proposed to be the reason.
6
YAMAGUCHI, Takao, Yasuoka KOBAYASHI, Imao NAGASAKA, and Tomoyuki TAKASAN. "Impact Properties of S45C under Tensile Loading." Tetsu-to-Hagane 87, no. 11 (2001): 713–18. http://dx.doi.org/10.2355/tetsutohagane1955.87.11_713.
Full text
7
Kalam, Anizah, M. N. Berhan, and Hanafi Ismail. "The Effects of Oil Palm Fruit Bunch (OPFB) Fiber and Coupling Agent Loadings on the Performance of Hybrid Composites." Advanced Materials Research 535-537 (June 2012): 154–60. http://dx.doi.org/10.4028/www.scientific.net/amr.535-537.154.
Full textAbstract:
Hybrid composites were prepared by incorporating oil palm fruit bunch (OPFB) fibre in the mixture of clay and polypropylene as secondary filler. OPFB and MAPP loadings were varied to investigate it effects on the performance. Tensile and impact tests were performed on the hybrid composites to evaluate their mechanical performances. Water absorption and thermal degradation tests were also conducted on the hybrid composites. Results indicated that the incorporation of OPFB in PP/PPnanoclay has decreased the thermal stability of hybrid composites. Tensile modulus of hybrid composites increased as the OPFB loading increases and further increased with the increasing of MAPP loading. Generally the tensile strength has decreased with the addition of OPFB, however slight increased was observed when the MAPP loading was increased. The impact strength has also increased with the increasing of OPFB for higher MAPP loading.
8
Silberschmidt, Vadim V., Juan Pablo Casas-Rodriguez, and Ian A. Ashcroft. "Impact Fatigue of Adhesive Joints." Key Engineering Materials 399 (October 2008): 71–78. http://dx.doi.org/10.4028/www.scientific.net/kem.399.71.
Full textAbstract:
The paper presents results of studies into the effect of repetitive low-energy impacting (known as impact fatigue) on reliability and crack growth in adhesively bonded joints. This type of loading is compared to the standard tensile fatigue in order to assess severity of such loading regime. Another loading type studied is a combination of a small portion of repetitive impacts with tensile fatigue. Crack propagation in a joint exposed to these types of loading is studied experimentally and numerically (with finite elements). This analysis is accompanied by microstructural studies of various damage processes, active at different stages of the crack growth process.
9
Naresh, Kakur, Shankar Krishnapillai, and Velmurugan Ramachandran. "Comparative Study of a Neat Epoxy and Unidirectional Carbon/Epoxy Composites under Tensile and Impact Loading." Solid State Phenomena 267 (October 2017): 87–92. http://dx.doi.org/10.4028/www.scientific.net/ssp.267.87.
Full textAbstract:
In the present work, the neat epoxy and different orientations [0°, 45°, 90°, (45°/-45°/45°) s, (±45°/0°/90°) s] of unidirectional carbon/epoxy composites are experimentally studied under tensile and impact loading. The notched impact tests are performed using the Izod impact machine to obtain the energy absorption of neat epoxy and different CFRP composites which is required for effective design of bullet proof jackets and military vehicles. The micro mechanical analysis is employed to determine the shear properties of a matrix using the tensile properties. Using classical laminate theory [CLT], the theoretical tensile properties are determined. The SEM fractography analysis is used to observe the damage mechanisms of neat epoxy and different orientations of CFRP composites subjected to tension and impact loading.
10
Zulkifli, Nur Izzati, and Noorasikin Samat. "Mechanical Properties of Green Recycled Polypropylene Composites: Effect of Maleic Anhydride Grafted Polypropylene (MAPP) Coupling Agent." Advanced Materials Research 812 (September 2013): 187–91. http://dx.doi.org/10.4028/www.scientific.net/amr.812.187.
Full textAbstract:
Recycled polypropylene/microcrystalline cellulose (rPP/MCC) composites were prepared by adding different loadings of maleic anhydride grafted polypropylene (MAPP) coupling agent. The tensile, impact and morphological properties of the composites were investigated. The obtained results show that the tensile and impact strengths of the composites were significantly enhanced with the addition of MAPP loading from 2 to 5 wt%, as compared with unfilled rPP/MCC composites. However, it was found that at low filler content, different amounts of MAPP resulted in no appreciable change in the tensile strength and modulus. Moreover, dynamic mechanical analysis (DMA) results indicated that, increasing the amount of MAPP loading from 2 to 5 wt% in rPP/MCC provide better stiffness of the composite compared to those neat rPP and neat PP. Field emission scanning microscopy (FESEM) has shown that the composite, with MAPP loading, promotes better fibermatrix interaction.
Dissertations / Theses on the topic "Impact tensile loading"
1
Verteramo, Alberto Paolo. "Cartilage response to high strain rates in impact and tensile loading modes." Thesis, University of Leeds, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.424058.
Full text
2
Tsigkourakos, George. "Experimental and numerical analysis of damage in CFRP laminates under static and impact loading conditions." Thesis, Loughborough University, 2013. https://dspace.lboro.ac.uk/2134/13284.
Full textAbstract:
Engineering composites and especially long fibre carbon composites have been in high demand not only in aerospace and automotive applications, but also in high end everyday applications. In aerospace, carbon composites are used predominantly for secondary structures attached by joints or fasteners to various alloys or even different composites, and are exposed to service loads and repetitive impacting. Impact fatigue (IF) is not studied adequately for long cycles and relevant literature is investigating mainly drop weight tests and high speed projectile experiments. The main aim of this research was to investigate the behaviour long fibre CFRP'S exposed to repeated low-velocity, low energy impacts, and to observe the damage effects of this regime on the structural integrity of these materials. Two types of specimen configurations using CFRPS's were used and exposed to loading conditions relevant to the Izod impact fatigue test (IIFT), and the tensile impact fatigue test (TIFT), in order to determine the fatigue behaviour of the specimens for each of these load conditions. For the IIFT, the fatigue life was investigated using IM7/8552 unidirectional specimens and T700/LTM45 cross-ply specimens were utilised for the TIFT. The specimen thicknesses were altered in both cases and parametric studies were carried out, where it was seen that IF results in high level of scatter and the apparent decrease in life was seen at relatively modest levels of maximum force after relatively few cycles. In the case of the IIFT, a durability limit was not apparent which increases the complications when designing against IF. In the case of the TIFT the stiffness deterioration was reflected as an increase of the loading time, in the force vs time graph, over the total fatigue life span. Fatigue crack growth was investigated using fractography and X-ray micro-CT at the micro and macro level. It was seen, that IF had the potential to initiate cracks and to cause their propagation at low levels of loading. For the IIFT, a single crack was growing substantially in the fibre direction and across the sample width causing matrix cracking and probably breaking of some fibres, which acted as impact wave guides since matrix cracks were propagating initially along the length of the fibres. In the case of the TIFT multiple damage modes were presented (matrix cracks, axial splits and delaminations). Their sequence and progression was successfully v captured and contrasted against the number of impacts. Axial splits governed the damage scenario, with delaminations extending between them and the free edges. For the TIFT, IF was studied using the force-life (F-Nf) and energy-life (E-Nf) curves. The tests undertaken showed that when halving the thickness of the laminates the fatigue life presented a 10-fold decrease as well as higher scatter. Finite element modelling was undertaken to validate the experimental data of the TIFT test. Successful simulation of a single impact was carried out using a fully transient 3-D model of the actual experiment configuration which involved geometric non-linearities in addition to the multiple contact conditions. The analysis was undertaken using the Abaqus 6.11 explicit solver. Since the numerical single impact results (force vs time response) was in agreement with the experimental results, the crack modes, experimentally observed, were also incorporated in the model utilising the use of the cohesive zone elements (CZE).
3
Das, Sagar. "A strain-rate dependent tensile damage model for brittle materials under impact loading." Thesis, The University of Sydney, 2016. http://hdl.handle.net/2123/15612.
Full textAbstract:
Brittle materials are often subjected to high strain rate impact load, which could be imposed due to intentional demolition purposes or during ballistic impact on protective structures. Fragments of different sizes are generally observed by such impact, which are directly related to the strain rate experienced by the material at different locations. This thesis presents a rate-dependent constitutive model to predict such dynamic behaviour of brittle solid under tensile loading. A three-parameter rate dependent tensile damage model, under continuum mechanics framework, is developed for simulating the fragmentation of brittle materials subjected to high strain-rate loading. The damage model is formulated under the assumption that the isotropic and homogeneous material contains initial microcracks and the microcrack induced damage increases when a critical volumetric strain is exceeded. Considering the microcrack induced damage and energy into account, a quantitative and direct method is developed to determine the fragment size under a constant strain rate loading. In this model, instead of assuming spherical fragment, more realistic prolate spheroid fragment is assumed, which eventually determines the more accurate surface energy from a fragment. In addition, complete strain energy (until the fracture of the material) is considered which improves the global energy balance in predicting the size of a fragment. The parameters of this model can be conveniently calibrated by experimental data on fracture strength and strain rate. The proposed rate-dependent model is validated by a spall experiment of concrete and with a dynamic Brazilian disc experiment of sandstone. Both of these experiments are numerically simulated with the proposed model and the experimental observations are compared with the simulation. The predicted strain rate, fracture strength, fracture location and fragment size are in very good agreement with those obtained in the experiments.
4
Curosu, Iurie. "Influence of fiber type and matrix composition on the tensile behavior of strain-hardening cement-based composites (SHCC) under impact loading." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2018. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-233204.
Full textAbstract:
Strain-hardening cement-based composites (SHCC) are a special class of fiber-reinforced concrete which develop multiple, fine cracks when subjected to increasing tensile loading, reaching strain capacities of up to several percent. The tensile behavior of SHCC is a result of a purposeful material design accounting for the mechanical and physical properties of the cementitious matrix, of the reinforcing fibers and of their interaction. The exceptionally high energy dissipation through inelastic deformations before reaching tensile strength makes SHCC suitable for manufacturing or strengthening of structural elements which may be subjected to impact loading. However, the tensile behavior of SHCC is highly strain rate dependent, both in terms of tensile strength and strain capacity. The different strain rate sensitivities of the constitutive phases of SHCC (matrix, fiber and interfacial bond) lead to disproportionate dynamic alteration of their mechanical properties under increasing strain rates and, consequently, to an impairment of the micromechanical balance necessary for strain-hardening and multiple cracking. Thus, high energy dissipation under impact loading can only be ensured through a targeted material design. This work presents a series of mechanical experiments at different strain rates and different scales of investigation with the goal of developing a qualitative and quantitative basis for formulating material design recommendations for impact resistant SHCC. Three different types of SHCC were investigated, consisting of two types of polymer fibers (polyvinyl-alcohol and high-density polyethylene) and cementitious matrices (normal-strength and high-strength). Uniaxial tension experiments were performed on SHCC specimens and on non-reinforced matrix specimens with different testing setups at strain rates ranging from 10-4 to 150 s-1. Besides the measured mechanical properties, special attention was paid to the crack patterns and the condition of fracture surfaces. Additionally, micro-scale investigations were performed to quantify the strain rate dependent changes in the mechanical behavior of individual component phases, i.e., matrix, fibers and fiber-matrix bond. The results obtained from the micromechanical investigations were used in an analytical model for crack bridging. The model links the micromechanical parameters and their strain rate sensitivities to the single-crack opening behavior under increasing displacement rates, making it useful for material design purposes. If given an extensive experimental basis for the fracture mechanical properties of the non-reinforced cementitious matrices, the model can be extended for predicting the strain capacity (multiple cracking) of SHCC under different strain rates<br>Die hochduktilen Betone (Engl.: Strain-Hardening Cement-based Composites – SHCC) bilden eine besondere Klasse von Faserbetonen, die eine multiple Rissbildung unter zunehmenden Zugspannungen aufweisen, was zu einer sehr hohen Bruchdehnung führt. Das dehnungsverfestigende, hochduktile Zugverhalten der SHCC wird durch eine gezielte Materialentwicklung erreicht, die die mechanischen und physikalischen Eigenschaften der zementgebundenen Matrizen, der Kurzfasern und deren Zusammenwirkung berücksichtigt. Das außergewöhnliche Energieabsorptionsvermögen der SHCC durch plastische Verformungen vor dem Erreichen der Zugfestigkeit qualifiziert diese Verbundwerkstoffe für die Herstellung oder Verstärkung von Bauteilen, die Impaktbeanspruchungen ausgesetzt sein könnten. Jedoch weisen SHCC sowohl bezüglich deren Zugfestigkeit als auch deren Dehnungskapazität ein ausgeprägtes dehnratenabhängiges Verhalten auf. Unter zunehmenden Dehnraten führen die unterschiedlichen Dehnratensensitivitäten der gestaltenden Phasen von SHCC (Matrix, Faser und deren Verbund) zur Beeinträchtigung des mikromechanischen Gleichgewichts, welches für die Dehnungsverfestigung und multiple Rissbildung erforderlich ist. Eine hohe Energiedissipation unter Impaktbeanspruchungen kann deshalb nur durch eine gezielte Materialentwicklung der SHCC hinsichtlich deren Verhaltens unter hohen Dehnraten gewährleistet werden. Die vorliegende Arbeit umfasst eine Reihe von experimentellen Untersuchungen mit verschiedenen Dehnraten und an unterschiedlichen Betrachtungsebenen, mit dem Ziel eine qualitative und quantitative Basis für Empfehlungen zur Materialentwicklung von Impakt-resistenten SHCC zu schaffen. Drei verschiedene SHCC-Zusammensetzungen wurden untersucht. Die Referenz-Zusammensetzung aus einer normalfesten zementgebundenen Matrix und Polyvinyl-Alkohol-Kurzfasern wurde mit zwei unterschiedlichen SHCC verglichen (hochfest und normalfest), die mit Kurzfasern aus hochdichtem Polyethylen bewehrt wurden. Einaxiale Zugversuche wurden an SHCC-Proben und unbewehrten Matrix-Proben mit verschiedenen Prüfvorrichtungen bei Dehnraten von 10-4 bis 150 s-1 durchgeführt. Zusätzlich zu den gemessenen mechanischen Eigenschaften wurden die Rissbildung und die Bruchflächen detailliert untersucht. Darüber hinaus wurden mikromechanische Untersuchungen durchgeführt, um die Dehnratensensitivität der einzelnen Phasen, d.h. Matrix, Faser und deren Verbund zu beschreiben. Die aus den mikromechanischen Untersuchungen erzielten Ergebnisse wurden als Eingangswerte in einem analytischen Einzelriss-Modell verwendet. Das entwickelte Modell verbindet die mikromechanischen Parameter und deren Dehnratenabhängigkeit mit dem Rissöffnungsverhalten von SHCC bei zunehmenden Verschiebungsraten. Das macht es vorteilhaft für Materialentwicklungszwecke. Das Modell kann für die Vorhersage der Dehnungskapazität von SHCC bei diversen Dehnraten weiterentwickelt werden, wenn eine umfassende experimentelle Basis für die bruchmechanischen Eigenschaften der Matrizen vorliegt
5
Gong, Ting. "Tensile behavior of high-performance cement-based composites with hybrid reinforcement subjected to quasi-static and impact loading." Technische Universität Dresden, 2020. https://tud.qucosa.de/id/qucosa%3A73914.
Full textAbstract:
Hochduktile Betone (Engl.: Strain-Hardening Cement-based Composites – SHCC) und Textilbetone (engl.: Textile Reinforced Concrete – TRC) sind zwei neuartige Faserbetone, die ein duktiles und dehnungsverfestigendes Zugverhalten aufweisen. SHCC bestehen aus feinkörnigen Zementmatrizen und kurzen Hochleistungspolymerfasern, während TRC eine Kombination aus feinkörnigen Zementmatrizen und kontinuierlichen zwei- oder dreidimensionalen Textilschichten darstellt. Letztere bestehen aus Multifilamentgarnen aus Kohlenstoff, alkalibeständigem Glas oder Polymerfasern. Die hohe elastische Verformbarkeit beider Verbundwerkstoffe bis zum Erreichen der Zugfestigkeit entsteht aus der sukzessiven Bildung multipler feiner Risse. Neben der hervorragenden Risskontrolle und Duktilität weisen diese Verbundwerkstoffe ein hohes Energieabsorptionsvermögen auf, was in Bezug auf kurzzeitdynamische Belastungen eine durchaus erstrebenswerte Eigenschaft darstellt.
Obwohl SHCC eine höhere Dehnungskapazität als herkömmliche TRC zeigen, weisen die Textilbetone eine erheblich höhere Zugfestigkeit auf. Darüber hinaus besitzen die textilbewehrten Betone deutlich niedrigere Einflüsse von Anwendungstechnologie und Maßstab auf das Zugverhalten, d. h. eine bessere Robustheit. Daher stellt die Kombination dieser beiden Bewehrungskonzepte einen vielversprechenden Ansatz dar. Während die Kurzfasern für eine bessere Risskontrolle und Erstrissfestigkeit sorgen, sichern die Textilgelege eine hohe Zugfestigkeit sowie Steifigkeit im gerissenen Zustand und eine gleichmäßige Verteilung der Kräfte in der Verstärkungsschicht bzw. im Bauteil. Dieser synergetische Effekt kann jedoch nur durch eine zielgerichtete Materialentwicklung erreicht werden, die eine grundlegende Materialcharakterisierung unter verschiedenen Belastungsszenarien erfordert.
Im Rahmen des DFG-finanzierten Graduiertenkollegs GRK 2250 „Impaktsicherheit von Baukonstruktionen durch mineralisch gebundene Komposite“ werden duktile und Impakt resistente Komposite entwickelt, charakterisiert und erprobt, die als dünne Verstärkungsschichten auf bestehende Konstruktionen bzw. Bauelemente aufgetragen werden und dadurch deren Widerstandsfähigkeit und Resilienz gegen extreme kurzzeitdynamische Beanspruchungen signifikant erhöhen. Die in der vorliegenden Arbeit vorgestellten Ergebnisse wurden im Rahmen des A3-Projektes innerhalb des GRK 2250/1 erzielt. Ziel dieser Arbeit war es, die grundlegenden mechanischen Eigenschaften und die Dehnratenabhängigkeit von mineralisch gebundenen Kompositen mit hybrider Faserbewehrung zu erfassen und zu beschreiben. Das Forschungskonzept besteht aus systematischen und parametrischen Untersuchungen der einzelnen Komponenten (Faser, Textil, zementgebundene Matrix), ihres Verbundes und der entsprechenden Verbundwerkstoffe. Hierfür wurden zweckbestimmte Prüfkonfigurationen und dreidimensionale Messverfahren angewandt, die in anderen Projekten des GRK 2250/1 entwickelt wurden. Außer uniaxialen, quasistatischen und dynamischen Zugversuchen wurden quasistatische und dynamische Einzelgarnauszugsversuche durchgeführt. Die wichtigsten untersuchten Materialparameter waren die Art der Kurzfaserbewehrung und der Textilien (Material, geometrische und Oberflächeneigenschaften, Art der Tränkung usw.).
Auf Basis der mechanischen Experimente wurde ein analytisches Modell eingesetzt und angepasst, dass das Zugverhalten solcher Komposite in Abhängigkeit von verschiedenen Materialparametern abbilden soll.
Zusätzlich zu der detaillierten Beschreibung der Materialeigenschaften, der maßgebenden Mechanismen und synergetischen Effekte bilden die erzielten Ergebnisse eine umfangreiche experimentelle Basis für eine empirische und Modell gestützte Weiterentwicklung und Optimierung dieser Verbundwerkstoffe mit Hinblick auf wirtschaftliche und ökonomische Aspekte.<br>Strain-hardening cement-based composites (SHCC) and textile-reinforced concrete (TRC) are two novel types of fiber-reinforced cementitious composites that exhibit ductile, strain-hardening tensile behavior. SHCC comprises fine-grained cementitious matrices and short, high-performance polymer fiber, while TRC is a combination of a fine-grained, cementitious matrix and continuous two- or three- dimensional textile layers of multi-filament yarns, usually made of carbon or alkali-resistant glass. Both composites yield high inelastic deformations in a strain-hardening phase due to the successive formation of multiple fine cracks. Such cracking behavior stands for high energy absorption of the composites when exposed to extreme loading, without abrupt loss of load-bearing capacity.
In comparative terms, SHCC shows superior strain capacity, while TRC yields considerably higher tensile strength. The addition of short fibers strengthens the matrix by efficiently restraining the micro-cracks’ growth and reducing spallation, while the textile reinforcement ensures a secure confinement of the reinforced concrete element (substrate to be strengthened), as well as a favorable stress distribution. The combination of SHCC and textile reinforcement is expected to deliver high tensile strength and stiffness in the strain-hardening stage along with pronounced multiple cracking. In order to achieve a favorable synergetic effect, a purposeful material design is required based on a clear understanding of the mechanical interactions in the composites.
In the framework of the DFG Research Training Group GRK 2250, which aims at enhancing structural impact safety through thin strengthening layers made of high-performance mineral-based composites, this work focuses on developing hybrid fiber-reinforced cementitious materials to be applied on the impact rear side. The development concept builds upon a systematic investigation of various aspects of the mechanical behaviors of SHCC and textile at quasi-static and impact strain rates, including the bond properties of fiber to matrix and textile to matrix. Accordingly, uniaxial quasi-static tension tests were first performed on SHCC, bare textile, and hybrid-reinforced composite specimens. The parameters under investigation were types of short fiber and textile reinforcements, reinforcing the ratio for textile as well as bond properties between textile and the surrounding SHCC. Furthermore, impact tension tests were performed to study the strain rate effect on the synergetic composite response. Finally, single-yarn pull-out tests were carried out under both quasi-static and impact loading rates to supplement the comparative assessment of the hybrid fiber-reinforced composites. These tests yielded shear strength-related parameters for quantifying the bond properties of different materials, which were then used as input of the analytical model developed to describe the mechanics of crack propagation and tension stiffening effect of textile-reinforced composites without short fibers. This model is the first step towards a comprehensive analytical description of the tensile behavior of hybrid fiber-reinforced composites based on the experimental data and input parameters attained through the work at hand.
6
Gong, Ting [Verfasser], Viktor [Gutachter] Mechtcherine, Viktor [Akademischer Betreuer] Mechtcherine, Christina [Gutachter] Scheffler, and Christopher Kin Ying [Gutachter] Leung. "Tensile behavior of high-performance cement-based composites with hybrid reinforcement subjected to quasi-static and impact loading / Ting Gong ; Gutachter: Viktor Mechtcherine, Christina Scheffler, Christopher Kin Ying Leung ; Betreuer: Viktor Mechtcherine." Dresden : Technische Universität Dresden, 2021. http://d-nb.info/1231917342/34.
Full text
7
Curoşu, Iurie [Verfasser], Viktor [Akademischer Betreuer] Mechtcherine, Ulrich [Gutachter] Häußler-Combe, and Ravi [Gutachter] Ranade. "Influence of fiber type and matrix composition on the tensile behavior of strain-hardening cement-based composites (SHCC) under impact loading / Iurie Curosu ; Gutachter: Ulrich Häußler-Combe, Ravi Ranade ; Betreuer: Viktor Mechtcherine." Dresden : Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2018. http://d-nb.info/1156169380/34.
Full text
8
Curosu, Iurie. "Influence of fiber type and matrix composition on the tensile behavior of strain-hardening cement-based composites (SHCC) under impact loading." Doctoral thesis, 2017. https://tud.qucosa.de/id/qucosa%3A30801.
Full textAbstract:
Strain-hardening cement-based composites (SHCC) are a special class of fiber-reinforced concrete which develop multiple, fine cracks when subjected to increasing tensile loading, reaching strain capacities of up to several percent. The tensile behavior of SHCC is a result of a purposeful material design accounting for the mechanical and physical properties of the cementitious matrix, of the reinforcing fibers and of their interaction.
The exceptionally high energy dissipation through inelastic deformations before reaching tensile strength makes SHCC suitable for manufacturing or strengthening of structural elements which may be subjected to impact loading. However, the tensile behavior of SHCC is highly strain rate dependent, both in terms of tensile strength and strain capacity. The different strain rate sensitivities of the constitutive phases of SHCC (matrix, fiber and interfacial bond) lead to disproportionate dynamic alteration of their mechanical properties under increasing strain rates and, consequently, to an impairment of the micromechanical balance necessary for strain-hardening and multiple cracking. Thus, high energy dissipation under impact loading can only be ensured through a targeted material design.
This work presents a series of mechanical experiments at different strain rates and different scales of investigation with the goal of developing a qualitative and quantitative basis for formulating material design recommendations for impact resistant SHCC. Three different types of SHCC were investigated, consisting of two types of polymer fibers (polyvinyl-alcohol and high-density polyethylene) and cementitious matrices (normal-strength and high-strength).
Uniaxial tension experiments were performed on SHCC specimens and on non-reinforced matrix specimens with different testing setups at strain rates ranging from 10-4 to 150 s-1. Besides the measured mechanical properties, special attention was paid to the crack patterns and the condition of fracture surfaces. Additionally, micro-scale investigations were performed to quantify the strain rate dependent changes in the mechanical behavior of individual component phases, i.e., matrix, fibers and fiber-matrix bond.
The results obtained from the micromechanical investigations were used in an analytical model for crack bridging. The model links the micromechanical parameters and their strain rate sensitivities to the single-crack opening behavior under increasing displacement rates, making it useful for material design purposes. If given an extensive experimental basis for the fracture mechanical properties of the non-reinforced cementitious matrices, the model can be extended for predicting the strain capacity (multiple cracking) of SHCC under different strain rates.<br>Die hochduktilen Betone (Engl.: Strain-Hardening Cement-based Composites – SHCC) bilden eine besondere Klasse von Faserbetonen, die eine multiple Rissbildung unter zunehmenden Zugspannungen aufweisen, was zu einer sehr hohen Bruchdehnung führt. Das dehnungsverfestigende, hochduktile Zugverhalten der SHCC wird durch eine gezielte Materialentwicklung erreicht, die die mechanischen und physikalischen Eigenschaften der zementgebundenen Matrizen, der Kurzfasern und deren Zusammenwirkung berücksichtigt.
Das außergewöhnliche Energieabsorptionsvermögen der SHCC durch plastische Verformungen vor dem Erreichen der Zugfestigkeit qualifiziert diese Verbundwerkstoffe für die Herstellung oder Verstärkung von Bauteilen, die Impaktbeanspruchungen ausgesetzt sein könnten. Jedoch weisen SHCC sowohl bezüglich deren Zugfestigkeit als auch deren Dehnungskapazität ein ausgeprägtes dehnratenabhängiges Verhalten auf. Unter zunehmenden Dehnraten führen die unterschiedlichen Dehnratensensitivitäten der gestaltenden Phasen von SHCC (Matrix, Faser und deren Verbund) zur Beeinträchtigung des mikromechanischen Gleichgewichts, welches für die Dehnungsverfestigung und multiple Rissbildung erforderlich ist. Eine hohe Energiedissipation unter Impaktbeanspruchungen kann deshalb nur durch eine gezielte Materialentwicklung der SHCC hinsichtlich deren Verhaltens unter hohen Dehnraten gewährleistet werden.
Die vorliegende Arbeit umfasst eine Reihe von experimentellen Untersuchungen mit verschiedenen Dehnraten und an unterschiedlichen Betrachtungsebenen, mit dem Ziel eine qualitative und quantitative Basis für Empfehlungen zur Materialentwicklung von Impakt-resistenten SHCC zu schaffen. Drei verschiedene SHCC-Zusammensetzungen wurden untersucht. Die Referenz-Zusammensetzung aus einer normalfesten zementgebundenen Matrix und Polyvinyl-Alkohol-Kurzfasern wurde mit zwei unterschiedlichen SHCC verglichen (hochfest und normalfest), die mit Kurzfasern aus hochdichtem Polyethylen bewehrt wurden.
Einaxiale Zugversuche wurden an SHCC-Proben und unbewehrten Matrix-Proben mit verschiedenen Prüfvorrichtungen bei Dehnraten von 10-4 bis 150 s-1 durchgeführt. Zusätzlich zu den gemessenen mechanischen Eigenschaften wurden die Rissbildung und die Bruchflächen detailliert untersucht. Darüber hinaus wurden mikromechanische Untersuchungen durchgeführt, um die Dehnratensensitivität der einzelnen Phasen, d.h. Matrix, Faser und deren Verbund zu beschreiben.
Die aus den mikromechanischen Untersuchungen erzielten Ergebnisse wurden als Eingangswerte in einem analytischen Einzelriss-Modell verwendet. Das entwickelte Modell verbindet die mikromechanischen Parameter und deren Dehnratenabhängigkeit mit dem Rissöffnungsverhalten von SHCC bei zunehmenden Verschiebungsraten. Das macht es vorteilhaft für Materialentwicklungszwecke. Das Modell kann für die Vorhersage der Dehnungskapazität von SHCC bei diversen Dehnraten weiterentwickelt werden, wenn eine umfassende experimentelle Basis für die bruchmechanischen Eigenschaften der Matrizen vorliegt.
Books on the topic "Impact tensile loading"
1
United States. National Aeronautics and Space Administration. Scientific and Technical Information Program., ed. Acoustic emission monitoring of low velocity impact damage in graphite/epoxy laminates during tensile loading. National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Program, 1992.
Find full text
2
United States. National Aeronautics and Space Administration. Scientific and Technical Information Program., ed. Acoustic emission monitoring of low velocity impact damage in graphite/epoxy laminates during tensile loading. National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Program, 1992.
Find full textBook chapters on the topic "Impact tensile loading"
1
Steiner, Daniel, Bernhard Hofko, Mariyan Dimitrov, and Ronald Blab. "Impact of Loading Rate and Temperature on Tensile Strength of Asphalt Mixtures at Low Temperatures." In RILEM Bookseries. Springer Netherlands, 2016. http://dx.doi.org/10.1007/978-94-024-0867-6_10.
Full text
2
Gara, Navya, R. Jayaganthan, and R. Velmurugan. "Strain Rate Studies on Metallic and Non-Metallic Materials for Tensile and Compressive Behaviour Under Impact Loading." In Composite Materials. CRC Press, 2023. http://dx.doi.org/10.1201/9781003352358-1.
Full text
3
Monticeli, Francisco Maciel, Felipe Ruivo Fuga, Mariano Andrés Arbelo, and Maurício Vicente Donadon. "Investigation on Induced Intra/Interlaminar Damage Propagation in CFRP Subjected to Cyclic Tensile Loading After Impact (TAI)." In Lecture Notes in Mechanical Engineering. Springer Nature Switzerland, 2025. https://doi.org/10.1007/978-3-031-82979-6_23.
Full text
4
Curosu, Iurie, Viktor Mechtcherine, Daniele Forni, and Ezio Cadoni. "Influence of Fiber Type on the Tensile Behavior of Strain-Hardening Cement-Based Composites (SHCC) Under Impact Loading." In Strain-Hardening Cement-Based Composites. Springer Netherlands, 2017. http://dx.doi.org/10.1007/978-94-024-1194-2_30.
Full text
5
Kang, Ki Weon, Jung Kyu Kim, and Heung Seob Kim. "Fatigue Behavior of Impacted Plain-Weave Glass/Epoxy Composites under Tensile Fatigue Loading." In Key Engineering Materials. Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-978-4.1291.
Full text
6
"High Strain Rate Tensile Testing." In Tensile Testing, 2nd ed. ASM International, 2004. http://dx.doi.org/10.31399/asm.tb.tt2.t51060251.
Full textAbstract:
Abstract High strain rate tensile testing is used to understand the response of materials to dynamic loading. The behavior of materials under high strain rate tensile loads may differ considerably from that observed in conventional tensile tests. This chapter discusses the processes involved in determining strain rate effects in tension by conventional tensile tests and covers expanding ring tests, flat plate impact tests, split-Hopkinson pressure bar tests, and rotating wheel tests.
7
Kubade, Pravin R., Amol N. Patil, and Hrushikesh B. Kulkarni. "Structure Properties Relationship Studies of Vinyl Ester Hybrid Syntactic Foam." In Handbook of Research on Advancements in Manufacturing, Materials, and Mechanical Engineering. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-4939-1.ch018.
Full textAbstract:
Syntactic foam is the porous composite produced by mixing prefabricated hollow spherical particle into the matrix. Syntactic foams are used as energy absorption sandwich core for several applications like marine, automotive, and aerospace. In this work, low density hollow glass microspheres are hybridized with fly ash cenosphere in Bisphenol-A epoxy-based vinyl ester matrix. Hybrid syntactic foams is created with 60% total filler content. Within these hybrid systems internal composition of two fillers were varied in a step of 25 vol% with respect to each other. Hybrid syntactic foams are prepared by the hand lay-up (molding) method. The physical characterization parameter contains density and matrix porosity whereas tensile, quasi-static compression, flexural (3-point bending), Izod impact, and micro Vickers hardness are grouped as mechanical characterization parameters. Scanning electron microscopy was performed on fractured surfaces to examine deformation and fracture mechanisms related with each loading condition.
8
Liu X.C., Rizza R., Thometz J., Tassone C., and Lyon R. "The Effect on the Intervertebral Pressure Distribution in a Goat Spine upon Implementation of a Spring-Like Device." In Studies in Health Technology and Informatics. IOS Press, 2008. https://doi.org/10.3233/978-1-58603-888-5-355.
Full textAbstract:
The objective of this study was to implement a computer model to evaluate the effect of instrument stiffness on the intervertebral pressure during tensile loading on a goat spine. Seven spines (4 different goats, aged 4 to 7 months) were divided into four segments. With end vertebrae cemented in a customized fixture for MTS&reg;, a spring was screwed into the right side of the spine. A pressure matrix with 4 sensors was inserted into the disc space. The compressive load (150 N) was decreased by slowly applying a tensile force until the net force was zero. A computer model of two vertebrae, one disc and a 10 or 20 N/mm spring was developed using Patran/Nastran&reg; and the in-vitro tests. Figure 1 and 2 show that for a 50 N compressive force, the intervertebral pressure increased for the 20 N/mm instrument as compared to 10 N/mm instrument. Computer modeling indicates that the intervertebral pressure for an instrumented spine is affected by resistance of the applied force and shifted toward the non-instrumented side. The model predicts the relationship between instrument stiffness and intervertebral pressure distribution, which will be critical in determining the impact of stiffness on the growth plate. Compared to the instrument with a stiffness of 10 N/mm, the 20 N/mm instrument, has an increased intervertebral stress that may further affect the modulation of the physis during growth.
9
"Effect of Cavitation Impacts on Crack Propagation in Epoxy Resin Subjected to Tensile Loading." In Proceedings of the 10th International Symposium on Cavitation (CAV2018). ASME Press, 2018. http://dx.doi.org/10.1115/1.861851_ch61.
Full text
10
Chao E.Y., Barrance P., Genda E., Iwasaki N., Kato S., and Faust A. "Virtual Reality (VR) Techniques in Orthopaedic Research and Practice." In Studies in Health Technology and Informatics. IOS Press, 1997. https://doi.org/10.3233/978-1-60750-883-0-107.
Full textAbstract:
Modeling the musculoskeletal joint system using biomechanical analysis and computer graphics techniques allows us to visualize normal, diseased and reconstructed joint function. This model can be used to study the loading of bones and joints under theoretical and simulated activities. In this study, intact cadavers were imaged using MRI, CT scanning and cryo-sectioning techniques. Using sequential pixel information of bone and soft tissue boundaries collected from digital camera images, MRI and CT scans, the volumetric models of the musculoskeletal joint system are reconstructed. &ldquo;Descriptive geometry&rdquo; techniques which treat bones as rigid bodies and cartilage, ligament and muscles as deformable bodies were used to construct the model. Joint resultant forces and moments were determined using an inverse dynamics formulation, while ligament tension, joint contact pressure, and bone stresses are solved through a simplified Rigid Body Spring Modeling technique and the Finite Element Method. The results under static and dynamic loading activities can be visualized using interactive computer graphics. The advantages of such a model are the elimination of the need for large numbers of intact cadaveric specimens, and the unprecedented capability to study joint loading responses under normal, abnormal and surgically reconstructed states. Such a model and its analytical capability are ideal for pre-operative planning and computer-assisted orthopaedic surgery. This Visual, Interactive, Computational, and Anatomic Model(VICAM) and its associated analysis capability represent the next generation of technology which will have an enormous impact in orthopaedic research, education and patient care.
Conference papers on the topic "Impact tensile loading"
1
Muttaqin, Maraghi, Bustami Syam, Muhammad Yani, et al. "Fracture Initiation and Development of Road Marker Subjected to Impact Loading." In International Conference on Experimental and Computational Mechanic in Engineering 2023. Trans Tech Publications Ltd, 2025. https://doi.org/10.4028/p-jkjao0.
Full textAbstract:
To meet the needs of road marking design and manufacturing, we ensure that our products meet the ergonomic aspects. strong, comfortable and esthetical. Strength, of course, has something to do with the strength of the material and the structure stability of the road marking products. Plastic road marking material are not strong enough to withstand large impacts. Concrete road markers are also heavy and difficult to transport and install because they require a mobile crane. Based on this, temporary road markings are made from concrete foam composites, the mass of which is lighter than concrete and stronger than plastic. The purpose of this study was to analyze the responses of road markers under impact loading produced by motor cycle. Ansys software is used as a numerical tool to simulate the stability of the structure of road markings. There are two-types of road marking models. Type 1 is a two-part in which both pole and base structure can be separately manufactured and assembled. Type 2 consists of one parts pole integrated with base structure of markers. The shape of the road markings is a hollow pole of 750 mm long with inner diameter of 50mm and outer diameter of 100mm. The base structure has 100mm thick and outer diameter of 300mm. To evaluate the responses of markers, a FEM based ANSYS software is used. Providing a motor cycle impact load of 100kg at 188 mm from base with a speed of 40km/h, the structural integrity of markers, that is, their response to static external loads is calculated. It is shown that the equivalent stress and stress in y-direction reach the maximum values when impacted on B location both for type 1 and type 2, respectively. For both cases the stress values are far below the ultimate tensile strength of the concrete foam materials. Thus, the impact load will not cause the failure of the road markers structure. In terms of production, type 2 road markers are easier to manufacture. It can be casted in two parts: base structure and pole. They are also practically easy for loading and unloading. Thus, for the continuation of research the type 2 road markers will be produced and tested in our research center. Keyword: Road Markers, Concrete Foam Composite, Motor Cycle Load. Software Ansys
2
Turnbull, Alan, Gareth Hinds, and Shengqi Zhou. "Impact of Solution Chemistry on Pitting and Stress Corrosion Cracking of Steam Turbine Disc Steels." In CORROSION 2004. NACE International, 2004. https://doi.org/10.5006/c2004-04571.
Full textAbstract:
Abstract A summary is given of recent measurements to evaluate the effect of solution chemistry variables on the likelihood of stress corrosion cracking of a steam turbine disc steel, 3NiCrMoV. Exposure tests were carried out for the disc steel in the form of cylindrical tensile specimens stressed to 90% of σ0,2 and immersed at 90 °C for up to 22 months in deaerated pure water, aerated water, and aerated water containing 1.5 ppm chloride. Pitting was observed in all cases with the pit growth rate being greatest for the aerated water containing chloride. No cracking was observed in deaerated pure water but cracks initiated in aerated water. A minimum pit depth of about 50 μm was required for crack initiation. The percentage of pits with cracks at a specific depth in aerated solution was described by a Weibull function and seemed unaffected by chloride or exposure time. In order to assess the impact of two-shifting operation (on-load to off-load cycling) of a steam turbine plant, the effect of oxygen excursions on the corrosion potential of a steam turbine disc steel was studied. Off-load, the liquid film on the turbine surface was assumed to be aerated water, but a range of environments, including deaerated water, deaerated 300 ppb, 600 ppb and 1.5 ppm Cl- solution, and deaerated 300 ppb Cl- + 300 ppb SO42- solution, were considered to represent the range of possible condensate solution chemistry on-load. The measurements indicate a consistently higher mean corrosion potential compared with base-loading, although less marked in the presence of sulphate. The risk of increased pitting and stress corrosion cracking as a consequence of two-shifting would appear to depend critically on the concentration of sulphate in the condensate in service.
3
Reisewitz, Tom, Alexander Pauli, and Geralt Siebert. "On the hyperelastic material behaviour of polyurethane in the context of structural sealant glazing." In IABSE Congress, San José 2024: Beyond Structural Engineering in a Changing World. International Association for Bridge and Structural Engineering (IABSE), 2024. https://doi.org/10.2749/sanjose.2024.0676.
Full textAbstract:
<p>Structural glazing joints in glass construction are subject to dynamic earthquake loads in certain regions. To date, however, there is no recognized proposal for the design of such situations. The verification for earthquake loads is either neglected for glass structures or carried out with equivalent values for the entire building. Not considering the behaviour of the bonded joints under dynamic loading might be insufficient, especially in the presence of heavy glass elements.</p><p>Dynamic loads on bonded glass constructions influence the structural design concerning resistance and influence. The load-bearing capacity of the structural sealant might be reduced on the one-hand side, while the impact on the bond might be decreased on the other-hand side.</p><p>Silicone adhesives have been used almost exclusively for structural sealant glazing (SSG) since the 1970s. This is partly due to the special UV resistance. However, the facade industry has developed enormously since then and there are many solutions to counteract UV radiation. Therefore, other robust adhesives should also be considered for SSG applications. Especially for catastrophic scenarios such as dynamic earthquake loads or hurricanes, where very large deformations and high load velocities can occur within the bond, it is of interest to find more suitable materials. Previous studies have shown that polyurethanes could be a suitable choice for this application.</p><p>A more thorough investigation of the structural performance of polyurethane within bonded glass structures under different loading scenarios is urgently required and an appropriate material model is essential. The calibration of this model is crucial to better understand the performance under dynamic loading. Identify the material parameters for this model based on DMTA and tensile tests seems promising.</p>
4
Ambrisko, Lubomir. "TENSILE PROPERTIES OF CONVEYOR BELTS AFTER THE IMPACT LOADING." In 20th International Multidisciplinary Scientific GeoConference Proceedings SGEM 2020. STEF92 Technology, 2020. http://dx.doi.org/10.5593/sgem2020/1.2/s03.039.
Full text
5
Song, L., L. M. Yang, and F. L. Huang. "Testing the impact tensile properties of ceramics with SHPB." In DYMAT 2009 - 9th International Conferences on the Mechanical and Physical Behaviour of Materials under Dynamic Loading. EDP Sciences, 2009. http://dx.doi.org/10.1051/dymat/2009068.
Full text
6
Burkett, M. W. "Eulerian Hydrocode Modeling of a Dynamic Tensile Extrusion Experiment." In 2019 15th Hypervelocity Impact Symposium. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/hvis2019-057.
Full textAbstract:
Abstract Eulerian hydrocode simulations using the Mechanical Threshold Stress (MTS), Zerilli-Armstrong (Z-A), and Johnson Cook (J-C) flow stress models were performed to provide insights into dynamic tensile extrusion (DTE) experiments with copper (Cu) and tantalum (Ta). The extrusion of Cu and Ta projectiles was simulated with an explicit, two-dimensional Eulerian continuum mechanics hydrocode and compared with data to determine if this extrusion concept is a useful indirect hydrocode material strength model evaluation experiment. The data consisted of high-speed images of the extrusion process, photon Doppler velocimetry (PDV) to measure the projectile velocity history and die transit time, dynamic temperature measurements of the extruded material, recovered extruded samples, and post-test metallography. The hydrocode was developed to predict large-strain and high-strain-rate loading problems. The code features a high-order advection algorithm, material interface tracking scheme, and van Leer monotonic advection-limiting algorithm. The strength models were utilized to evolve the flow stress (σ) as a function of strain, strain rate, and temperature. Average strain rates on the order of 104 s−1 and plastic strains exceeding 300% were predicted in the extrusion of copper at impact velocities between 400–450 m/s, while plastic strains exceeding 800% were predicted for Ta. The predicted and measured deformation topologies, projectile velocity profiles and die transits times, plastic strains, and temperatures were qualitatively compared. The flow stress distributions predicted by the three strength models were also compared for one experiment. Finally, the feasibility of using DTE to evaluate hydrocode strength models will be discussed.
7
Prakash, Raghu V., and Deepika Sudevan. "Post-Impact Thermo-Mechanical Response of Woven Mat Composites Subjected to Tensile Loading." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-66343.
Full textAbstract:
The thermo-mechanical response of carbon fiber reinforced polymer (CFRP) laminates subjected to continuous tensile loading and programmed interrupted tensile loading is examined to understand the changes due to damage progression. Quasi-isotropic laminates were prepared using 500 GSM twill weave carbon fabric with LY 556 resin and HY 991 hardener by hand lay-up technique, followed by curing under hot compression. A few specimens were subjected to an impact loading to 23 J and 51 J energy levels using a hemispherical tip to induce low velocity impact damage. Passive thermal imaging of woven CFRP laminates during tensile testing was captured using a TIM 160 Micro-epsilon infrared thermal camera. Temperature response during tensile testing provided a good correlation with deformation mode esp. for specimens impacted with 51 J of energy. Tensile tests were interrupted at periodic loads and unloaded and reloaded to study the thermal response after prior plastic deformation damage in the specimen. Unlike the case of GFRP specimens, distinct changes in thermo-elastic slope due to prior plastic deformation damage could not be clearly identified. As impact damage resulted in de-lamination of some layers, active thermography technique was used to study the rate of cooling of specimen with time when the damage is closer to the camera face as well as when it is away from the camera face. The cooling curves obtained were found to be dependent on the location of the damage, as well as on heating face of the specimen.
8
Presby, Michael J., Nesredin Kedir, Luis J. Sanchez, D. Calvin Faucett, Sung R. Choi, and Gregory N. Morscher. "Life-Limiting Behavior of an Oxide/Oxide Ceramic Matrix Composite at Elevated Temperature Subject to Foreign Object Damage." In ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/gt2018-75852.
Full textAbstract:
The life-limiting behavior of an N720/alumina oxide/oxide ceramic matrix composite (CMC) was assessed in tension in air at 1200°C for unimpacted and impacted specimens. CMC targets were subjected to ballistic impact at ambient temperature with an impact velocity of 250 m/s under a full support configuration. Subsequent post-impact ultimate tensile strength was determined as a function of test rate in order to determine the susceptibility to delayed failure, or slow crack growth (SCG). Unimpacted and impacted specimens exhibited a significant dependency of ultimate tensile strength on test rate such that the ultimate tensile strength decreased with decreasing test rate. Damage was characterized using x-ray computed tomography (CT), and scanning electron microscopy (SEM). A phenomenological life prediction model was developed in order to predict life from one loading condition (constant stress-rate loading) to another (constant stress loading). The model was verified in part via a theoretical preloading analysis.
9
Kedir, Nesredin, David Faucett, Luis Sanchez, and Sung R. Choi. "Foreign Object Damage in an Oxide/Oxide Ceramic Matrix Composite (CMC) Under Prescribed Tensile Loading." In ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-58058.
Full textAbstract:
Foreign object damage (FOD) behavior of an N720/alumina oxide/oxide ceramic matrix composite (CMC) was characterized at ambient temperature by using spherical projectiles impacted at velocities ranging from 100 to 350 m/s. The CMC targets were subject to ballistic impact at a normal incidence angle while being loaded under different levels of tensile loading in order to simulate conditions of rotating aeroengine airfoils. The impact damage of frontal and back surfaces was assessed with respect to impact velocity and load factor. Subsequent post-impact residual strength was also estimated to determine quantitatively the severity of impact damage. Impact force was predicted based on the principles of energy conservation.
10
Kristoffersen, Martin, Tore Børvik, and Lars Olovsson. "Pipeline Fracture due to Compression-Tension Loading Caused by Foreign Object Impact." In ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/omae2018-77964.
Full textAbstract:
In areas frequented by fishing vessels, trawl equipment or anchors may interfere with pipelines and cause damage through impact, potential hooking, and ensuing release of the pipeline. This load sequence of denting followed by global bending and springback results in a complex stress and strain history. Experiments have shown that fracture in an impacted pipe typically arises along the bottom of the dent, where the material suffers high compressive strains in the impact and hooking phase, and a rapid change to tension during the rebound phase. High compressive strains may reduce the strain to failure significantly for a succeeding tensile phase. A common trait of ductile damage models is to account for damage through nucleation, growth and coalescence of voids, which traditionally is thought to occur during tension. In this study, an uncoupled phenomenological Cockcroft-Latham-type fracture model accounting for anisotropic damage is used. The fracture model is implemented in the explicit finite element programme IMPETUS Afea Solver, and calibrated using material tests. Simulations show that the proposed fracture model is able to account for the observed behaviour.
Reports on the topic "Impact tensile loading"
1
Saadeh, Shadi, and Maria El Asmar. Sensitivity Analysis of the IDEAL CT Test Using the Distinct Element Method. Mineta Transporation Institute, 2023. http://dx.doi.org/10.31979/mti.2023.2243.
Full textAbstract:
Cracking is a primary mode of failure for asphalt concrete (AC), resulting in road damage and deterioration, and leading to an increase in road hazards and fatalities. Studying the fracture behavior of AC is an effective way to learn how to best enhance their cracking resistance. To do this, the indirect tensile cracking laboratory test (IDEAL-CT) was developed and used to assess the AC cracking behavior by defining a unique index that allows the ranking of different mixes’ cracking resistance. The sensitivity of the test results to the test parameters is needed to monitor the test’s performance. Several parameters impact the result of the IDEAL-CT. This study focuses on the variation of air voids, loading rate, aggregate shape, bonding type, and gradation mix. Performing more than 450 test scenarios—varying multiple factors and conducting enough tests for each variation—would require considerable resources and time. To solve the issue, the Particle Flow Code in two-dimension software (PFC2D) using the discrete element method (DEM) is adapted to mitigate the need for actual laboratory tests. Initial findings yielded a better understanding of the micromechanical behavior of each mix, showing that air void content has more impact than loading rate; a decrease of 2% in air voids resulted in an increase of more than 50% in cracking resistance. Additionally, different aggregate sources and bonding strengths affected the cracking resistance. These results can inform further studies on AC cracking in order to reduce road damage and deterioration to keep roads safe.
2
Sanborn, Brett, and Bo Song. Investigation of Energy Dissipation Behavior in Threaded Joints Under Impact Loading Using a Kolsky Tension Bar. Office of Scientific and Technical Information (OSTI), 2017. http://dx.doi.org/10.2172/1617622.
Full text
3
Wilkowski, Gery, and Ken Bagnoli. PR-276-223814-R02 Pragmatic Application of MegaRule RIN 1-192.712 Toughness Values L2 and L3 Procedures. Pipeline Research Council International, Inc. (PRCI), 2024. http://dx.doi.org/10.55274/r0000081.
Full textAbstract:
This project addresses pragmatic application of the new DOT/PHMSA MegaRule RIN 1 - 192.712 for recommended toughness values for determining if an ILI detected axial flaw needs repair or can instead be observed for any future growth. The MegaRule toughness is expressed as the Charpy energy value, which came from Charpy test data at 50�F. However, the fracture toughness of a surface-cracked pipe is quite different than Charpy impact toughness values, especially if the Charpy data is in the brittle-to-ductile transition region. The surface-cracked pipe burst-pressure transition temperature can be greatly lower than the Charpy impact specimen transition temperature due to loading rates and constraint effects (bending versus tension loading). In cases with axial surface cracks in vintage base-metal pipe tests, the surface-cracked pipe burst pressure transition temperature was greater than 200�F lower than the Charpy transition temperature. The procedures were extended to welds, and in the Level 1 report, databases from member companies were examined to establish what Charpy energy values should be used to reflect the toughness of a surface crack in the pipe at the operating temperatures, and still be consistent with the MegaRule Charpy information and safety desires.
4
TENSILE BEHAVIOUR OF TMCP Q690D HIGH-STRENGTH STRUCTURAL STEEL AT STRAIN RATES FROM 0.00025 TO 760 S-1. The Hong Kong Institute of Steel Construction, 2022. http://dx.doi.org/10.18057/ijasc.2022.18.1.7.
Full textAbstract:
The application of Q690D high-strength structural steel (HSSS) has been increasing in engineering structures. The lack of knowledge of the strain rate behaviour limits the application to the extreme loading conditions such as blast and impact loadings. This paper presents a series of tensile tests on the dynamic tensile behaviour of Q690D HSSS produced through the thermo-mechanical control process (TMCP). The stress-strain relationships of TMCP Q690D in the strain rate range of 0.00025 to 760 s-1 were measured by using the universal and servo-hydraulic high speed testing machines. The experimental results verified the sensitivity to strain rate of TMCP Q690D and the dynamic increase factor (DIF) for yield stress is identical to that of QT (Quenched and Tempered) S690 HSSS. However, TMCP Q690D behaves in a much different way in the strain hardening stage. The commonly-used Cowper-Symonds model was calibrated for the DIFs of yield stress and ultimate tensile strength. The Johnson-Cook (J-C) model was modified and a new rate-dependent constitutive model was proposed. The proposed model was validated successfully to predict the true stress-strain relationship, providing better prediction results than the modified J-C model.