To see the other types of publications on this topic, follow the link: Crushing force.
Journal articles on the topic 'Crushing force'
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 'Crushing force.'
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
Polushyna, M. V., T. V. Moskalova, and V. F. Hankevich. "Static force analysis of a single toggle jaw crusher." Geo-Technical mechanics, no. 152 (2020): 254–62. http://dx.doi.org/10.15407/geotm2020.152.254.
Full textAbstract:
There are various recommendations in domestic and foreign literature regarding the law of distribution of the crushing load along the swing plate of jaw crushers: even, linear or nonlinear. The method of load distribution along the swing jaw affects the resultant crushing force, its application point and, therefore, the forces subjected to the jaw crusher links. A feature of a single toggle jaw crusher is the strong force exerted on the eccentric shaft since the crushing forces are directly transferred to the shaft. Therefore, it is important to determine the worst design case in order to calculate the strength of crusher parts. This article represents the static study of the influence of the application point of the crushing force on the forces acting on the eccentric shaft and the toggle plate of the single toggle jaw crusher. During the study, a kinematic scheme of the mechanism of the single toggle jaw crusher in the form of a four-link crank mechanism was worked out. The dependences of the angles of the rotation of the link on the angle of the eccentric shaft rotation of the crusher were obtained, which allowed determining the trajectories of different points of the swing jaw and the sections of the moving plate which crushed feeding material during the cycle. Static force analysis of the mechanism of a single toggle jaw crusher was carried out which made it possible to understand the mechanism of torque transmission to the links of crusher, determine the forces acting on the toggle plate and the eccentrics shaft bearings, as well as the shifting of application point position of the resultant crushing force along the swing plate during one stroke. The graphs of dependencies of the forces acting on the eccentric shaft and the toggle plate on the position of application point of the crushing load were built, which made it possible to determine the worst case for calculating the strength of crushers’ joints. It is established that maximum forces subjected to the eccentric shaft and the toggle plate occur when the crushing force is applied to the bottom zone of the moving plate. Such an application corresponds to the nonlinear distribution of the crushing load along the swing jaw.
2
Zhangfeng, Zhao, Li Yanbiao, Li Wenhao, Zhan Xian, Zhu Xingliang, and Zhong Jiang. "Research on the biaxial compound pendulum jaw crusher based on seven-bar mechanism." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 230, no. 11 (April 16, 2015): 1876–89. http://dx.doi.org/10.1177/0954406215583889.
Full textAbstract:
Traditional compound pendulum jaw crushers have many disadvantages such as low efficiency and uneven broken materials. This paper proposes a new biaxial compound pendulum jaw crusher to solve these problems. This paper presents the kinematic and dynamic performance of the new crushers, introduces its structure and layout features, derives the equations involving position, velocity, acceleration and kinetics, describes a workspace of the jaw crusher, analyzes the travel characteristic values and crushing force of movable jaw plates, and optimizes its structural and motion parameters through a multi-objective genetic algorithm. After the optimization process, the novel jaw crusher has little force on each hinge and large force on movable jaw plates. Specifically, the forces in the X-direction are 120,300 N for hinge C, 120,200 N for hinge D, and 195,000 N for hinge N; the forces in the Y-direction are 167,100 N, 162,800 N, and 197,900 N accordingly, while the breaking force of the movable jaw plate is 229,600 N. Experiments have been conducted. The results have clearly shown that the new biaxial compound pendulum jaw crusher has many advantages over conventional ones, such as the high crushing efficiency, even crushing, and large crushing force.
3
Hussein, Rafea Dakhil, Dong Ruan, Guo Xing Lu, Jeong Whan Yoon, and Zhan Yuan Gao. "Dynamic Axial Compression of Square CFRP/Aluminium Tubes." Key Engineering Materials 794 (February 2019): 202–7. http://dx.doi.org/10.4028/www.scientific.net/kem.794.202.
Full textAbstract:
Carbon fibre composite tubes have high strength to weight ratios and outstanding performance under axial crushing. In this paper, square CFRP tubes and aluminium sheet-wrapped CFRP tubes were impacted by a drop mass to investigate the effect of loading velocity on the energy absorption of CFRP/aluminium tubes. A comparison of the quasi-static and dynamic crushing behaviours of tubes was made in terms of deformation mode, peak crushing force, mean crushing force, energy absorption and specific energy absorption. The influence of the number of aluminium layers that wrapped square CFRP tubes on the crushing performance of tubes under axial impact was also examined. Experimental results manifested similar deformation modes of tubes in both quasi-static and dynamic tests. The dynamic peak crushing force was higher than the quasi-static counterpart, while mean crushing force, energy absorption and specific energy absorption were lower in dynamic tests than those in quasi-static tests. The mean crushing force and energy absorption decreased with the crushing velocity and increased with the number of aluminium layers. The impact stroke (when the force starts to drop) decreased with the number of aluminium layers.
4
Jusuf, Annisa, Fajri Syah Allam, Tatacipta Dirgantara, Leonardo Gunawan, and Ichsan Setya Putra. "Low Velocity Impact Analyses of Prismatic Columns Using Finite Element Method." Key Engineering Materials 462-463 (January 2011): 1308–13. http://dx.doi.org/10.4028/www.scientific.net/kem.462-463.1308.
Full textAbstract:
This paper presents the study of prismatic columns of different cross sections subjected to low velocity impact, which are commonly used as energy absorber components in vehicles. The impacts of the columns were numerically analyzed using FEM. Four cross sections were considered, i.e. square, hexagonal, octagonal and circular. For each cross section, columns with several combinations of perimeters and thicknesses were analyzed. The results showed that, for columns with equal perimeter and thickness, those with circular cross sections have the highest mean crushing force and those with square cross sections have the lowest crushing forces. Furthermore, keeping all other parameters constant, columns with thicker wall have significantly higher crushing force while columns with longer perimeter have only slightly higher crushing force. This parametric information will be very useful for modern automotive industry in designing front longitudinal members within an acceptable safety level.
5
Wang, X., and G. Lu. "Axial crushing force of externally fibre-reinforced metal tubes." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 216, no. 9 (September 1, 2002): 863–74. http://dx.doi.org/10.1177/095440620221600901.
Full textAbstract:
Based on the classical Alexander solution for the axial collapse of bare metal tubes, a theoretical model is presented to predict the mean crushing force of arbitrarily fibre-reinforced metal tubes with a ring collapse mode. The derived mean crushing force and length of the local folding wave are more reasonable and are in better agreement with the experiments than previously obtained. The effect of wrapping direction of the reinforcing fibres is studied. This model for predicting the static mean crushing force can be extended for the dynamic mean crushing force of fibre-reinforced metal tubes under axial impact load.
6
Wang, Wenkang, Shaoqing Shi, and Gaosheng Wang. "Comparative Study on Mechanical Properties of a Tube-Crushing Dissipator and a Symmetric Tube-Crushing Dissipator." Advances in Civil Engineering 2019 (April 3, 2019): 1–13. http://dx.doi.org/10.1155/2019/8156432.
Full textAbstract:
The tube-crushing dissipator is widely used in engineering, but it has the eccentricity problem. Therefore, a symmetric tube-crushing dissipator was proposed in this article, and quasistatic and dynamic tests were performed to compare mechanical properties of the tube-crushing dissipators and the symmetric tube-crushing dissipators. The results of the quasistatic tests show that the working force of the tube-crushing dissipators fluctuates around an average value which is about 20% smaller than the activation threshold after activation, while the working force fluctuates around an average value which is approximately equal to the activation threshold after activation. The results of the dynamic tests show that mean force at the crushing section of the tube-crushing dissipators and the symmetric tube-crushing dissipators increases with the increase of the impact velocity. Furthermore, the dynamic load-displacement curves are more volatile than those of the static tests. Therefore, dynamic tests which are more similar to the real working conditions of the dissipators are preferable over static tests. In addition, the metal tubes of the symmetric tube-crushing dissipators collapse vertically both in the quasistatic and dynamic tests; that is, the eccentricity problem of the tube-crushing dissipators is overcome by the symmetric tube-crushing dissipators.
7
JI, XU, and ERKAN OTERKUS. "Physical mechanism of ice/structure interaction." Journal of Glaciology 64, no. 244 (February 28, 2018): 197–207. http://dx.doi.org/10.1017/jog.2018.5.
Full textAbstract:
ABSTRACTTo obtain the effect of velocity and structural natural frequency (structural stiffness) on ice failure, an extended dynamic Van der Pol-based single degree-of-freedom ice/structure interaction model is developed. Three basic modes of response were reproduced: intermittent crushing, frequency lock-in and continuous crushing. Further analysis on the physical mechanism of ice/structure interaction is presented on the basis of feedback mechanism and energy mechanism, respectively. Internal effect and external effect from ice and structure were both explained in the feedback branch. Based on reproduced results, energy exchanges at different configurations are computed from the energy conservation using the first law of thermodynamics. A general conclusion on the predominant type of vibration when the ice velocity increases during the interaction process is forced, self-excited and forced in each of the three modes of responses. Ice force variations also show that there is more impulse energy during the lock-in range. Moreover, ice-induced vibration demonstrates an analogy of friction-induced self-excited vibration. Finally, the similarity between strain-stress curve and Stribeck curve shows that static and kinetic friction force variations are attributed to ice force characteristic, and can be used to explain the lower effective pressure magnitude during continuous crushing than the peak pressure during intermittent crushing.
8
Bai, Shenghe, Qizhi Yang, Kang Niu, Bo Zhao, Liming Zhou, and Yanwei Yuan. "Discrete Element-Based Optimization Parameters of an Experimental Corn Silage Crushing and Throwing Device." Transactions of the ASABE 64, no. 3 (2021): 1019–26. http://dx.doi.org/10.13031/trans.14463.
Full textAbstract:
HighlightsA discrete element simulation model was used to improve the performance of a corn silage crushing and throwing device.Feed rate, crushing speed, and dial speed were used as the test factors, and the average cutting force and average energy loss were used as the evaluation indexes in orthogonal testing.The order of significance of the factors was crushing speed > feed rate > dial speed for average cutting force and crushing speed > dial speed > feed rate for average energy loss.Abstract. To improve the performance of a corn silage crushing and throwing device and address the problems of low crushing quality and high power consumption, a discrete element simulation model of a corn silage crushing and throwing device and granular straw was established based on discrete element theory using EDEM, a general-purpose CAE software program designed with modern discrete element model technology to simulate and analyze particle processing and production operations. The average cutting force and average energy loss of the particles were the evaluation indexes, and the influence of feed rate, crushing speed, and dial speed on the evaluation indexes was analyzed using single-factor simulation tests. The order of significance was crushing speed > feed rate > dial speed for the average cutting force and crushing speed > dial speed > feed rate for the average energy loss. Using multi-objective optimization, the optimal combination of feed rate, crushing speed, and dial speed was 3.52 kg s-1, 892.06 rpm, and 1502 rpm, respectively. With the optimal parameters, the average cutting force was 58.20 N and the average energy loss was 0.85 J. To verify the feasibility of the EDEM simulation, field tests were conducted using a trial-produced device, with the acceptability of straw crushing and power consumption as the test indicators. During the field tests, the feed rate, crushing speed, and dial speed were set to 3.52 kg s-1, 890 rpm, and 1500 rpm, respectively. The field tests showed that the acceptability of straw crushing and the power consumption were 93.60% and 6.73 kW·h, respectively, with the optimal parameters, which satisfied the corn silage crushing standard and provides a theoretical and scientific basis for the design and optimization of the device. Keywords: Corn silage, Crushing and throwing device, Discrete element simulation, Motion simulation, Multi-objective optimization method.
9
Mu, Fu Sheng, Hui Li, Xing Xue Li, and Hong Zhi Xiong. "Jaw Crusher Based on Discrete Element Method." Applied Mechanics and Materials 312 (February 2013): 101–5. http://dx.doi.org/10.4028/www.scientific.net/amm.312.101.
Full textAbstract:
In order to analyze the force condition and crushing power of crusher teeth plate, the discrete element method models of jaw crusher and double-cavity jaw crusher are set up respectively using EDEM, a kind of software for discrete element analysis. Meanwhile, the working process, the loading force on the teeth plate and crushing power are simulated. The results show that: the rationality of the DEM simulation is declared, and the crushing process of the particles is also shown intuitively. The loading force condition and the crushing power of the moving jaw teeth plate serve as basis for its abrasion and energy consumption respectively.
10
Panfilova, Olga, Olga Kalinina, Olga Golyaeva, Sergey Knyazev, and Mikhail Tsoy. "Physical and mechanical properties of berries and biological features of red currant growth for mechanized harvesting." Research in Agricultural Engineering 66, No. 4 (December 30, 2020): 156–63. http://dx.doi.org/10.17221/11/2020-rae.
Full textAbstract:
The physical and mechanical parameters of berries and the morphometric features of the structure of the bush growth habit are important criteria in predicting the use of berry harvesting equipment. In this research, six red currant cultivars have been studied. The berry separation force, the crushing force, and the strength of attachment of the berries to the stalk were assigned to the physical and mechanical parameters and were determined using the "PLODTEST-1" and "Dina-2" devices (Russia). For the optimal operation of the berry harvester, the crushing force of the berries must be more than 2 N, the berry separation force must be in the range of 0.5–1.5 N. A high correlation between the separation and crushing forces was determined (R = 0.71). During the period of technical maturity, the strength of the attachment of the berries in the raceme was more than 0.5 N and, by the end of maturation, this indicator decreased. Most of the studied cultivars have a compact, optimal bush volume. The red currant cultivars Niva, Asya and Vika are promising for mechanised harvesting.
11
Vu, Mai The, Hyeung-Sik Choi, Dae Hyeong Ji, Sang-Ki Jeong, and Joon-Young Kim. "A study on an up-milling rock crushing tool operation of an underwater tracked vehicle." Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment 233, no. 1 (November 14, 2017): 283–300. http://dx.doi.org/10.1177/1475090217735934.
Full textAbstract:
In this article, we develop the analysis of a new underwater tracked vehicle with rock crushing tool, working under the water. To design the capacity of the underwater tracked vehicle actuator and the rock crushing tool actuator, we analyze the interaction forces and torque between the rock and the rock crushing tool. Since experiments on the underwater tracked vehicle with a rock crushing tool are very difficult, costly, time-consuming, we first perform a mathematical modeling of the underwater tracked vehicle with the rock crushing tool. We analyze the mechanics of the underwater tracked vehicle system that is affected by the forces and moments of the underwater rock crushing, where the force and torque on the rock crushing tool are based on the analysis of the mechanics of an individual cutter tool. We derive a mathematical expression for the forces and moments of the combined system on the underwater tracked vehicle and the rock crushing tool for rock crushing. For this, we study the parameters that affect the mechanics of the underwater tracked vehicle system with the rock crushing tool. To apply the rock crushing tool to underwater rock excavation, we also study the hydrostatic effects to the combined underwater tracked vehicle system with the rock crushing tool. To design the capacity of the actuator of the developing underwater tracked vehicle and the rock crushing tool, we analyze the required tractive or down thrust forces, and the torque to the rotor carriage caused by the cutting system. In addition, we analyze the energy and the power for the rock crushing tool actuator related to the tool characteristics. To support the validity of the analyses, we use the derived equations to perform a number of numerical simulations.
12
Kärnä, Tuomo, Yan Qu, Xiangjun Bi, Qianjin Yue, and Walter Kuehnlein. "A Spectral Model for Forces Due to Ice Crushing." Journal of Offshore Mechanics and Arctic Engineering 129, no. 2 (September 14, 2006): 138–45. http://dx.doi.org/10.1115/1.2426997.
Full textAbstract:
This paper presents a model of dynamic ice forces on vertical offshore structures. The model concerns a loading scenario where a competent ice sheet is drifting and crushing against the structure. Full scale data obtained on two offshore structures were used in the derivation of a method that applies both to narrow and wide structures. A large amount of events with directly measured local forces was used to derive formulas for spectral density functions of the local ice forces. A nondimensional formula that was derived for the autospectral density is independent of ice thickness. Coherence functions were used to define cross-spectral density functions of the local ice forces. The two kind of spectral density functions were used to obtain the spectral density of the total ice force. The method takes into account both the spatial and time correlation between the local forces. Accordingly, the model provides a tool to consider the nonsimultaneous characteristics of the local ice pressures while assessing the total ice force.
13
Polievoda, Yurii. "Investigation of the process of peeling walnuts between two parallel plates." Vibrations in engineering and technology, no. 3(94) (November 26, 2019): 110–17. http://dx.doi.org/10.37128/2306-8744-2019-3-14.
Full textAbstract:
The article provides a detailed overview of the process of splitting the kernel of a walnut. Examples of many ways to split the shell are given, all of their disadvantages and advantages are listed. The mechanical method of peeling nuts using low-frequency oscillations has been theoretically investigated and substantiated. The kinematics of the process of crushing nuts between two parallel plates has been extensively analyzed. Graphical correlations were obtained between the size of the nut shell and the dynamics of the driving force of the nut moisture. It is revealed that the process of destruction of the shell of a walnut consists of four stages, corresponding to the laws of brittle destruction. Presents: - dependence of the maximum force of crushing of a shell of a nut at 5% humidity; - the dependence of the maximum crushing force of nuts at different shell thickness for the case of horizontal positioning of the nut between two plates with perpendicular force on the surface of the joint halves of the nut; - the dependence of the maximum crushing force according to the humidity of the nuts at different shell thicknesses for the case of vertical positioning of the nut between two parallel plates with a vertical driving force; - the dependence of the maximum crushing force with the moisture of the nuts at different shell thicknesses for the case of horizontal positioning of the nut between two parallel plates with a force action along the slit. The energy of splitting (crushing) of nuts at their location in different positions between two parallel plates is also determined. Where it has been proved that the energy consumed in the process of crushing increases with the thickness of the shell of a walnut. At the same time, it is proved that energy consumption depends on the location of the nut in the process of crushing. Graph analyzes were performed to show that maximum crushing energy is recorded in the case of a horizontal arrangement of a nut with a perpendicular crack action. In this study, a large amount of information was obtained regarding the splitting of the walnut, depending on the structural and mechanical characteristics of the products, which in the process of processing are important for the determination of certain rational technological parameters.
14
Xu, Lei, Yong Wei Wang, Gui Bo Gao, Ze Peng Chu, and Kai Yu Wang. "Experimental Study on Cement Clinker Particles under Impact Force." Applied Mechanics and Materials 357-360 (August 2013): 592–96. http://dx.doi.org/10.4028/www.scientific.net/amm.357-360.592.
Full textAbstract:
In order to further study the impact crushing mechanism of cement clinker, the impact experiment has been carried out at different impact angles. Impact crushing curves, acoustic emission signal and peak impact force and impact fracture morphology have been systematically studied. It is shown that each impact crushing curve includes an inertia peak and an actual impact peak. AE signal directly reflects the crack initiation and propagation during the process of impact experiment. With the increase of impact angle, the average value of peak impact force decreases. The peak impact force value reaches the minimum at 75 °. The experiment results will offer a successful alternative to the low – energy grinding of cement clinker.
15
Niu, Yiran, Lin Li, Yanwei Zhang, Shicai Yu, and Jian Zhou. "Micromechanism of the Breakage of Two Spherical Gypsum Particles under Normal–Tangential Contact Conditions." Applied Sciences 11, no. 9 (April 29, 2021): 4039. http://dx.doi.org/10.3390/app11094039.
Full textAbstract:
Contact breakage of particles makes a large difference in the strength of coarse-grained soils, and exploring the characteristics within the process of the breakage is of great significance. Ignoring the influence of particle shape, the micromechanism of two spherical particles breaking under normal–tangential contact conditions was investigated theoretically and experimentally. Through theoretical analysis, the breakage form, the shape and size of the conical core, and the relationship between the normal and tangential forces at crushing were predicted. Particle contact tests of two gypsum spheres were carried out, in which the breakage forms, features of the conical cores and the normal and tangential forces at crushing were recorded for comparison with the predicted values. The test results and the theoretical predictions showed good agreement. Both the analysis and test demonstrate that the presence of tangential forces causes the conical core to assume the shape of an oblique cone, and the breakage form to change. Moreover, with increasing normal contact force, the tangential force needed for crushing increases gradually first and then decreases suddenly.
16
Wang, Cheng‐long, Yifang Chen, QingLiang Zeng, and Guoming Liu. "Simulation and Experiment of a Kind of Thin-Walled Tube Crushing Member Used for Antiimpact Column." Shock and Vibration 2021 (May 17, 2021): 1–12. http://dx.doi.org/10.1155/2021/6624934.
Full textAbstract:
In order to solve the problem of poor antiimpact ability of hydraulic support under rock bursting, a kind of thin-walled cylinder crushing component used in the composite spiral antiimpact device was developed, and different structural models were proposed and simulated. On this basis, the model was verified by experiments. The results show that the arrangement of the hollow structure can restrain the ring mode deformation and Euler instability of the tube member in the crushing yield and can carry out the buckling deformation according to the expected crushing force during the compression deformation process and effectively reduce the initial peak force. The arrangement of guide grooves can make the buckling deformation more stable and regular, which can effectively reduce the initial peak force and elastic displacement. With the smaller wall thickness and the smaller wall thickness of the induced groove, the effective deformation yield stroke of the crushing member increases, and the initial peak force, total energy absorption, average reaction force, and elastic displacement decrease. The simulation results are consistent with the experimental results which will be used in the future works.
17
Nordgren, R. P., and M. M. Winkler. "Dynamic Ride-Up and Crushing of Short Ice Ridges on Conical Structures." Journal of Offshore Mechanics and Arctic Engineering 113, no. 1 (February 1, 1991): 70–73. http://dx.doi.org/10.1115/1.2919899.
Full textAbstract:
An analysis is presented for the plane motion of an ice ridge being pushed up a faceted conical structure by a floe moving at constant velocity. The effect of crushing of the ridge against the rigid structure is included by means of an idealized crushing model. The effect of changing buoyancy is included in the analysis. The plane, rigid-body equations of motion are solved numerically for finite displacement and rotation of the ridge. A quasi-static flexural model is used to determine conditions for failure of the ridge in lengthwise bending. Numerical results for a typical problem are presented and discussed. The impulsive-type contact force at initial impact depends strongly on impact velocity and ice-crushing strength. However, the maximum force on the structure usually occurs later after the ridge has ridden up on the structure. This force is nearly independent of velocity. For realistic crushing strengths, the maximum force is significantly lower than in our previous static analysis of ridge ride-up without crushing. With consideration of lengthwise flexural failure, the dynamic ride-up model is applied to the development of design loads for a 40-deg conical structure.
18
Chanh Nghia, Nguyen, Tatacipta Dirgantara, Sigit P. Santosa, Annisa Jusuf, and Ichsan Setya Putra. "Impact Behavior of Square Crash Box Structures Having Holes at Corners." Applied Mechanics and Materials 660 (October 2014): 613–17. http://dx.doi.org/10.4028/www.scientific.net/amm.660.613.
Full textAbstract:
In this paper, an analytical prediction and numerical simulation of the behavior of square crash box structures having hole at corners on dynamic axial crushing are studied. The focus of the present theoretical prediction is to calculate the mean crushing force and maximum crushing force during the folding process subjected to axial impact loading. Then, the effect of hole size to the crushing response of square crash box structures was also evaluated. For validation, an explicit non-linear commercial finite element code LS-DYNA was used to predict the response of the structures subjected to axial crushing. It was found that results of numerical method and theoretical prediction were in good agreement. The results showed that, by inserting holes at corners, the folding can be controlled to be always started from the hole, and peak crush load on the first fold can be reduced significantly. Meanwhile, the decreasing of mean crushing force is insignificant compared to the one without holes. Hence, the characteristic of impact energy absorption in a progressive buckling can be improved, the damage in passenger compartment can be minimized, and the deceleration level can be kept in safe level to prevent injury of the passenger.
19
Ciężkowski, Paweł, Jan Maciejewski, Sebastian Bąk, and Arkadiusz Kwaśniewski. "Application of The New Shape Crushing Plate in Machine Crushing Processes." Studia Geotechnica et Mechanica 42, no. 1 (March 19, 2020): 83–96. http://dx.doi.org/10.2478/sgem-2019-0029.
Full textAbstract:
AbstractThe results of studies of the crushing process in a double toggle jaw crusher are presented. This process was carried out on six sets of crushing plates. The first three of them are used in industrial crushers – plates with a flat working surface and a triangular profile (in this work, under consideration were profiles with teeth angle γ = 90°). The fourth and fifth type refer to plates with a variable pitch t and teeth height with a triangular shape of the teeth. In the sixth solution, plates with variable pitch and width of the wedged teeth are proposed.The results of the basic process parameters are shown, that is, average degree of fineness n, technical performance Wt, crushing energy L and crushing force F, sieve analysis of crushing product. The obtained results are the basis for the assessment of the suitability of various types of plates, especially plates with a new profile, which have an altered shape in comparison with the plates used in crushers so far.The crushing tests were carried out with the same dimension of outlet slot er = 24 mm, close to the pitch size for plates with triangular profile. Tests were performed on the “Mucharz” sandstone. Samples from a series of blocks of different size and geometric shape were prepared. This work also presents feed mass influence on crushing process efficiency.The plates with variable pitch and width of teeth are beneficial because of lower crushing force and energy.
20
Malekshahi, Ahmad, Kourosh Heidari Shirazi, Mohammad Shishesaz, and Mohammad Hosseini. "A Novel Theoretical Approach for Estimation of Axial Crushing Behavior of Polygonal Hollow Sections." International Journal of Applied Mechanics 12, no. 01 (January 2020): 2050008. http://dx.doi.org/10.1142/s1758825120500088.
Full textAbstract:
The aim of the present study was to introduce new crushing mechanisms in terms of crushing modes for estimating the crushing force and absorbed energy of polygonal thin walled metal sections subjected to axial progressive collapse. For this purpose, two models were developed. The first model, which has been extensively used before and named as “plastic hinge model” (PHM), was modified based on new crushing modes; and as the second, a novel model was introduced by the authors named as “induced curvature model” (ICM). The latter model was considered to be more realistic than the former due to consideration of metal sheet curvatures during progressive folding process, as well as including the hardening effect of the material during plastic deformation. All possible crushing modes for a typical polygonal section were considered and discussed by combining different crushing modes of the corner elements. New expressions for the absorbed energies and crushing force were presented based on the resulting crushing modes. To evaluate the validity and efficiency of the proposed models, a detailed FE simulation was conducted using LS-DYNA. Comparison of FEM, PHM and ICM results showed the superiority of the ICM over PHM.
21
A, Praveen Kumar, Afdhal Akbar, Annisa Jusuf, and Leonardo Gunawan. "Significance of material constitutive model and forming parameters on the crashworthiness performance of capped cylindrical tubular structures." Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 234, no. 2 (November 19, 2019): 320–34. http://dx.doi.org/10.1177/1464420719887408.
Full textAbstract:
An accuracy of crushing performance indicators is critical to evaluate in finite element crushing simulations particularly for the press-formed capped tubular energy absorbing structures. It is essential to select the appropriate material constitutive model and to incorporate the forming parameters into the finite element crushing model as a vital input. Hence in the present article, the influence of various material constitutive models and forming (multi-stage deep drawing) parameters on the axial crashworthiness characteristics of thin-walled capped cylindrical tubes were investigated numerically. Both forming and crushing simulations were executed by nonlinear finite element LS-DYNA® code. The forming parameters such as thickness distribution, residual stress, and effective plastic strain were mapped to a finite element crushing model of the tube. The numerical predictions of the thickness distribution and final deformed profiles of the capped cylindrical tubes are correlated with the experiments. The results revealed that the forming parameters have a substantial effect on the crushing performance of the deep drawn capped cylindrical tubes. As a result of these analyses, the thickness and strain predictions strengthens the tube and significantly influenced the crushing performance indicators such as initial peak crushing force, mean crushing force, and the energy absorbing capacity.
22
Kujala, Pentti. "Modelling of the ice-edge failure process with curved failure surfaces." Annals of Glaciology 19 (1994): 158–64. http://dx.doi.org/10.3189/1994aog19-1-158-164.
Full textAbstract:
The failure process of a Wedge-shaped ice edge is modelled by dividing the process in crushing failures at the contact and flaking failures initiating from high pressure in the contact. This type of approach has been shown earlier by Daley to give an explanation of the physical background of the line-like contact observed in ice-crushing tests and in full-scale measurements. Daley's model is developed further by studying the stress field in ice in more detail when applying the Coulomb macroscopic failure criterion to determine the force required for flaking failures. The analysis indicates that the shape of the flaking failure surface to minimise the force required to cause failure follows a logarithmic spiral. The shape of the spiral is related to the inner friction angle of ice and to the geometry of the ice edge. The curved flaking surfaces require considerably less force than straight surfaces used previously, especially with wide wedge angles. Finally, the model developed is used to simulate the time history of a crushing force measured in laboratory crushing tests and a good correspondence is obtained.
23
Kujala, Pentti. "Modelling of the ice-edge failure process with curved failure surfaces." Annals of Glaciology 19 (1994): 158–64. http://dx.doi.org/10.1017/s0260305500011150.
Full textAbstract:
The failure process of a Wedge-shaped ice edge is modelled by dividing the process in crushing failures at the contact and flaking failures initiating from high pressure in the contact. This type of approach has been shown earlier by Daley to give an explanation of the physical background of the line-like contact observed in ice-crushing tests and in full-scale measurements. Daley's model is developed further by studying the stress field in ice in more detail when applying the Coulomb macroscopic failure criterion to determine the force required for flaking failures. The analysis indicates that the shape of the flaking failure surface to minimise the force required to cause failure follows a logarithmic spiral. The shape of the spiral is related to the inner friction angle of ice and to the geometry of the ice edge. The curved flaking surfaces require considerably less force than straight surfaces used previously, especially with wide wedge angles. Finally, the model developed is used to simulate the time history of a crushing force measured in laboratory crushing tests and a good correspondence is obtained.
24
Isaac, Chukwuemeke William. "Crushing response of circular thin-walled tube with non-propagating crack subjected to dynamic oblique impact loading." International Journal of Protective Structures 11, no. 1 (May 14, 2019): 41–68. http://dx.doi.org/10.1177/2041419619849087.
Full textAbstract:
The dynamic oblique crushing of circular thin-walled tubes with the presence of non-propagating crack was investigated numerically. The material considered was strain rate sensitive with crack located at the distal end of the tube. Major crashworthiness parameters were obtained and the analysis of the structural response for idealized and finite element crushed thin-walled tubes was also carried out. The study shows that crack initiation on energy absorbing tubes increase their crushing force efficiency under oblique impact, decrease their crushing force efficiency under axial impact and reduce their crashworthiness performance such as the energy absorption capacity and specific energy absorption under axial and oblique impact. Results of the crashworthiness parameters, deformation modes, damage morphology, stress–strain relations, absorption energy characteristics and crushing force-displacement history were obtained. Furthermore, the numerical study reveals both the desirable and undesirable consequence of crack on the overall crashworthiness performance of energy absorbing circular thin-walled tubes.
25
Yang, Zhibo, Wang Sun, Dongyu He, Daocheng Han, Wei Wang, Qiang Guo, and Yanru Zhang. "Effect of laser-assisted ultrasonic vibration dressing parameters of a cubic boron nitride grinding wheel on grinding force, surface quality, and particle morphology." REVIEWS ON ADVANCED MATERIALS SCIENCE 60, no. 1 (January 1, 2021): 691–701. http://dx.doi.org/10.1515/rams-2021-0054.
Full textAbstract:
Abstract In this article, the laser-assisted ultrasonic vibration dressing technique was applied to the cubic boron nitride (CBN) grinding wheel to study the effect of various process parameters (namely, laser power, dressing depth, feed rate, and grinding wheel speed) on the grinding force, surface quality, and morphological evolution of CBN abrasive particles. The results showed that abrasive particles’ morphology mainly undergoes micro-crushing, local crushing, large-area crushing, macro-crushing, and other morphological changes. The dressing force can be effectively reduced by controlling the dressing process parameters. Besides, grinding tests are performed on the grinding wheel after dressing to reveal specimens’ surface quality. Excellent grinding characteristics and grinding quality of the grinding wheel were obtained by the proposed technique with the optimized process parameters.
26
Cheng, Xiang Wen, and Hong Tao Xi. "Analysis Calculation on Single-Tooth Roll Mobile Crusher Mechanics Model." Applied Mechanics and Materials 105-107 (September 2011): 2149–52. http://dx.doi.org/10.4028/www.scientific.net/amm.105-107.2149.
Full textAbstract:
Using the second crushing theory and combining with the single-tooth rolling mobile crusher mechanism analysis, a single-tooth rolling mobile crusher mechanical model was established. Through analysis of force on the tooth roller, deduced calculation formulas of the teeth roll tangential force, the tangential force by an example calculation was more accurate.Through the analysis of the whole crushing process, the process can be divided into three kinds of condition to analysis of roller teeth force, the roller teeth mechanics model was established under this three kind condition.
27
Nedomová, Šárka, Jan Trnka, Pavla Stoklasová, and Jaroslav Buchar. "Strength of coffee beans under static and dynamic loading." Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis 61, no. 3 (2013): 743–49. http://dx.doi.org/10.11118/actaun201361030743.
Full textAbstract:
Paper deals with experimental research on the crushing of coffee beans of different kinds under quasi-static and dynamic compression. The process of the crushing is described in details. It has been shown that there is variability in the crushing strength values. A relation between crushing strength and the coffee grain shape is also studied. Roasted Arabica coffee (Coffea arabica) beans were used for analyses. Arabica coffees were produced in different countries. All Arabica samples were submitted to a light roast. The detail analysis of the experimental data shows that there is no significant relation between parameters describing the fracture behaviour of the grains and grain geometry. These parameters are also independent on the grain weight. Compression of the coffee grains leads to their crushing. The fracture force is different for the different kinds of the coffee. The same is fact valid also for the strain at the fracture and for the energy absorbed during the grain crushing. Dynamic loading leads to the increase in the fracture force of coffee grains in comparison with the quasi static loading.
28
Dirgantara, Tatacipta, Leonardo Gunawan, Ichsan Setya Putra, Sahril Afandi Sitompul, and Annisa Jusuf. "Numerical and Experimental Impact Analysis of Square Crash Box Structure with Holes." Applied Mechanics and Materials 393 (September 2013): 447–52. http://dx.doi.org/10.4028/www.scientific.net/amm.393.447.
Full textAbstract:
Numerical and experimental study of the effects of center holes located at opposite sides on dynamic axial crushing of thin-walled square aluminum extrusions column are presented in this paper. The results showed that, by inserting the holes, the impact energy absorption characteristic in a progressive buckling can be improved as the starting location of the plastic deformation is always from holes and peak crush force can be decrease, so that the deceleration does not exceed the limit that can injure the passenger when frontal impact occurs. Here, the results of numerical simulations, conducted using an explicit finite element code, are compared with experimental results for various hole diameter. The results shows that the peak crushing force is decrease, while the mean crushing force is relatively constant.
29
Putra, I. S., T. Dirgantara, L. H. Anh, Hiroomi Homma, and Kikuo Kishimoto. "Behavior of Thin-Walled Square Tube and Tubular Hat Sections Subjected to Low Velocity Impact Loading." Advanced Materials Research 33-37 (March 2008): 387–94. http://dx.doi.org/10.4028/www.scientific.net/amr.33-37.387.
Full textAbstract:
In this paper, the prediction and comparison of the behavior of thin-walled prismatic structures (square tube, top-hat and double-hat sections) in absorbing energy using theoretical and numerical analysis are presented. Equations to predict crushing length and dynamic mean crushing force of top-hat and double-hat sections were applied for material mild steel St37 and the effect of spot weld positions are also figured out. For comparison, an explicit non-linear commercial finite element code LS-DYNA was used to predict the response of the structures subjected to axial crushing. It was found that results of numerical methods and theoretical prediction have good agreement. Assuming that the failure of spot-weld is neglected, mean dynamic crushing force of double-hat section is 90% higher compared to that of square tube.
30
Liu, Li, and Zhang. "Analysis of Offshore Structures Based on Response Spectrum of Ice Force." Journal of Marine Science and Engineering 7, no. 11 (November 14, 2019): 417. http://dx.doi.org/10.3390/jmse7110417.
Full textAbstract:
With the development of large-scale offshore projects, sea ice is a potential threat to the safety of offshore structures. The main forms of damage to bottom-fixed offshore structures under sea ice are crushing failure and bending failure. Referred to as the concept of seismic response spectrums, the design response spectrum of offshore structures induced by the crushing and bending ice failure is presented. Selecting the Bohai Sea in China as an example, the sea areas were divided into different ice zones due to the different sea ice parameters. Based on the crushing and bending failure power spectral densities of ice force, a large amount of ice force time-history samples are firstly generated for each ice zone. The time-history of the maximum responses of a series of single degree of freedom systems with different natural frequencies under the ice force are calculated and subsequently, a response spectrum curve is obtained. Finally, by fitting all the response spectrum curves from different samples, the design response spectrum is generated for each ice zone. The ice force influence coefficients for crushing and bending failure are obtained, which can be used to estimate the stochastic sea ice force acting on a structure conveniently in a static way. A comparison of the proposed response spectrum method with the Monte Carlo method by a numerical example shows good agreement.
31
Bogomolova, Natalia, Svetlana Rezvyakova, and Maxim Lupin. "Study of Density of Raspberry Fruits in View of Mechanized Harvesting." E3S Web of Conferences 247 (2021): 01045. http://dx.doi.org/10.1051/e3sconf/202124701045.
Full textAbstract:
The paper discusses the possibility of combining large-fruits and density of raspberries as one of the main and decisive limiting indicators of the suitability of varieties for mechanized cultivation and further harvesting, as well as for long-term transportation to the consumer. The objects of research were 20 raspberry varieties and 15 elite forms from controlled crossings and populations from free pollination. The annual assessment of the density of raspberries was carried out at the collection and selection plots during the period of active fruiting (June-July-August) 2019-2020. From each variety sample, 10 berries were taken at full maturity. The berry crushing force was determined using the fruit test device. The climatic conditions of the study periods were rich in contrast, which indicates the instability of climatic factors of the summer growing season. This made it possible to fairly objectively evaluate the collection and breeding material in terms of the size and density of raspberries. Assessing the crushing force of collection and elite forms of raspberries made it possible to identify varieties having the increased fruit density. Rannyaya Zarya, Lyachka and Lazarevskaya have a relatively large (3.5-4.5 g) and dense berry with a crushing force of 7.6-8.4 N. The interesting elite forms are 9-58; 9-27; 9-20 with a berry mass of 3.8-4.0 g and a crushing force of 7.3-9.7-N. The crushing force of fruits of these elite forms during the study period was not lower than 5.0 N, but sometimes it was significantly influenced by soil and air moisture, which negatively affected the commercial qualities of berries.
32
Yurii, Polievoda. "Features of realization of process of peeling of a nut shell between a plate and a spherical insert." Vibrations in engineering and technology, no. 4(95) (November 20, 2019): 93–99. http://dx.doi.org/10.37128/2306-8744-2019-4-12.
Full textAbstract:
The profitability of walnut cultivation and processing was investigated in the paper, both on small farms and large agricultural enterprises. The demand for walnuts in Ukraine and abroad was investigated. Theoretical studies of the dynamics of nut crop growth in the territory of our country were conducted. The tendency to increase domestic production of walnuts in the future is established. Among the most important areas of the organization of the process of purification of this raw material is noted the process of chopping (crushing) of its shell. Applying a constructive implementation of a vibrating machine «GMK-350» for the process of mechanical cleavage of the shell of a walnut were carried out studies of the influence of the working body (plate and spherical insert) on the technological and energy parameters of the process taking into account the quality of the processed product (the integrity of the core). The article analyzes the process of shelling of walnuts between the plate and the spherical insert. Graphical correlations between the size of the shell deformation and the dynamics of change of the driving force of change at different nut humidity and shell thickness are analyzed. The scheme of driving forces in the area of contact between the nut and the ring is drawn up and analyzed. The graphical dependences of the maximum crushing force on the bevel of the rings according to different shell thickness are presented; variations of the maximum crushing force depending on the humidity of the nuts for different thicknesses of the nut shell. It is established that, theoretically, the coefficient of friction increases as the angle of inclination of the ring increases. It is established that the crushing force of a walnut shell depends less on the friction coefficient and more on the contact surface.
33
Zheng, Wen Xiang, Ming Sun, and Wan Dong Han. "Experimental Research on Critical Force of Crushing and Sorting Coal Mine Gangue." Applied Mechanics and Materials 329 (June 2013): 26–30. http://dx.doi.org/10.4028/www.scientific.net/amm.329.26.
Full textAbstract:
First, The pressure test on two actual coal mine irregular and different particle sizes of coal and gangue, through the experimental data, using MATLAB software to give a graphic simulation and assumptions test of normal distribution, by the graphics and hypothetical test confirmed that coal and gangue had obvious demarcation, namely the critical force of crushing and storing coal gangue. In a coal mine as an example,and acquisiting more irregular and different particle sizes of coal and gangue were broken by static experiments and dynamic crushing experiment, using the experimental data obtained pressure distribution and pressure distribution curve equation,by equation to solve the crushing critical force FL of the size of 50-90mm coal and gangue,through mathematical and graphical analysis proved the rationality of FL,and providing a basic data for the future work.
34
Rebach, Steve, Jeffrey Block, and Gurbax Singh. "MEASUREMENT OF THE CRUSHING FORCE OF THE CRAB CLAW." Crustaceana 73, no. 5 (2000): 633–37. http://dx.doi.org/10.1163/156854000504606.
Full text
35
Ismail, Mohd Azizan, and Al Emran Ismail. "Crushing Behaviour of Empty Steel Tubes under Eccentric Loading." Advanced Materials Research 1087 (February 2015): 16–19. http://dx.doi.org/10.4028/www.scientific.net/amr.1087.16.
Full textAbstract:
This present paper describes numerically the tube responses subjected to eccentric loading using ANSYS finite element program. According to literature review, tremendous amount of works available on discussing the axial crushing of empty tube under axial loading. However, lack of work related with the crashworthiness aspect of tube crushing under eccentric loading was identified. Therefore, the eccentric compressive loading on the empty tubes were focused. There have important parameters were studied such as the eccentric loading. According to the present result, the behaviour of crashworthiness expected to increase when the increment of eccentric loading was introduced. The crashworthiness behaviour and energy absorption capabilities demonstrated efficiently by the collected data mean crushing force and peak crashing force.
36
Wang, Xi, Chen Jubing, and Dan Guo. "Dynamic crushing force of rotational ellipsoidal composite shells-filled foam." Journal of Reinforced Plastics and Composites 39, no. 5-6 (October 8, 2019): 193–208. http://dx.doi.org/10.1177/0731684419876987.
Full textAbstract:
This paper presents an analytical method to solve the dynamic crushing force and collapse characteristics of rotational ellipsoidal composite-reinforced metal shells with foam filler. The collapse model is firstly simulated by means of finite element calculation. Then, the feasibility of the analytical method is proved by a comparison with the finite element simulate. In example calculations, effects of some key parameters on the dynamic crushing force of rotational ellipsoidal composite-reinforced metal shells with foam filler are described and discussed. Results obtained can be used as a valuable reference for the design of protective structures resisting impact loads.
37
Deepak, B. B. V. L., and M. V. A. Raju Bahubalendruni. "Numerical analysis for force distribution along the swing jaw plate of a single toggle jaw crusher." World Journal of Engineering 14, no. 3 (June 12, 2017): 255–60. http://dx.doi.org/10.1108/wje-07-2016-0025.
Full textAbstract:
Purpose The purpose of this research work is helpful for recognizing the crushing characteristics of a single toggle jaw crusher during its operation. It is useful for designing a new prototype of this kind of machine with optimal dimensions of the jaw crusher frame and the crushing chamber. Design/methodology/approach The efficiency of the jaw crusher primarily depends on the kinematic characteristics of the swing jaw plate during the crushing process. The present research work deals with the kinematic analysis of the swing jaw plate of a single toggle jaw crusher. Findings During the analysis, the system is considered as a four-bar crank rocker mechanism. The force distribution is analyzed based on the results obtained from the motion analysis of the swing jaw plate. Originality/value The movement of the swing jaw plate is explained in detail while the machine is in operation. Kinematic analysis of the liner has been performed by considering some points along the swing jaw plate. The results obtained from the movement analysis of the swing jaw plate force distribution along the liner are analyzed. From this analysis, the chamber geometry can be optimized according to the requirement for the crushing motion of different zones in the crushing chamber.
38
Le Sourne, Hervé, Nicolas Besnard, Cedric Cheylan, and Natacha Buannic. "A Ship Collision Analysis Program Based on Upper Bound Solutions and Coupled with a Large Rotational Ship Movement Analysis Tool." Journal of Applied Mathematics 2012 (2012): 1–27. http://dx.doi.org/10.1155/2012/375686.
Full textAbstract:
This paper presents a user-friendly rapid prediction tool of damage to struck and striking vessels in a ship collision event. To do this, the so-called upper bound theorem is applied to calculate internal forces and energies of any substructure involved in the ships crushing process. At each increment of indentation, the total crushing force is transmitted to the external dynamics MCOL program, which calculates the global ship motion correction by solving the hydrodynamic force equilibrium equations. As a first step, the paper gives a brief description of the upper bound method originally developed for perpendicular collisions and recently enhanced for oblique ones. Then, the theory developed in MCOL program for large rotational ship movements is detailed. By comparing results obtained with and without MCOL, the importance of hydrodynamic effects is highlighted. Some simulation results are compared with results provided by classical nonlinear finite element calculations. Finally, by using the developed analytical tool, which mixes internal and external dynamics, different crushing scenarios including oblique collisions are investigated and the influence of some collision parameters like longitudinal and vertical impact location, impact angle, and struck ship velocity is studied.
39
Chakule, Rahul, Supriya Patil, and Poonam Talmale. "Design and Development of Can Crushing Machine." Asian Journal of Engineering and Applied Technology 9, no. 1 (May 5, 2020): 25–28. http://dx.doi.org/10.51983/ajeat-2020.9.1.1082.
Full textAbstract:
A can crusher machine is used to crush the cans for storing in bin efficiently. The crushing of cans plays a significant role in economy and ultimately helps to society. The process of cans crushing is also human and environment friendly. From literature studies it was learnt that the existing cans crushing machines are automated and can overcome the limitation of manually crushing but cost of automated cans crushing machine is high. In present study, the can crusher machine is developed economically which is automatic and eco-environment friendly. The experiments were conducted for finding the optimal pressure and force values required for effectively crushing the cans. This work helps to increase the storing capacity of cans for user. Thus, transportation cost reduces significantly due to process improvement efficiency.
40
Khakhali, A., A. Darvizeh, A. Masoumi, N. Nariman-Zadeh, and A. Shiri. "Robust Design of S-Shaped Box Beams Subjected to Compressive Load." Mathematical Problems in Engineering 2010 (2010): 1–18. http://dx.doi.org/10.1155/2010/627501.
Full textAbstract:
In order to design the automotive components considering probabilistic uncertainties in the decision variables, it is desired to perform a robust design process. The peak crushing force of the energy absorber components is one of the important objectives of the design of such components. In this paper, at first, the peak crushing force of the S-shaped box beams, as a highly simplified model of front member of a vehicle body, is extracted mathematically. Using such obtained mathematical model and Monte Carlo simulation, genetic algorithm is then used for the robust design of the S-shaped box beams having probabilistic uncertainties in material and geometrical parameters. In this way the variance-per-mean ratio of the peak crushing force () is considered as the objective function. It is shown that some interesting relationships as useful robust design principles involved in the performance of the S-shaped box beams can be discovered by the robust design of the obtained mathematical model.
41
Li, Weiwei, Changliang Lai, and Hualin Fan. "Combination of Taper and Hierarchy to Improve Crushing Efficiency of Thin-Walled Tubes." International Journal of Applied Mechanics 10, no. 08 (September 2018): 1850092. http://dx.doi.org/10.1142/s1758825118500928.
Full textAbstract:
To improve the energy absorption capacity of thin-walled tubular structures and simultaneously reduce their initial peak force (IPF), hierarchical hexagonal tapered tube (HHTT) is proposed combining advantages of the hierarchical hexagonal tube (HHT) and the tapered tube (TT), for HHTs can greatly improve the mean crushing force (MCF) while TTs can reduce the IPF. Crushing behaviors of HHTTs under quasi-static compression are investigated through numerical simulations and theoretical analyses. According to the folding modes, a theory to predict the MCF of the HHTT is proposed. According to the research, it is found that the combination of hierarchy and tapering improves the MCF of the tubular structure and the crushing force efficiency (CFE), defined by the ratio of the MCF to the IPF. It is also found that increasing the tapered angle, the wall thickness and the cell number of the lattice wall can effectively improve the CFE of the HHTT.
42
Mitchell, S. C., S. M. Kennedy, P. J. Williams, and M. E. DeMont. "Morphometrics and estimates of force generation by the chelae of a North American population of the invasive green crab, Carcinus maenas (L.)." Canadian Journal of Zoology 81, no. 2 (February 1, 2003): 203–15. http://dx.doi.org/10.1139/z02-236.
Full textAbstract:
The European green crab, Carcinus maenas, is an invasive species in eastern North America and has the potential to significantly impact wild and aquaculture shellfish in the southern Gulf of St. Lawrence, Canada. To examine potential predation effects on local shellfish and assess the appropriateness of extrapolating results from studies conducted elsewhere, the morphometry of chelae from a recently established population of C. maenas in Nova Scotia was examined for comparison with the presumed founding (European) population, and forces generated by the chelae over a range of crab sizes were estimated. The Nova Scotia population was found to be morphologically very similar to European populations with respect to chela structure. Force generation by the chelae was found to scale with isometry in the female crab and with positive allometry in the male. Estimated forces compare well with previously reported forces, and force generation is calculated to increase in a nonlinear manner proceeding from the chela tips proximally toward the fulcrum. The calculated forces generated by the chelae are clearly sufficient for outright crushing of some shells (e.g., Mya arenaria), even for small crabs, but appear to be too low for crushing those of other molluscs. There is a complex interplay between gape and maximum force along the length of the dactyl that allows great variability in force application, and thus also in the size of prey consumed and prey-handling behaviour. We suggest that for such a lever system, the gape angle of the chelae, which does not change with crab size, is optimal with respect to the resultant force generated.
43
TAMURA, Yuki, and Takabumi FUKUDA. "S171025 Consideration on consequence of crushing accident : Trial of measurement of force at crushing accident in machinery." Proceedings of Mechanical Engineering Congress, Japan 2013 (2013): _S171025–1—_S171025–3. http://dx.doi.org/10.1299/jsmemecj.2013._s171025-1.
Full text
44
Hou, Shujuan, Lili Ren, Duo Dong, and Xu Han. "Crashworthiness optimization design of honeycomb sandwich panel based on factor screening." Journal of Sandwich Structures & Materials 14, no. 6 (May 28, 2012): 655–78. http://dx.doi.org/10.1177/1099636212445057.
Full textAbstract:
This paper presents a crashworthiness robust optimization design of aluminum honeycomb sandwich panel with regular hexagonal core cell based on explicit finite element analysis. First, the crashworthiness of honeycomb sandwich panel and the bare honeycomb core are compared with each other in the aspects of specific energy absorption and peak crushing force. The comparative results show that honeycomb sandwich panel can absorb more energy than the bare honeycomb core, though the peak crushing force of honeycomb sandwich panel is larger. Then the factor screening experiments are carried out to find out variables that have significant effects on the crashworthiness of honeycomb sandwich panel. The ultimate purpose of factor screening experiments is to decrease the computational expense by reducing the number of design variables. Finally, the dual response surface method and the crossed array design are employed to formulate the complex robust optimization design problem. The regression expressions of specific energy absorption and peak crushing force are defined as the objective and constraint function respectively in the robust design of crashworthiness optimization.
45
Liu, Xiaohui, Ping Tang, Qi Geng, and Xuebin Wang. "Effect of Abrasive Concentration on Impact Performance of Abrasive Water Jet Crushing Concrete." Shock and Vibration 2019 (March 6, 2019): 1–18. http://dx.doi.org/10.1155/2019/3285150.
Full textAbstract:
It has been found that the impact performance of water jets can be changed by its properties, which include pressure, additive, and mode of jet. Thus, an abrasive water jet (AWJ) has been developed as a new method. However, there is little research on the effect of abrasive concentration on the impact performance of abrasive jets. Thus, the SPH method is used to establish an abrasive water jet crushing concrete model to study the effect of abrasive concentration on the impact force, concrete internal energy, abrasive particle distribution, crushing depth, and damage and crushing efficiencies under different concrete compressive strengths and abrasive densities. The results indicate that there is little effect of the abrasive concentration on the peak impact force under different compressive strengths and abrasive densities, while the mean impact force tends to increase linearly with the abrasive concentration. The internal energy of the concrete increases stepwise with the abrasive concentration under different compressive strengths and abrasive densities. The concentration of 10%∼20% is the rapid increasing stage. The crushing depth and damage efficiencies are all maximum at a concentration of 20% under different compressive strengths and abrasive densities. After the concrete was impacted by the water from the water jet, it is divided into rebounding particles and intrusive particles. The more the intrusive particles, the easier the concrete to be crushed and damaged.
46
Han, Jing, and Koetsu YAMAZAKI. "Minimization of Axial Crushing of Triangulated Cylinders by Twisting Force." Proceedings of The Computational Mechanics Conference 2000.13 (2000): 517–18. http://dx.doi.org/10.1299/jsmecmd.2000.13.517.
Full text
47
Rogala, M., and J. Gajewski. "Numerical analysis of porous materials subjected to oblique crushing force." Journal of Physics: Conference Series 1736 (January 2021): 012025. http://dx.doi.org/10.1088/1742-6596/1736/1/012025.
Full text
48
Ahmed, Naveed, Pu Xue, and Naeem Zafar. "Dynamic axial crushing of bitubular tubes with curvy polygonal inner-tube sections." International Journal of Computational Materials Science and Engineering 06, no. 03 (September 2017): 1750024. http://dx.doi.org/10.1142/s2047684117500245.
Full textAbstract:
Bitubular structural configurations, where the outer tube is circular, square and curvy square in shape while the inner-tube section is curvy triangular, square and hexagonal in different proposed configurations, are numerically crushed under dynamic axial loading. The crashworthiness effectiveness for changing inner-tube polygonal cross-section for each of the outer tube sections is studied and compared with changing outer tube shape. The deformation plots and energy absorption (EA) parameters such as peak crushing force (PCF) mean crushing force (MCF), energy absorption and crush force efficiency for each case are evaluated. Most of the configurations showed ovalization with low PCF and MCF and moderate crush force efficiency. Afterwards, effects of [Formula: see text] and [Formula: see text] on deformation modes and EA are demonstrated by selecting one of the configurations from each group using published experimental results.
49
Niu, Kang, Qizhi Yang, Shenghe Bai, Liming Zhou, Kaikang Chen, Fengzhu Wang, Shi Xiong, and Bo Zhao. "Simulation Analysis and Experimental Research on Silage Corn Crushing and Throwing Device." Applied Engineering in Agriculture 37, no. 4 (2021): 725–34. http://dx.doi.org/10.13031/aea.14568.
Full textAbstract:
HIGHLIGHTS The mechanism of straw smashing was analyzed. Factors such as the speed of the cutter shaft, the number of blades, the thickness, and the inclination angle had a greater impact on the theoretical length of the straw section after crushing. Based on the straw crushing mechanism, the structure of the crushing chamber was designed. The corn stalk crushing and sending device was trial-produced and field experiments were carried out. ABSTRACT . In order to further improve the crushing quality of corn stalks, this research designs a corn stalk crushing and throwing device. First, it introduced the overall structure and working principle, and analyzed the crushing mechanism of corn stalks to obtain the main factors affecting its crushing performance. Then, the crushing blade in the crushing chamber was designed to determine that the number of crushing blades was 10. Kinematics and dynamic balance analysis, and the establishment of a mathematical model, the speed range of the crushing cutter shaft was 530~900 r/min. On this basis, the ADAMS motion simulation software was used to measure the change curves of the restraint force, runout, and acceleration of the shaft end with different speeds of the crushing cutter shaft. The simulation analysis finally determined that when the speed of the crushing knife shaft was 700 r/min, and the working performance of the device was better and meets the requirements of dynamic balance. Finally, the verification test was carried out, and the result shows: when the speed of the crushing knife shaft was 700 r/min, the qualified rate of corn stalk crushing length was 93.65%. Compared with the original silage corn crushing and throwing device, the performance had increased by 4.78%. It meets the standard of corn stalk crushing operation, which can provide a theoretical basis and scientific basis for the design and optimization of corn stalk crushing and returning equipment. Keywords: Crushing mechanism, Dynamic balance, Motion simulation, Silage corn.
50
Hussein, Rafea Dakhil, Dong Ruan, Guo Xing Lu, and Akshay Kumar. "Cutting Deformation Mechanisms of Square Aluminium/CFRP Tubes." Key Engineering Materials 744 (July 2017): 317–21. http://dx.doi.org/10.4028/www.scientific.net/kem.744.317.
Full textAbstract:
The aim of this study is to find the best platen with blades as a new energy dissipating mechanism that causes considerably damage to CFRP/aluminium tubes. Specially designed and manufactured platens with five different cutting blade profiles were used to simultaneously cut and crush square CFRP tubes and aluminium sheet-wrapped CFRP tubes. The platens with blades were evaluated in terms of the deformation mode, mean crushing force, energy absorption and specific energy absorption of tubes. Experimental results showed that tubes cut and crushed by the platen with 45o inclined blades had the best crushing performance and exhibited a more stable deformation mode compared with those for tubes cut and crushed by other platens with different blade profiles. The platens with blades acted as trigger mechanisms that minimise the initial peak crushing force and maximise the energy absorption of tubes compared with tubes crushed by flat loading platens.