Journal articles: 'LS-PREPOST'

1

Aini, S. S., Sahari B. Barkawi, Aidy Ali, A. A. Nuraini, A. A. Faieza, Tuan Hafandi Tuan Ismail, M. Shahril, et al. "Introducing Fatigue Contour Plot in LS-Pre Post LSDYNA Finite Element Crash Simulation Software." Applied Mechanics and Materials 165 (April 2012): 275–79. http://dx.doi.org/10.4028/www.scientific.net/amm.165.275.

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In this study, a computer program for calculating fatigue life of component is developed and introduced in LS-PrePost software. The program is written in Fortran programming language and the fatigue life equations used is taken from well-published literature. The materials covered are steel and aluminum. The developed program is able to read stress, strain and element values from d3plot and the keyword file. Having extracted the output from d3plot and keyword file, the fatigue life is then calculated and presented into a separate file called FATIGUE. The integration of output from FATIGUE will is displayed in LS-PrePost. Finally, the results of fatigue life contour are successfully displayed through LS-PrePost.

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Fu, Y. F., J. Gong, D. M. Zhu, Y. J. Liu, Hui Huang, and Mao Fang Huang. "Fatigue Damage of a Cutter Used for Cutting Cashew Nut under Random Load." Applied Mechanics and Materials 743 (March 2015): 49–54. http://dx.doi.org/10.4028/www.scientific.net/amm.743.49.

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To study the fatigue damage of a cutter used for cutting cashew nut, the integrated simulation platform is established with Hypermesh, LS-Dyna, LS-PrePost, and nCode GlyphWorks. The simulation model is established by Hypermesh. LS-Dyna is used to calculate the k file. LS-PrePost is used as the post-processing software. The rain-flow counting, load superposition and extrapolation are executed using Rainflow module in nCode GlyphWorks. The analysis of the fatigue damage of the cutter is executed using Stress Life module in nCode GlyphWorks. The equivalent stress time history of different elements in the upper and lower cutters, rain-flow counting histogram after load spectrum superposition, rain-flow counting histograms after load spectrum extrapolation, and damage histogram of the cutter are obtained. The results show that the cutter has excellent mechanical properties, and the minimum fatigue life of the cutter is about 495 days, which is a conservative solution.

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Shi, Yun Bo, Peng Lan Chai, Xing Juan Zhao, Ming Si Qi, and Jun Liu. "Simulation Research of High-Speed Projectile Penetrating Steel." Advanced Materials Research 211-212 (February 2011): 347–51. http://dx.doi.org/10.4028/www.scientific.net/amr.211-212.347.

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The prototype testing of penetration requires a large amount of manpower, material and financial resources. So computer simulation technoolgy is used to save the resource.The process of high-speed penetration is simulated based on nonlinear dynamic analysis software ANSYS/LS-DYNA, and especially the simulation process of ANSYS/LS-DYNA is stated. Firstly, the theoretical analysis of material model and state equation are completed in the process of simulation. And by using the post-processor LS-PREPOST of LS-DYNA, the effective stress curve and acceleration changing curve were obtained. Simulation results show that: JOHNSON_COOK material model is correct in solving the problem of high-speed penetration, and the stress of internal projectile is decreasing along the axial direction.

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Wang, X. G., Wei Guo, and Jian Qin Liu. "Explicit Dynamics Simulation Research on Soil Cutting of Shield Machine Based on LS-DYNA." Materials Science Forum 697-698 (September 2011): 642–45. http://dx.doi.org/10.4028/www.scientific.net/msf.697-698.642.

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In this paper, the universal nonlinear finite element software LS-DYNA is applied to the explicit dynamics simulation of shield’s soil cutting in tunneling, and using Non-reflective boundary of DYNA’s module, accurately conduct the dynamic analysis of shield’s tunneling. Finally Making visualization processing on the computed results with the post-processing soft LS-PREPOST. Compared with results of static’s simulation and small-sized shield experiment indoor, the explicit dynamics simulation used in the paper is in good agreement with them. Through the alleosis chat of internal energy, we can see that LS-DYNA can be commendably utilized to explicit dynamics simulation of soil cutting of shield’s cutter, simultaneously, we also concluded that moderately increasing the cutter opening rate will have a significant impact on improving the unearthed rate of soil residue, tunneling efficiency and lowering the total thrust force of the shield.

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Sun, Zhi Li, Peng Fei Chen, Feng He Zhang, and Ya Dan Huang. "Reliability Sensitivity Analysis of Sliding Bearing Based on Virtual Simulation Technology." Applied Mechanics and Materials 16-19 (October 2009): 334–39. http://dx.doi.org/10.4028/www.scientific.net/amm.16-19.334.

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As a non-linear finite element analysis software ANSYS/LS-DYNA is used to carry out virtual reliability test in transmission mechanism of reciprocating compressor and response surface method is used to analyze reliability and sensitivity of sliding bearing according to testing data. This paper uses ANSYS to preprocess testing models of virtual prototype and put out the K file; designs sample points of random variables based on central composite method and modifies the K files to carry out random sampling of prototype and uses LS-DYNA970 to solve the submitted K files repeatedly; plots relationship curves of output responses and time history and gets a group of sample points of structure response with post-processing results of LS-PREPOST. Lastly this paper uses response surface method to build limit state equation and analyze reliability and sensitivity of sliding bearing, and provides theoretical basis for design of bearing.

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Wang, Yong Hu, Cai Hua Chen, Ting Yu Zhao, and Wei Hu. "Numerical Simulation Technique of Disks Skipping Based on the SPH Method." Applied Mechanics and Materials 668-669 (October 2014): 494–98. http://dx.doi.org/10.4028/www.scientific.net/amm.668-669.494.

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It is significant for the phenomena of bouncing on water to analyze the ditching procedure of any kind of aircraft. The SPH method is employed to achieve a numerical simulation in the architecture of LS-DYNA and PrePost programs. The water domain is modeled by SPH and the boundary condition is discussed too. Through a set of contrastive analysis of different boundary conditions, some constructive suggestions of establishing the boundary conditions are given to deeply simulate aircraft ditching in the future.

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Liu, Xue Qiang, Jian Chun Zhang, Hao Zhang, and Xin Hu. "Dynamic Load Simulation Analysis of Hemp Stalk." Applied Mechanics and Materials 303-306 (February 2013): 2724–26. http://dx.doi.org/10.4028/www.scientific.net/amm.303-306.2724.

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The distribution of maximum equivalent stress on hemp stalks at different roller speeds were scavenged by LS-PREPOST function. The stress and strain distributions of hemp stalk under the transversely even-distributed load are analyzed through ANSYS software. The results show that hemp decortication largely depended on the rotation speed of separation roller and the feeding rate. In addition, the failure degree of bast fiber, the maturity and the water content of the stalk, and the difference in mechanical properties and geometrical size should be also taken into account.

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Afzeri, M. S. Shahdan, and H. Shah Qasim. "Effect of Addendum Parameters to the Formability of Aluminum AL 6303." Advanced Materials Research 264-265 (June 2011): 206–11. http://dx.doi.org/10.4028/www.scientific.net/amr.264-265.206.

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Procedure of die design is mostly based on iterative try and error to obtain final design with good stamping formability. The stamping formability of sheet metal part is possible to be improved by adding addendum features at die model. In this paper discusses the effect of drawbars toward the formability of stamping process of aluminum AL6063. Effect of addendum size is evaluated Finite Element Simulation to prevent wrinkling and tearing. Simulation model is constructed by designing a simple die, punch and binder using variety drawbar diameters. The model further evaluated using LS-Dyna software interfaced by forming tool of LS-Prepost. Formability of the model is evaluated through yield stress, major strain and minor strain data. From the result of evaluation obtained that without draw beat, major/minor strain is above FLD while the formability is improved by applying 5 mm draw bead diameter.

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9

Ayten, Ali İmran, Bülent Ekici, and Arif Nihat Güllüoǧlu. "Effect of surface geometry on low-velocity impact behavior of laminated aramid-reinforced polyester composite." Journal of Composite Materials 50, no. 29 (July 28, 2016): 4077–91. http://dx.doi.org/10.1177/0021998316632600.

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The aim of this study is to investigate the effect of surface geometry for low-velocity impact applications. To achieve this purpose, aramid fiber-reinforced laminated polyester composite with various geometries such as cylindrical, elliptical, and spherical were prepared, and low-velocity impact properties were investigated numerically and experimentally. All properties such as orientation, fiber volume fraction, matrix material, and average thickness are the same in all samples. Experimental low-velocity impact behaviors of structure were determined by drop weight tester at low velocity 2.012 m/s. Simulations were carried out by LS-Prepost 4.2 and LS-Dyna v971 software. By this way, results of impact tests were verified and modeled with finite element method. Results of the impact tests showed that the elliptical samples have the highest energy absorption capability due to effective stress transfer capacity. According to experimental results, maximum energy absorption rate difference is 17% between elliptical 10 mm and cylindrical 5 mm geometries.

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Yang, Seung H., Kwang S. Woo, Jeong J. Kim, and Jae S. Ahn. "Finite Element Analysis of RC Beams by the Discrete Model and CBIS Model Using LS-DYNA." Advances in Civil Engineering 2021 (February 22, 2021): 1–9. http://dx.doi.org/10.1155/2021/8857491.

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There are several techniques to simulate rebar reinforced concrete, such as smeared model, discrete model, embedded model, CLIS (constrained Lagrange in solid) model, and CBIS (constrained beam in solid) model. In this study, however, the interaction between the concrete elements and the reinforcement beam elements is only simulated by the discrete model and CBIS (constrained beam in solid) model. The efficiency and accuracy comparisons are investigated with reference to the analysis results by both models provided by LS-DYNA explicit finite element software. The geometric models are created using LS-PrePost, general purpose preprocessing software for meshing. The meshed models are imported to LS-DYNA where the input files are then analyzed. Winfrith and CSCM concrete material options are employed to describe the concrete damage behavior. The reinforcement material model is capable of isotropic and kinematic hardening plasticity. The load versus midspan deflection curves of the finite element models correlate with those of the experiment. Under the conditions of the same level of accuracy, the CBIS model is evaluated to have the following advantages over the discrete model. First, it has the advantage of reducing the time required for FE modeling; second, saving computer CPU time due to a reduction in total number of nodes; and third, securing a good aspect ratio of concrete elements.

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Pawlak, Mariusz, Sebastian Sławski, and Sławomir Duda. "Numerical model of tracked vehicle crossing inland water." MATEC Web of Conferences 285 (2019): 00014. http://dx.doi.org/10.1051/matecconf/201928500014.

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In this paper, a numerical model of tracked vehicle with a simplified suspension and a winch forcing movement at a constant speed of 2 m / s is presented. The simplified vehicle body was created in the CAD environment, the suspension model, dry and wet obstacle, as well as the winch system and material models, were created in the LS PREPOST. The body of the vehicle was treated as a rigid, mounted by springs and dampers on tracks, the solid element was replaced by a shell element with assigned moments of inertia and mass in the node located in the centre of gravity of the vehicle. The characteristics of the resultant contact force of vehicle travel on the rigid ground for a dry and water obstacle are presented.

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Zhi, Chao, Hairu Long, and Fengxin Sun. "Low-velocity impact properties and finite element analysis of syntactic foam reinforced by warp-knitted spacer fabric." Textile Research Journal 87, no. 16 (September 13, 2016): 1938–52. http://dx.doi.org/10.1177/0040517516660890.

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The aim of this research was to investigate the low-velocity impact properties of syntactic foam reinforced by warp-knitted spacer fabric (SF-WKSF). In order to discuss the effect of warp-knitted spacer fabric (WKSF) and hollow glass microballoon parameters on the impact performance of composites, eight different kinds of SF-WKSF samples were fabricated, including different WKSF surface layer structures, different spacer yarn diameters and inclination-angles, different microballoon types and contents. The low-velocity impact tests were carried out on an INSTRON 9250 HV drop-weight impact tester and the impact resistances of SF-WKSF were analyzed; it is indicated that most SF-WKSF specimens show higher peak impact force and major damage energy compared to neat syntactic foam. The results also demonstrate that the surface layer structure, inclination-angle of the spacer yarn and the volume fraction and type of microballoon have a significant influence on the low-impact performance of SF-WKSF. In addition, a finite element analysis finished with ANSYS/LS-DYNA and LS-PrePost was used to simulate the impact behaviors of SF-WKSF. The results of the finite element analysis are in agreement with the experimental results.

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Meng, Wen Yuan, Guan Chao Xu, Jia Qing Li, Guan Chun Xu, Jun Wei Guo, and Wei Zhao. "Numerical Simulation and Experimental Research of Icicles under the Single Point of Blasting in the Yellow River." Applied Mechanics and Materials 501-504 (January 2014): 2020–25. http://dx.doi.org/10.4028/www.scientific.net/amm.501-504.2020.

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Blasting model of ice is established by ANSYS-LSDYNA in this paper. By using LS-PREPOST, the author analyzes the broken volume or diameter of ice in different working conditions, including the buried depth of explosive, the load and the thickness of ice. ORIGN drawing software is used to analyze the most suitable blasting location with different thickness of ice. The result shows that when the thickness is between 20cm and 60cm, the best blasting coefficient of water-medium ice is K=R/ H =0.5~1. It also shows that the explosive effect will be better when it is exploded under ice layer than in the middle or at the surface of ice layer. Calculation result and field test align fairly well. By simulating blasting parameter in different working conditions, ice prevention database is built, providing references for designers to develop a series of shaped into ice equipments. It also has important practical meaning to use various equipments to prevent and treat ice disasters of the Yellow River.

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14

Ивченко, Дмитрий Владимирович, Вячеслав Михайлович Меркулов, and Наталья Владимировна Сметанкина. "РАЗРАБОТКА МОДЕЛИ ПТИЦЫ-УДАРНИКА ДЛЯ МАТЕМАТИЧЕСКОГО МОДЕЛИРОВАНИЯ ПРОЦЕССОВ ПОВРЕЖДЕНИЯ ДЕТАЛЕЙ ТУРБОРЕАКТИВНОГО ДВУХКОНТУРНОГО ДВИГАТЕЛЯ." Aerospace technic and technology, no. 8 (August 31, 2020): 82–90. http://dx.doi.org/10.32620/aktt.2020.8.11.

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This study aims to develop of the bird-impactor model for mathematical modeling of turbofan engine parts damage processes in case of a bird ingestion into the its air-gas channel. The bird-impactor model was justified for simulation of bird with mass of 0,70…3,65 kg for certification requirements on aircraft engines according to aviation regulations CS-E, FAR-33, AP-33. It was implemented in numerical SPH model for explicit LS-DYNA Solver of ANSYS LS-DYNA software package. The pre - and postprocessor LS-PrePost program also was used for numerical SPH model generating, preparing input data and processing the results from calculations. The bird-impactor model was had a hemispherical-ended cylinder geometry form. Material of the bird-impactor model was defined as a mixture of water (90-percent of volume) and air (10-percent of volume). The Null material model with low strength and the linear polynomial equation of state were used for the bird modeling. It was considered impacts bird to the rigid plate at striking velocities of 100...300 m/s and impact angle of 45°, 90° for the bird- impactor model verification. The rigid plate was modeled as a fixed thick steel plate. Volume of rigid plate was meshed with finite elements. The transducer was installed in center of the rigid plate. It was modeled by one finite element. The pressure of impact bird was obtained by dividing the contact force for finite element - transducer to its area. Thus the pressure curves were calculated for each impact bird to rigid plate. The Hugoniot pressure (shock pressure) was defined as maximum of pressure curve. The stagnation pressure was defined for phase of curve with approximately constant low pressure level by Simpson's rule. Verification of the developed bird-impactor model was performed by comparing the calculating results of Hugoniot and stagnation pressures used the developed bird-impactor, the one-dimensional hydrodynamic theory and calculation results of other authors. Verification of developed the bird-impactor model was shown good agreement with the one-dimensional hydrodynamic theory and with results of other authors.

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Abdul Aziz, Nuraini, Norzima Zulkifli, and Amar Ridzuan A. Hamid. "CRASH ANALYSIS OF RACING CAR NOSE CONE SUBJECTED TO FULL FRONTAL IMPACT." Jurnal Teknologi 75, no. 8 (August 20, 2015). http://dx.doi.org/10.11113/jt.v75.5209.

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Racing a car involves high-speed and having high possibility to crash either among the racer or hitting the bench. Concerning the driver safety, impact structures such as nose cone is designed to absorb the race car kinetic energy to limit the decelerations acting on the human body. In this study, analysis of different type of nose cone material were conducted. The objective is to find the highest specific energy absorption (SEA) based on three different materials which are mild steel, aluminium and composite material. The nose cone was modelled using CATIA V5R16 while the crash simulation was done using LS-DYNA and LS-Prepost software with an average velocity of 80km/hour according to United States New Car Assessment Program (US-NCAP) frontal impact velocity and based on European Enhanced Vehicle-safety Committee. The simulation results show that fiberglass E with thickness of 2.6 mm and lay-up configurations of [0°/30°/60°/90°/120°] give the highest internal energy and specific energy absorption of 41.28845 kJ and 6.9104 kJ/kg. This concludes that fiberglass E is a suitable material to build a lightweight structure compared to steel and aluminium.

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Kasaei, Ali, Nuraini Abdul Aziz, Aidin Delgoshaei, Suraya Mohd Tahir, and Alireza Rezanoori. "Optimum gas tank locating in van vehicle – front and side crash analysis consideration for passenger safety." Engineering Solid Mechanics, 2021, 177–220. http://dx.doi.org/10.5267/j.esm.2020.12.002.

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In this research, crash test results from CNG locating method optimization approach for crashworthiness and testing its safety are presented. The locating process is based on principal energy considerations inspired from the current design process in passenger vehicle design development. The potential of the vehicle concept to absorb kinetic energy can be estimated at the very beginning of the design process by the free crash lengths in the different areas of the vehicle and estimates of average forces required in the specific segment and parts of the car body at particular crash phases. Based on the basic principle of vehicle crash analysis using the finite element method, a passenger VAN finite element model was selected to simulate the front and side rear collision test of the VAN, therefore the LS-DYNA software is adopted to calculate the deformation of the car and the acceleration time history curves during the crashing process; the anti-impact capability of the vehicle is evaluated from this simulation. It is important to determine appropriate force distributions and the corresponding loads paths through the whole structure for all relevant crash load in dedicated crash test cases. The results demonstrate that the improvement of local structure and location for the required CNG tanks in safe locations in vehicle chassis can promote the crashworthiness of the car, but the further improvement needs a major change of the vehicle structure. The outcomes are interpreted by using LS-PREPOST to analyze the energy absorption characteristics during crash for different cases at a velocity of 50km/h the duration of 12ms. The result analysis was necessary to derive distinct deformation phases characteristic and following that, the essential crash elements are compared with and without CNG tanks installation in each crash case. At last, the conclusion determines the proposed tank locating model in the selected passenger VAN is within the safe range of crash analysis standards.

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Zhen, Xu, Yongguo Zhang, Kehui Ma, Dechao Yan, Yuan Meng, and Xu Liang. "The Influence of Occupant Grip on Ceiling Handrail and Injury Assessment in Collision." International Journal Of Scientific Advances 2, no. 4 (2021). http://dx.doi.org/10.51542/ijscia.v2i4.11.

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With the rapid increase in the number of cars, to bring a variety of convenience to mankind, at the same time, a number of traffic safety problems also followed, which causing serious injuries and property losses, bring more pain and regret to the people. Therefore, to accurately assess the damage of the personnel in the collision safety accident is very useful to improve the safety performance and functionality of the vehicle. so, the crash dummy plays an important role in the research of crash safety. At present, in the study of human body injury in the collision with dummy, the influence of roof handrails grasping state was not considered. Therefore, the software of LS-PREPOST and Oasys PRIM-ER are used to build model of automobile cockpit and dummy with hand grip ability, the acceleration environment of frontal crash was simulated by adding B-pillar acceleration curve from real vehicle crash test. Comparing injuries of dummies in free sitting posture and holding the roof armrest in collision. he simulation results show that when the dummy was grasping the roof armrest, the peak value of head acceleration and HIC values were 6.1% and 30.2% lower than the dummy was sitting freely, the maximum value of shear force, tensile force and bending moment of the neck were reduced by 87.4%, 76.9% and 42.9% respectively, and the maximum value of chest compression was reduced by 16.9%. The results provide a reference for the research of passive safety in collision.

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Journal articles on the topic 'LS-PREPOST'

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