Range of the Applicability of the Wilkins Method to the Investigation of the Dynamic Stress-Strain State of Anisotropic Elastic Axisymmetric Shells

The exactness and stability of the Wilkins method in the investigation of the stress-strain state of axisymmetric anisotropic elastic shells, including thick-walled ones, have been studied for different values of artificial viscosity, pulse load rise and fall time, and different deformation process durations. A comparison of numerical calculations, performed by means of an application software package developed by V. A. Romashchenko on the basis of the Wilkins method, with experimental results, known numerical data, and with calculations using the computation kernel LS-DYNA 3D has been carried out.     

Efficient modeling of panel-like structures in perforation simulations

This paper presents results of numerical simulations for impact effects in panel-like structures using solid and shell element modeling techniques. Three examples from experiments in literature have been numerically analyzed. The nonlinear transient dynamic analysis code, LS-DYNA is used in the simulations to model projectiles and panel-like targets. It is found that models established for panel-like targets using solid shell elements cannot only save significant computational effort, but also produce good results as long as the panel-like targets satisfy certain conditions. A criterion that governs the validity of modeling panel-like targets with shell elements is proposed in the paper.     

Numerical Simulation of Deforming Manufacture Process for Automobile Bevel Gear Blank

1 Introduction Rear axle bevel gearis a vital kind of annular accessory with high precision and hugeload availablefeatures ,andit is widely used as the differential drive in automobiles and tractor .In China ,the traditional manufactureapproach of producing the rear axle bevel gear blankis die forging,which not only requires a highinvestment ofproduct equipments , but also involves a low material utilization and great noise .In order to overcome thesedrawbacks , manyresearchers have done a gre…     

线性聚能装药切割钢靶的数值模拟

基于非线性3D模拟软件ANSYS／LS—DYNA和LS—REPOST，用ALE算法模拟线性聚能装药射流形成以及射流对某均质钢靶切割侵彻的过程。在模拟过程中考虑到射流、空气和钢靶的流固耦合问题，故计算模型基本合理。经过计算，得到了线性聚能装药爆轰波的传播过程、射流形成过程以及钢靶切割过程的3D模拟结果，用LS—REPOST软件也得到了射流头部压力、速度和加速度变化曲线。将数值模拟和计算结果进行对比，结果令人满意、可信，3D数值模拟较以前的2D模拟更形象逼真，显示了ALE算法解决此类问题的优越性。     

预控破片形成过程的数值模拟与分析

为了获得预控破片战斗部破片的飞散规律,利用ANSYS／LS-DYNA有限元软件对某榴弹壳体膨胀和破片破碎过程进行数值模拟,得到破片初速和飞散方向角沿弹轴曲线分布,与破碎性试验回收破片的统计结果和经验公式都基本一致,这说明模型简化及计算参数的正确性．     

用LS-DYNA模拟柱状弹丸侵彻薄钢板过程

根据破片模拟弹侵彻钢板的理论研究,采用ANSYSLS—DYNA对破片模拟弹侵彻钢装甲的侵彻过程、钢板的破坏模式以及弹体的侵彻速度进行有限元分析,并将分析结果与理论结果进行比较．分析结果表明,有限元分析的破片模拟弹侵彻特性及刚装甲破坏模式与理论结果有较好的一致性,讨论了弹丸侵彻装甲的作用过程,有限元分析结果表明,采用适当的模型,有限元法能较好地模拟破片模拟弹侵彻钢板的侵彻过程、侵彻特性以及钢板的破坏模式．     

碎石垫层地基对提高建筑物抗震能力的ANSYS/LS-DYNA显式积分程序模拟分析

为了验证设置碎石垫层的地基对上部建筑物的减振性能,用ANSYS10.0软件里的ANSYS/LS-DYNA显式积分程序对两种平面框架——地基设置碎石垫层的平面框架和地基未设置碎石垫层的平面框架进行地震响应模拟分析.在程序模拟中,将碎石垫层的厚度取为1 000 mm.由于整个碎石层相对厚度很小则其每一薄层动剪切模量取等值.模拟试验结果表明,在水平地震波的作用下,地基设置碎石垫层的平面框架的最大正位移较地基未设置碎石垫层的平面框架减少了56.08%,最大负位移减少了56.72%.因此,设置碎石垫层的地基在一定程度上有助于提高上部建筑物的抗震能力.     

海浪对导弹出水姿态影响数值分析

基于LS-DYNA有限元软件建立了导弹出水过程的有限元模型,应用数值仿真方法分析了海浪对导弹出水姿态的影响,获取了导弹在不同海浪等级条件下出水姿态的变化规律,为获取极限海浪等级对导弹出水姿态影响的运动规律,提供了有效的数值仿真手段。     

热连轧圆钢成品孔型的有限元分析

根据ф16 mm圆钢的轧制规程,运用有限元分析软件ANSYS中的LS-DYNA大变形弹塑性显式分析动力学模块,对终轧机架在分别采用双半径圆弧和切线扩张角两种成品孔型条件下的热连轧过程进行有限元模拟。对比分析了同一轧件在不同孔型中的金属流动特性和应力应变分布规律。结果表明,有限元模拟结果与实际生产过程相吻合;对同样采用30°扩张角的两种孔型而言,轧件在双半径圆弧成品孔型中的表面受力和总体应变分布更为均匀;轧件在成品孔型的圆弧扩张部位受到的应力较大,使轧辊轧槽表面磨损不均;采用材质硬度更高的成品轧辊,可以降低轧槽表面的磨损程度,延长轧辊孔型的使用寿命,节约生产成本。     

汽车行李箱盖关闭冲击及耐久性分析

基于LS-DYNA提出一种对汽车行李箱盖进行关闭冲击仿真的建模方法.建立密封条和锁总成的详细模型,并根据仿真结果对行李箱盖进行耐久性预测.仿真结果与试验结果的对比验证该模型的准确性.该方法可有效仿真汽车行李箱盖的关闭冲击及耐久性能,提升设计效率.