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摘要: 提出了一种基于节点分离概念的Lagrange有限元冲击破碎分析的算法,采用节点分离技术实现 了网格断裂,并用畸变侵蚀技术处理严重畸变单元。利用C++编程实现了节点分离计算模型的创建和畸变 侵蚀,结合LS-dyna的重启动分析功能,编程调用LS-dyna求解器以及畸变侵蚀程序实现了破碎分析。分别 用节点分离的Lagrange有限元算法、SPH 无网格算法对超高速碰撞问题进行了数值模拟,并与文献中的实 验结果和Euler有限元数值模拟结果进行了对比。结果表明,节点分离算法具有计算速度快、数值稳定、边界 明确等优点,能准确有效模拟超高速碰撞问题。Abstract: AnimprovedLagrangefiniteelementmethodwasproposedforimpactfractureanaylysis,in whichthenodeseparationtechniquewasusedtoachievemeshseparationandthedistortionerosion methodwasappliedtodealwithseriouslydistortedelements.ByapplyingtheLS-dynasolver,a C++programwasdevelopedtoestablishthecomputationalmodelforthenodeseparationandimplementthedistortionerosion. TheC+ + program wascombinedwiththeLS-dynarestartanalysis functiontoachievefractureanalysis.Ahypervelocityimpactproblemwassimulatedbythenode-separationLagrangeFEMandSPH meshfreemethod,respectively.AndthesimulatedresultswerecomparedwiththeexistingexperimentalresultsandtheEulerEFMresults. Comparisonshowsthatthe node-separationLagrangeFEM takestheadvantagesoffastcalculation,goodstability,andclear boundary,anditcanbeusedtoaccuratelyandeffectivelysimulatehypervelocityimpactproblems.
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Key words:
- mechanicsofexplosion /
- debriscloud /
- FEM /
- hypervelocityimpact
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