侵蚀滑移计算方法的改进  

An improved sideline/eroding algorithm

作　　者：张凤国[1] 韩冰[1] 何长江[1] 

机构地区：[1]北京应用物理与计算数学研究所,北京100094

出　　处：《爆炸与冲击》2011年第3期322-325,共4页Explosion and Shock Waves

基　　金：中国工程物理研究院科学技术基金项目(2007A09002)

摘　　要：将二维拉格朗日有限元程序LTZ-2D中侵蚀滑移的计算方法进行了改进。将单元侵蚀判断标准由单一的累积塑性应变标准改为累积塑性应变、单元的硬化因子以及单元相对于滑移线的变形角度的综合判断标准。同时,利用本文的改进算法对侵彻问题进行了数值模拟。计算结果显示,采用改进后的侵蚀滑移计算方法不仅很好地显示了侵彻过程中弹靶的接触面,而且接触面具有较好的光滑性。A slideline/eroding algorithm,which was implemented into the 2D Lagrangian elasticity-plasticity hydrodynamic code LTZ-2D,was improved.The cell eroding criterion was changed from the accumulative plastic strain to an integrated criterion made of the accumulative plastic strain,the dimensionless stiffness factor and the angle opposite the slideline.And the penetration problems were numerically simulated by the improved algorithm.Calculated results display that the improved algorithm can resolve the interface between the two impacting bodies and smooth out the curvature of the slideline.

关 键 词：爆炸力学 侵蚀滑移算法 侵彻 撞击体 

分 类 号：O36[理学—流体力学]