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高强钢作为弹体结构设计中最常用的一种材料,针对其在冲击载荷下断裂破坏特性的数值模拟研究一直以来都受到研究人员重视.此类问题通常涉及材料在高温、高压、高应变率环境下的动态响应与破坏.因而本文提出了一种Euler网格与Lagrange标志点相耦合的局部标志点映射算法.该算法在Euler网格中添加带正六面体影响域的标志点,根据标志点与网格的拓扑关系,通过影响域加权将网格物理量映射到标志点上.基于MPI标准编写了三维并行程序代码,在程序中引入Johnson-Cook本构关系与等效应变断裂判据,对钢板在爆炸载荷作用下的破坏行为进行了数值模拟.与实验结果的对比表明,本文提出的算法结合了Euler方法和Lagrange方法的优点,能很好地处理材料的大变形及破坏过程,同时保证了计算精度和效率,可以更好地应用于各类冲击问题的数值模拟研究.
As the most commonly used material in the design of projectile structure, high-strength steel has been paid attention to by researchers for its numerical simulation of fracture and failure under impact load.This kind of problem usually involves the high temperature, high pressure, high strain rate Environment.This paper proposes a local landmark point mapping algorithm based on Euler grid coupled with Lagrange landmarks.This algorithm adds landmarks points with Euclidian domain influence domain according to the landmark points And the topological relation of the grid, the grid physical quantity is mapped to the mark points by influencing the domain weighting.According to the MPI standard, a three-dimensional parallel program code is compiled, Johnson-Cook constitutive relation and equivalent strain fracture criterion are introduced into the program, The results show that the proposed algorithm combines the advantages of Euler method and Lagrange method and can well handle the large deformation and failure process of materials while ensuring The calculation accuracy and efficiency can be better applied to the numerical simulation of various impact problems.