非线性侵彻动力过程的再生核质点法

An improved reproducing kernel particle method for nonlinear dynamical penetration process

通过在再生核质点法中引入Johnson-Cook本构方程及损伤模型,并利用新型的滑移面算法及配点法解决再生核质点法中的接触面和质点滑移问题,方便实现边界条件和计算过程中质点速度调整。通过侵彻过程再生核质点法研究,实现了弹丸侵彻靶板过程的模拟分析,避免了有限元法中单元严重变形和破坏过程的网格重构困难,提高了分析精度和计算速度,可方便模拟侵彻的大变形和高应变率现象。

The Johnson-Cook constitutive relations and damage model were introduced into the reproducing kernel particle （RKP） method, and a new interface calculation method and a collocation method were proposed to solve the problems of interface and gliding particles, realize the boundary conditions and adjust the particle velocity in the computational process. The improved RKP method was applied to numerically analyze the oblique penetration process of a steel cylindrical pellet into a fixed steel plate. In the computation, the pellet and target plate were divided into kernel particles other than elements. Computational results show that the improved RKP method can avoid the finite element deformation in the finite element method and the element reconstruction in the damage process and enhance analysis accuracy and computational speed. And the improved RKP method can be used to conveniently analyze the large deformation and high strain rate phenomena in penetration process.