离散元与壳体有限元结合的多尺度方法及其应用

在深入研究复杂结构和非均质材料冲击响应和破坏机理的过程中,往往遇到多尺度计算问题。本文尝试建立三维离散元与壳体有限元结合的多尺度方法用于处理圆柱壳问题,该方法采用三维离散元对感兴趣的局域进行局部模拟,利用平板壳体有限元进行整体模拟,采用一种特殊的过渡层使离散元区和有限元区能很好的衔接。我们将这一方法应用于激光辐照下充压柱壳的热/力耦合冲击破坏响应,得到的模拟结果与文献报道有较好的吻合。

A combined discrete/cylindrical shell finite element multiscale method and its application

Analysis of a variety of engineering problems requires computations at different length scales.A combined 3D DEM and cylindrical shell FEM numerical method is proposed to treat the cylindrical problems in this paper.This method performs the discrete element method at meso-scale to reach necessary precision,and the cylindrical shell finite element method at macro-scale.The key point for this method is to define a special transition layer between discrete element zone and the finite element zone.We apply this method to simulate the dynamic failure behavior of a cylindrical shell with inner pressure under laser irradiation and find good agreement between the computational result and the reported result in the references.