Modeling of Nonlinear Behaviors of Continua Including Elastoplastic Deformations and Severe Damages Based on Discrete Element Method
This study establishes a framework of the descrete element method (DEM) for modeling nonlinear mechanical behaviors of continua, including elastoplastic deformations and damage processes. New types of connective links between elements are proposed for plan stress, plan strain and asymmetric problems. The inter-element parameters are theoretically determined based on the principle of energy equivallence. Meanwihle, the Mises yield critirion and the flow rule are expressed by basic variables of DEM. Moreover, a numerical scheme, which can apply to model not only the behavior of a continuum but also the transformation from a continuum to a discontinuum, is obtained by introducing a fracture criterion and a contact model to the DEM. The elastoplastic stress wave propagations and a process of a steel plate impcted by a steel ball are simulated. The numerical results agree well with those obtained from the finite element method (FEM) and the corresponding experiment, which validates the accuracy and efficiency of the DEM scheme.
Computation mechanics DEM Plasticity Fracture
Cheng Ming Liu Weifu Liu Kaixin
LTCS and Department of Mechanics & Aerospace Engineering,College of Engineering,Peking University Beijing 100871,P R China
国际会议
北京
英文
317-324
2008-09-24（万方平台首次上网日期，不代表论文的发表时间）