LS-DYNA用户自定义材料模型开发与验证

EXPLOITING AND VERIFYING USER-DEFINED MATERIAL MODEL IN LS-DYNA

当DYNA材料库中不包含所需要的材料模型时,用户可以自定义材料,生成新的DYNA求解器,进行问题的求解。其中需要采用数值算法求解本构方程组时,半隐式的图形返回算法体现了其良好的使用性。通过对一个简单的理想弹塑性模型的求解公式的推导,进一步阐述了这种方法以及编写材料程序的基本过程,并采用单单元模型验证了所编写程序的正确性。

When the required material model does not exist in LS-DYNA material library,users can customise the material and create new calculator of LS-DYNA for solving the problem.Semi-implicit return mapping algorithm represents its good usage when the numerical algorithm is required to calculate constitutive equations in problem solving.In this paper,through the derivation of a solving formula of a simple and ideal elastic-plastic model,we further elaborate this method as well as the basic course of compiling the material program,and a one-element model is used to have verified the correctness of the complied program.