用平面四边形等参单元和罚函数法求解含接触的大变形问题-Plane quadrilateral isoparametric elements and the penalty function method for solving large deformation problems with contact

一个用于大变形下的弹塑性材料模型。希望我的注释能帮助初学者理解-One for large deformation elastic-plastic material model under. I hope my comments can help beginners understand

自然单元法是一种计算介于固体和液体之间大变形形式的力学方法，此程序完整，好用。-Natural element method is a method of calculating large deformation between mechanics between solid and liquid form, this program complete, easy to use.