基于有限单元法的基本原理，解决有限元问题中的平面应力和平面应变问题，采用的是三角形单元，可输出节点位移、单元应力、单刚总刚等.-Based on the basic principles of finite element method to solve the problem in the finite element plane stress and plane strain problems, the use of the triangle element, the displacemen