考虑一个平面应力问题，如图所示，假设厚度h 1，材料为各项同性，杨氏模量为E 1，泊松比v 0，相关力和位移边界条件如图中所示，问题左端为固定约束。试用两个三角形单元分析此问题。试求问题各节点位移u、v和应力σ_x、σ_y和σ_xy。-Consider a plane stress problem, as shown, assuming thickness h　 1, the material is homogeneous, Young s modulus E　 1, Poisson s ratio v　 0, the correlation force and displacement boundary conditions shown in the figure , The left side of the problem is a fixed constraint. Try using two triangular cells to analyze this problem. The displacements u, v and stress σ_x, σ_y and σ_xy of each node are calculated.