利用三角形单元来解决各节点位移u、v和应力σ_x、σ_y和σ_xy。其中材料厚度h 1，材料为各项同性，杨氏模量为E 1，泊松比v 0，-The nodal displacements u, v and stresses σ_x, σ_y and σ_xy are solved by triangular elements. Where the material thickness h 1, the material is homogeneous, the Young s modulus i