一受均匀拉力的板，中心带贯穿裂纹，裂纹长2a，使用4节点单元计算裂尖应力分布和应力强度因子(A uniform tensile plate with a through crack in the center and a crack length of 2a is used to calculate the stress distribution and stress intensity factor at the crack tip using a four node element)

四杆桁架结构的有限元分析(Bar2D2Node); 三梁平面框架结构的有限元分析(Beam2D2Node); 基于3节点三角形单元的矩形薄板分析(Triangle2D3Node); 基于4节点四边形单元的矩形薄板分析(Quad2D4Node); 基于4节点四面体单元的空间块体分析(Tetrahedron3D4Node); 基于8节点六面体单元的空间块体分析(Hexahedral3D8Node);(Finite element analysis of four bar truss str