【Key words】 mini-plastic zone displacement; rock-bridge; compressive-shear crack; extend; singular finite element
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Based on the isoparametric singular element theory a quarter singular element is developed, the finite elements program for fracture analysis of structures is put forward using Fortran 90.
2．利用1／4边节点法，推导了结构断裂分析的等参数奇异单元，并编制了F90程序。
参考来源 - 结构断裂分析的广义参数有限元法·2,447,543篇论文数据，部分数据来源于NoteExpress
而且奇异单元刚度矩阵中的各元素可以用较简单的分析式表出。
Furthermore, each element in the singular stiffness matrix can be expressed by some more simple analytic formulas.
模型中考虑了橡胶材料的非线性和不可压缩性，以及断裂奇异单元的收敛性。
The nonlinear property and incompressibility of rubber materials and the convergence of crack singular elements are considered in this model.
在建立有限元模型时对于裂纹尖端的单元，采用节点—单元的方式生成二次奇异单元。
When FEA model was formed, the quadratic singular elements of the tip of the crack were formed by node to element.
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