... No compression or tension elasticity（无压缩或位伸弹性材料，即单力性材料） Plane stress orthotropic failure（平面应力单元） Porous elasticity（多孔弹性） ...
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利用这一方法得到一个新的八节点四边形平面应力单元。
By the present method, a new incompatible curved quadrilateral plane element with eight nodes is obtained.
该方法不用一般的变分原理，可适用任意变系数正定和非正定偏微分方程。利用这一方法得到一个新的八节点四边形平面应力单元。
It doesn't need the variational principle and can be applied to solve non-positive or positive definite partial differential equations with arbitrary variable coefficient.
首先，对反射裂缝尖端应力场的奇异性进行了描述，建立了平面断裂问题应力强度因子的有限单元解。
Firstly, after depicting the singularity of stress field at the top of crack, the finite element method to calculate stress intensity factor of plain fracture problems is founded.
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