通过修正常应变矩阵，确保单元通过分片检验。
To pass the patch test, the constant strain matrix is modified.
以正交各向异性无限大板孔边应力场解析解为基础，导出了释放应变矩阵计算表达式，并用一个算例验证了该计算式的正确性。
Based on the analytical solution to stress field around a hole in a stressed orthotropic infinite width plate, a set of equations was derived to calculate the relieved strain matrix.
文中针对铝合金预拉伸厚板的特点，提出了测量其内部残余应力的方法，并运用弹性力学理论进行了理论推导，得到了应力-应变关系矩阵。
The modified removal method for measuring residual stress in thick pre-stretched aluminum plates is proposed and the stress-strain relation matrix is deduced by elasticity theory.
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