特殊裂纹尖端单节点二次单元包括近裂纹尖端位移近似级数展开第二项。
Special crack-tip SNQE includes the second term of the asymptotic series expansion of the displacement fields near the crack-tip.
在粗网格校正过程中，给出了一种近似求解位移向量误差的方程；
An equation to estimate approximately the error of the displacement vector was given in the correction of the coarse mesh.
利用变换和摄动法将非线性位移方程线性化，得到了近似边值问题。
By using the transformation and the perturbation method, the nonlinear displacement equations are linearized, and the approximate boundary value problems are obtained.
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