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中文摘要：
对采用普通单元和奇异单元的网格计算应力和位移进行分析，对网格的疏密程度以及奇异单元尺寸和围绕裂纹尖端的奇异单元数目对奇异单元法计算精度的影响进行系统分析，得出各种情况下的计算误差随着相关因素的变化规律，并从精度和效率的角度给出了建议。
英文摘要：
The analysis were made on stresses and displacements by standard elements and singularity elements. The calculations were also made to study the influences of the mesh spacing and singulari ty element numbers and sizes around the crack points on calculation precision. Methods were recommended based on the rules of errors varying with relative factors.
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