To further estimate the accuracy of this method, a spatial analysis method is adopted, which takes the worn part as cylinder with two spheres or ellipsoids, and applies the 20--node--element.

• 当套管含缺陷部分的长度保持不变时，其抗挤强度随套管长度的增加而增加并趋向一个上限值；当缺陷较长时，空间数值分析结果与平面数值分析结果相近；