The 3-d finite element model of bolt is calculated by the method of contact analysis, and the fatigue strength of bolt is checked.
并采用接触分析法对螺栓的应力应变进行了三维有限元计算，对螺栓的疲劳强度进行了校核。
A 5-node pseudo element of 3-d elastic contact analysis ws applicable range and concrete practice were also discussed. Its reliability was checked by two examples.
构造了3维5节点接触伪单元以处理固体或壳体接触问题的边界非线性，讨论了其适用的范围和具体应用的情况通过算例，验证了其可靠性。
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