The principle of the hydraulic pretension is analyzed, the calculation of bolt elongation and pretightening force is also given.
分析了液压拉伸预紧的工作原理，并给出了螺栓伸长量和预紧力的确定方法。
It is quite complex and difficult to simulate bolt pretension accurately in the analysis of bolt joint by finite element method.
在螺栓联接的有限元分析中准确模拟螺栓的预紧力是一项复杂而困难的工作。
Finally the influence of pretension force to bolt fatigue life is studied and the method that extends the bolt life is proposed.
并研究了螺栓预紧力对螺栓疲劳寿命的影响，提出了延长螺栓寿命的方法。
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