基于SESAM软件的张力腿平台疲劳强度分析

以张力腿平台为研究对象，建立有限元模型，通过对结构进行总体强度分析，确定疲劳关键区域和关键点。然后建立关键区域的局部模型，对局部模型的网格划分方法进行研究，利用SESAM软件中的Sestra模块计算应力传递函数。最后基于Stofat模块，采用线性外推法得到疲劳关键点处的热点应力，根据S-N曲线，计算出结构的疲劳寿命。结果表明，张力腿平台的疲劳强度满足设计寿命要求。

Fatigue strength analysis of tension leg platform based on SESAM

The finite element model was made taking the tension leg platform as the research object. The key area of the fatigue and the key points' coordinates of the fatigue were determined through overall strength analysis. Then the local model of the key area was made. The approach of dividing grids was researched about the local model. The stress transfer function was calculated through using Sestra module in SESAM. In the end, based on the Stofat module, using the linear extrapolation, the stress of the key fatigue points was obtained. According to the S-N curve, the fatigue life of tension leg platform was calculated. The results show that the fatigue strength of tension leg platform meets the requirements of the design life.