在建立裂纹扩展模型的时候，要考虑到裂纹长度对裂纹闭合效应的影响。
The simulating results have indicated that: the crack closure effect is obviously influenced by the fatigue crack length.
考虑平均风速的分布的影响，建立了随机荷载作用下的疲劳裂纹扩展模型。
Taking the distribution of mean wind velocity into account, the random crack growth model under variable amplitude load was established.
疲劳寿命的计算采用断裂力学方法，建立疲劳裂纹扩展模型和失效模式的极限状态方程。
Fatigue damage estimation of the tendons was made using fracture mechanics approach, establishing the fracture crack growth rate model and limit state equations for failure modes.
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