Taking the distribution of mean wind velocity into account, the random crack growth model under variable amplitude load was established.

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。

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Study of fatigue crack growth rate and fatigue life calculation under random loading is very important for the reliable life prediction of engineering structures.

变化载荷作用下裂纹扩展律和疲劳寿命的计算对工程结构的寿命的可靠预测是十分重要的。

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Many engineering structures are subjected to random loading in service. The load cycle interactions can have a very significant effect in fatigue crack growth under variable amplitude loading.

许多工程结构在服役过程中受到随机载荷的作用，载荷循环之间的相互作用对裂纹扩展将产生明显的影响。

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