The strain energy release rate of the crack propagation was calculated by using virtual crack closure technique, and fatigue life was forecasted.

采用虚拟裂纹闭合技术计算裂纹扩展的应变能释放率，并对裂纹扩展寿命进行计算。

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The fatigue crack growth rate is the core for predicting fatigue life by use of fatigue crack propagation (FCP) theory.

疲劳裂纹扩展率表达式是采用疲劳裂纹扩展理论预报疲劳寿命的核心。

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Fatigue life prediction from the initial crack size to failure based on long crack propagation at different zones of welded joint was made by using j.

以焊接处微观结构缺陷尺寸作为初始裂纹尺寸，采用基于裂纹闭合的全寿命预测模型，以焊接区域不同位置的长裂纹扩展速率曲线作为基线，利用J。

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