Moreover, the study indicated that the fatigue crack initiation period is the main portion of the total fatigue life at long lives.

该研究还表明，在长寿命范围，裂纹起始寿命是疲劳全寿命的主要部分。

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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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