最后算出裂纹疲劳扩展寿命。

Then the crack propagation life of the disk is determined.

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针对新的潜艇用980钢的焊接工艺特点，给出用于潜艇疲劳扩展寿命估算的初始裂纹尺度。

Aimed at the technical characteristic of the 980 steel which was used on the submarine, we can give the length of initialized crack to calculate the fatigue life of submarine structure.

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本文采用断裂力学方法来估算结构构件的疲劳寿命，这其中主要围绕裂纹扩展速率表达式展开研究。

Fracture mechanics is adopted to estimate the fatigue life of structural members, and among the rest, crack growth rate formula is studied.

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