基于材料的循环塑性预测了疲劳裂纹扩展的门槛值。

Fatigue crack growth threshold is predicted based on materials cyclic plasticity.

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根据试验测定的焊缝各区冲击韧性、断裂韧性、疲劳裂纹扩展速率和疲劳裂纹扩展门槛值，对焊缝力学性能作出综合评价。

The mechanical properties of the butt welded joints have been evaluated according to the impulsive and fracture toughness as well as the rate and threshold values of fatigue crack propagation.

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采用对比分析方法，从疲劳裂纹的门槛值角度出发，归纳总结了疲劳裂纹的扩展规律。

In contrast with the threshold of fatigue cracks, a series of regulation of expanding of fatigue small cracks has been deduced.

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