结果表明，该近似表达式适用于A型腐蚀疲劳裂纹扩展速率的计算。
The given calculating example shows that the expression has a better applicability for the crack propagation rate of type A.
研究了不同腐蚀介质中及加载频率下x 6 0管线钢的腐蚀疲劳裂纹扩展特性。
The characteristics of corrosion fatigue crack propagation of X60 pipe steel at different loading frequencies and in different corrosion media were studied.
腐蚀环境对材料的裂纹扩展有较明显的加速作用，酸碱处理后材料的磨损机制主要是磨粒磨损和疲劳磨损的综合作用。
The corrosive environment accelerates strongly crack growth of the composites. After acid and alkali treatment, the wear mechanism is the synthetic action of abrasive wear and fatigue fracture.
在此基础上，建立了腐蚀环境下疲劳裂纹扩展速率试验中裂纹长度的自动检测技术。
On the basis of this, an automatic measurement technique of fatigue crack length in fatigue crack growth rate test under corrosive circumstance is established.
本文对921A钢焊接接头在海水腐蚀环境下受弯曲疲劳载菏作用时表面裂纹扩展规律进行了试验研究。
The propagation of surface cracks in welded connections made of type "921A" steel has been investigated experimentally under bending fatigue load and in the corrosive environment of seawater.
③井下发生燃爆，会改变下部钻具表面的金相组织，加速了腐蚀和疲劳裂纹萌生、扩展；
Burning underground will change the surface of microstructure of BHA, and accelerate corrosion and fatigue crack initiation and propagation;
③井下发生燃爆，会改变下部钻具表面的金相组织，加速了腐蚀和疲劳裂纹萌生、扩展；
Burning underground will change the surface of microstructure of BHA, and accelerate corrosion and fatigue crack initiation and propagation;
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