corrosion fatigue crack propagation 腐蚀疲劳裂纹扩展 crack propagation criterion 裂纹扩展判据 crack propagation energy 裂纹扩展能量 .
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The characteristics of corrosion fatigue crack propagation of X60 pipe steel at different loading frequencies and in different corrosion media were studied.
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。
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；
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