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。
The flow state within the corrosion fatigue crack and the influence of other parameters on the flow velocity for compact tension specimen were discussed according to the model.
据此，以紧凑拉伸试样为例，讨论了影响速度的各参数及裂纹内的流态。
Corrosion pitting also can lead to fatigue crack initiation depending on the component, the location of pitting, and cyclic loading conditions.
腐蚀斑点还会因不同的部件、斑点的位置和循环载荷状况，导致一些不同的疲劳裂纹。
The theoretical analysis indicated that the crack closure effect was mainly responsible for the change of crack growth retardation in corrosion fatigue.
分析表明，塑性诱发裂纹闭合在腐蚀条件下的变化是造成超载后裂纹扩展规律变化的主要原因之一。
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；
After electroplating, can improve the corrosion resistance of the surface of the product, and can delay the expansion of fatigue crack, effectively prolong the service life of the product.
经过电镀后，可以提高产品表面的抗腐蚀能力，并能延缓疲劳裂纹的产生扩大，有效延长产品使用寿命。
After electroplating, can improve the corrosion resistance of the surface of the product, and can delay the expansion of fatigue crack, effectively prolong the service life of the product.
经过电镀后，可以提高产品表面的抗腐蚀能力，并能延缓疲劳裂纹的产生扩大，有效延长产品使用寿命。
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