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Corrosion fatigue crack growth modelling for subsea pipeline steels

机译：海底管线钢腐蚀疲劳裂纹扩展模型

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摘要

Based on the recent development of research for environment-assisted cracking (EAC), a crack growth model for the corrosion fatigue (CF) of subsea pipeline steels is proposed in this paper. The model adopts a two component structure in consistence with the physical fact that CF is a mixed process of stress corrosion (SC) and hydrogen-assisted cracking (HAC). Anodic dissolution (AD) and hydrogen embrittlement (HE) are believed to be responsible for SC and HAC and their models are integrated in the general model within a framework of fracture mechanics. The model is then applied to modelling the CF crack growth of X65 pipeline steel and the results show that the shape of the modelled crack propagation curve can be controlled well using the proposed model, and both the exacerbated cracking rate and behavior features can be captured with appropriate consideration of the effects of mechanical and environmental parameters, such as loading frequency, stress ratio, temperature, and hydrogen concentration, etc.
机译：基于环境辅助开裂（EAC）研究的最新进展，提出了海底管线钢腐蚀疲劳（CF）的裂纹扩展模型。该模型采用两部分结构，这与CF是应力腐蚀（SC）和氢辅助裂化（HAC）的混合过程这一物理事实相一致。阳极溶解（AD）和氢脆（HE）被认为是造成SC和HAC的原因，它们的模型已整合到断裂力学框架内的通用模型中。然后将该模型应用于X65管线钢的CF裂纹扩展建模，结果表明，使用该模型可以很好地控制建模的裂纹扩展曲线的形状，并且可以捕获加剧的裂纹率和行为特征。适当考虑机械和环境参数的影响，例如加载频率，应力比，温度和氢浓度等。

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