A generalised, multi-phase-field theory for dissolution-driven stress corrosion cracking and hydrogen embrittlement
A generalised, multi-phase-field theory for dissolution-driven stress corrosion cracking and hydrogen embrittlement
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DOI：
10.1016/j.jmps.2022.104951
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发表时间：
2022-06-06
影响因子：
5.3
通讯作者：
Martinez-Paneda, Emilio
中科院分区：
文献类型：
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作者：
Cui, Chuanjie;Ma, Rujin;Martinez-Paneda, Emilio
我们提出了一个基于相场的电化学-力学公式，用于模拟弹塑性固体中的力学强化腐蚀和氢助开裂。采用多相场方法首次提出了应力腐蚀开裂的一般框架，包括阳极溶解和氢脆机制。我们用有限元方法对我们的理论进行了数值实现，将位移分量、相场腐蚀序参数、金属离子浓度、相场断裂序参数和氢浓度定义为主场。具有代表性的案例研究旨在展示该模型在各种材料和环境中的预测能力，与基准测试和实验观察取得了有希望的一致。我们表明，作为环境的函数，所给出的普遍公式可以捕捉到阳极溶解和氢驱动的失效机制之间的相互作用；包括从一种到另一种的转变，它们的协同作用和它们各自的发生。通过为Gruhl的开创性实验提供第一个模拟结果，这种概括性的框架可以为环境-材料相互作用和对应力腐蚀破裂的理解带来新的见解。
We present a phase field-based electro-chemo-mechanical formulation for modelling mechanics-enhanced corrosion and hydrogen-assisted cracking in elastic-plastic solids. A multi-phase-field approach is used to present, for the first time, a general framework for stress corrosion cracking, incorporating both anodic dissolution and hydrogen embrittlement mechanisms. We numerically implement our theory using the finite element method and defining as primary fields the displacement components, the phase field corrosion order parameter, the metal ion concentration, the phase field fracture order parameter and the hydrogen concentration. Representative case studies are addressed to showcase the predictive capabilities of the model in various materials and environments, attaining a promising agreement with benchmark tests and experimental observations. We show that the generalised formulation presented can capture, as a function of the environment, the interplay between anodic dissolution-and hydrogen -driven failure mechanisms; including the transition from one to the other, their synergistic action and their individual occurrence. Such a generalised framework can bring new insight into environment-material interactions and the understanding of stress corrosion cracking, as demonstrated here by providing the first simulation results for Gruhl's seminal experiments.