A phase field model for hydrogen-assisted fatigue
A phase field model for hydrogen-assisted fatigue
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DOI：
10.1016/j.ijfatigue.2021.106521
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发表时间：
2022-01-01
影响因子：
6
通讯作者：
Martinez-Paneda, Emilio
中科院分区：
文献类型：
--
作者：
Golahmar, Alireza;Kristensen, Philip K.;Martinez-Paneda, Emilio
我们提出了一个新的理论和数值相场为基础的公式预测氢辅助疲劳。耦合变形-扩散-损伤模型能够预测任意加载模式和试样几何形状的疲劳裂纹形核和扩展。氢在增加疲劳裂纹扩展速率和减少失效循环次数中的作用进行了研究。我们的数值实验，使映射的三个加载频率制度，自然恢复巴黎法律行为的各种氢浓度。此外，得到了缺口和光滑试样的虚S-N曲线，与实验结果吻合较好。
We present a new theoretical and numerical phase field-based formulation for predicting hydrogen-assisted fa-tigue. The coupled deformation-diffusion-damage model presented enables predicting fatigue crack nucleation and growth for arbitrary loading patterns and specimen geometries. The role of hydrogen in increasing fatigue crack growth rates and decreasing the number of cycles to failure is investigated. Our numerical experiments enable mapping the three loading frequency regimes and naturally recover Paris law behaviour for various hydrogen concentrations. In addition, Virtual S-N curves are obtained for both notched and smooth samples, exhibiting a good agreement with experiments.