Coupling of phase field and viscoplasticity for modelling cyclic softening and crack growth under fatigue
Coupling of phase field and viscoplasticity for modelling cyclic softening and crack growth under fatigue
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DOI：
10.1016/j.euromechsol.2021.104472
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发表时间：
2022
期刊：
影响因子：
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通讯作者：
J. Song;L.G. Zhao;H. Qi;S. Li;D. Shi;J. Huang;Y. Su;K. Zhang
中科院分区：
文献类型：
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作者：
J. Song;L.G. Zhao;H. Qi;S. Li;D. Shi;J. Huang;Y. Su;K. Zhang
提出了一种相场-粘塑性耦合方法来模拟镍基高温合金在疲劳作用下的变形和裂纹扩展。该耦合模型在预测疲劳损伤引起的合金循环软化行为方面具有优势，克服了原有循环粘塑性模型的主要局限性。耦合方法在预测峰值载荷下不同停留时间下的疲劳裂纹扩展方面也非常有效，这是裂纹在停留疲劳下扩展的重要行为。通过引入应力状态因子，进一步利用耦合模型研究了疲劳作用下三维裂纹的扩展行为。三维裂纹前缘的几何特征和整体裂纹扩展速率都得到了很好的捕捉，验证了耦合模型的预测能力。
A coupled phase field-viscoplasticity approach was developed to model the deformation and crack growth in a nickel-based superalloy under fatigue. The coupled model has an advantage in predicting the cyclic softening behavior of the alloy caused by fatigue damage, overcoming a major limitation of the original cyclic viscoplasticity model. The coupled approach is also highly effective in predicting fatigue crack propagation under varied dwell times at peak load, an important behavior for crack growth under dwell fatigue. By incorporating the stress state factor, the coupled model is further utilized to investigate the growth behavior of 3D cracks under fatigue. Both the geometrical feature of the 3D crack front and the overall crack growth rate are well captured, confirming the predicative capability of the coupled model.