Creep crack simulations using continuum damage mechanics and extended finite element method
Creep crack simulations using continuum damage mechanics and extended finite element method
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DOI：
10.1177/1056789517737593
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发表时间：
2019
影响因子：
4.2
通讯作者：
VB Pandey;Ivjot Singh;B. Mishra;S. Ahmad;A. Rao;V. Kumar
中科院分区：
文献类型：
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作者：
VB Pandey;Ivjot Singh;B. Mishra;S. Ahmad;A. Rao;V. Kumar
本文采用连续损伤力学和扩展有限元方法进行了弹塑性蠕变裂纹扩展模拟。采用Liu-Murakami蠕变损伤模型和显式时间积分法计算不同温度下不同材料的蠕变应变和损伤变量。选取致密拉伸试样和c形拉伸试样进行裂纹扩展模拟分析。损伤评估采用了局部和非局部两种方法。通过与实验结果和有限元解的比较，验证了扩展有限元法解的准确性。这些结果表明，扩展有限元法需要更粗的网格来有效地模拟裂纹扩展。通过非局部实现可以获得与网格无关的结果。
In the present work, elasto-plastic creep crack growth simulations are performed using continuum damage mechanics and extended finite element method. Liu–Murakami creep damage model and explicit time integration scheme are used to evaluate the creep strain and damage variable for various materials at different temperatures. Compact tension and C-shaped tension specimens are selected for the simulation of crack growth analysis. For damage evaluation, both local and nonlocal approaches are employed. The accuracy of the extended finite element method solutions is checked by comparing with experimental results and finite element solutions. These results show that the extended finite element method requires a much coarser mesh to effectively model crack propagation. It is also shown that mesh independent results can be achieved by using nonlocal implementation.