Cohesive zone modelling of low cycle fatigue cracks in cracked and notched specimens
Cohesive zone modelling of low cycle fatigue cracks in cracked and notched specimens
复制标题
DOI：
10.1111/ffe.12061
复制
发表时间：
2013-12
影响因子：
3.7
通讯作者：
H. Li;Huang Yuan
中科院分区：
文献类型：
--
作者：
H. Li;Huang Yuan
研究了循环内聚区模型 (CZM) 与扩展有限元法相结合，研究了不同载荷条件下 C(T) 试样中延性材料疲劳裂纹的萌生和扩展。详细的实验验证证实，已知的 CZM 无法正确预测疲劳裂纹中加载比的影响。将载荷比纳入损伤演化方程可以正确描述载荷比。 CZM 用于预测深缺口 C(T) 样本中的疲劳裂纹形核和扩展。模拟显示与疲劳裂纹扩展稳定阶段的实验数据相当一致，并显示出统一描述疲劳裂纹形核和扩展的潜力。
A cyclic cohesive zone model (CZM) combined with the extended finite element method for the fatigue crack initiation and propagation in ductile materials was investigated under different loading conditions in C(T) specimens. Detailed experimental verification confirmed the known CZM could not predict effects of the loading ratio in fatigue crack properly. Including the loading ratio into the damage evolution equation described the loading ratio correctly. The CZM was used to predict both fatigue crack nucleation and propagation in a deep notched C(T) specimen. The simulations displayed reasonable agreement with experimental data in the stable stage of fatigue crack propagation and showed the potential for a unified description of fatigue crack nucleation and growth.