Numerical simulation of fish-eye fatigue crack growth in very high cycle fatigue
Numerical simulation of fish-eye fatigue crack growth in very high cycle fatigue
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DOI：
10.1016/j.engfracmech.2015.01.010
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发表时间：
2015-02-01
影响因子：
5.4
通讯作者：
Bathias, C.
中科院分区：
文献类型：
--
作者：
Nguyen, H. Q.;Gallimard, L.;Bathias, C.
本文用数值方法研究了高周疲劳中鱼眼裂纹形核后的扩展规律。裂纹扩展速率由Paris-Hertzberg定律模拟。基于三维有限元分析的迭代程序进行裂纹扩展模拟。虚拟裂纹闭合技术被用来计算裂纹扩展过程中的每一步的应力强度因子。然后，这些应力强度因子被用来估计疲劳裂纹扩展的初始和最终裂纹长度之间的疲劳裂纹的法律整合。我们的目标是双重的：一是研究裂纹尖端接近结构边缘时鱼眼形状的变化，二是研究在解析解不可得或不够可靠的情况下疲劳裂纹扩展寿命的演化。(C)2015爱思唯尔有限公司版权所有。
In this paper, we numerically study the fish-eye fatigue crack growth after crack nucleation for very high cycle fatigue. The crack growth rate is modeled by the Paris-Hertzberg law. An iterative procedure based on three dimensional finite element analyses is developed to conduct crack growth simulations. The virtual crack closure technique is used to calculate the stress intensity factor for each step of the crack growth process. These stress intensity factors are then used to estimate the fatigue crack growth by integrating the fatigue crack law between the initial and final crack lengths. Our objectives are twofold: first is to study the variation of the fish-eye shape when the crack tip approaches the edge of structure, second is to study the evolution of the fatigue crack growth life when analytical solutions are not available or not sufficiently reliable. (C) 2015 Elsevier Ltd. All rights reserved.