Fatigue Crack Growth Simulation Using S-FEM
Fatigue Crack Growth Simulation Using S-FEM
复制标题
使用 S-FEM 进行疲劳裂纹扩展模拟
DOI：
10.1299/kikaia.74.812
复制
发表时间：
2008
期刊：
影响因子：
--
通讯作者：
Masafumi Takahashi
中科院分区：
文献类型：
--
作者：
M. Kikuchi;Y. Wada;Masafumi Takahashi
采用叠加有限元法（S-FEM）模拟了复合加载条件下的疲劳裂纹扩展。采用S-FEM技术，只需重新划分局部网格，便于模拟裂纹扩展。结合网格重划技术，实现了局部网格的自动重划，并可方便地模拟弯曲裂纹路径。首先解决了斜裂纹问题。结果表明，计算结果与常规解一致，验证了该方法的有效性。计算了应力强度因子，讨论了裂纹间的相互作用。将计算结果与裂纹贯通准则进行了比较，验证了该准则的合理性。
Fatigue crack growth under mixed mode loading conditions is simulated using Superimposed-FEM (S-FEM). By using S-FEM technique, only local mesh should be re-meshed and it becomes easy to simulate crack growth. By combining with re-meshing technique, local mesh is re-meshed automatically, and curved crack path is modeled easily. At first, slant crack problem is solved. It is shown that results agree with conventional solutions, and verified the availability of this technique.Then two-crack problems are solved in several cases by changing each crack location. Stress intensity factors are evaluated and interaction effect between two cracks is discussed. Results are compared with crack coalescence criteria, and it is verified that these criteria are reasonable ones.