A two-level non-intrusive coupling method for fatigue analysis
作者单位：School of Aeronautics Northwestern Polytechnical University
会议名称：《2016年航空科学与技术全国博士生学术论坛》
会议日期：2016年
学科分类：08[工学] 0825[工学-航空宇航科学与技术]
摘 要：In the present paper, based on the non-intrusive coupling concept and the continuum damage mechanics, a two-level non-intrusive coupling strategy for fatigue analysis procedure is developed to efficiently and accurately predict the fatigue damage of critical details in a large structure. Coupled multi-scale models including the global structure（coarse mesh） and local details（fine mesh） are involved to evaluate fatigue damage in local details and their effect on the global structure. In this method, the fatigue analysis in critical region is divided into two levels – the local boundary condition update and the local fatigue analysis. In the first level, the external cyclic load is transferred from global scale to the local scale. And in the second level, the local fatigue analysis driven by the local cyclic boundary is carried out. The computational procedure of this two-level analysis can be fully coupled, semi-coupled or uncoupled according to different scenarios. Furthermore, the low-cycle fatigue damage is studied and the corresponding fatigue life predictions are simulated on a plate with a central circular hole under cyclic loading. The results reveal that the present method greatly improves the numerical efficiency and accords well with the traditional FE analysis with global fine mesh.