局所破壊解析法による複数分布する低サイクル疲労き裂の進展挙動解析

概要

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Some types of fatigue loading such as thermal fatigue may result in possible distribution of many cracks that are oriented in random directions. Numerical simulation of the fatigue crack propagation as well as stress analysis by conventional finite element method for such a situation requires huge amount of time and computational resources. The objective of the present study is to resolve this difficulty by employing the local approach of fracture based on continuum damage mechanics (CDM). The anisotropic damage variable developed in the authors' previous study is applied to represent a fatigue crack. Following the normal CDM approach with this damage variable and assumptions on crack opening/closing and damage evolution, numerical simulations are conducted for low cycle fatigue crack propagation behavior of a plate with single and two cracks. The results show good agreement with the experiments. Finally, propagations of multiply distributed cracks under low cycle fatigue loading are simulated to demonstrate the potential applicability of the present approach.
一般社団法人日本機械学会の論文
2002-04-25