Crack growth prediction method considering interaction between multiple cracks (Growth of surface cracks of dissimilar size under cyclic tensile and bending load)

被引：0

作者：

Kamaya M. ^{[1
]}

Miyokawa E. ^{[1
]}

Kiikuch M. ^{[1
]}

机构：

[1] Tokyo University of Science of Mechaffical Engineering, Noda Chiba, 278-8510

来源：

Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A | 2011年 / 77卷 / 775期

关键词：

Crack Propagation; Finite Element Method; Fitness-for-Service Code; Interaction; Multiple Cracks; Stress Intensity Factor;

D O I：

10.1299/kikaia.77.552

中图分类号：

学科分类号：

摘要：

When multiple cracks approach one another, the stress intensity factor is likely to change due to the interaction of the stress field. This causes change in growth rate and shape of cracks. In particular, when cracks are in parallel position to the loading direction, the shape of cracks becomes non-planar. In this study, the complex growth of interacting cracks is evaluated by using the S-Version finite element method, in which local detailed finite element mesh (local mesh) is superposed on coarse finite element model (global mesh) representing the global structure. In order to investigate the effect of interaction on the growth behavior, two parallel surface cracks are subjected to cyclic tensile or bending load. It is shown that the smaller crack is shielded by larger crack due to the interaction and stops growing when the diffeitnce in size of two cracks is significant. Based on simulations of various conditions, a procedure and criteria for evaluating crack growth for fitness-for-service assessment is proposed. According to the procedure, the interaction is not necessary to be considered in the crack growth prediction when the difference in size of two cracks exceeds the criterion.

引用

页码：552 / 563

页数：11

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