南京航空航天大学k8凯发集团主页平台管理系统 郭万林-k8凯发集团

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所属单位：航空学院

发表刊物：international journal of solids and structures

关键字：creeping crack border fields two-parameter description c(r)-t-z three-parameter description c(t)-t-z-t-q* through-thickness cracks corner cracks surface cracks

摘要：creeping fracture in engineering always occurs in high temperature structures with complicated geometries and loading configurations, and how to characterize the three-dimensional crack border stress fields is essentially important to design of the structures. by comprehensive finite element analyses of specimens with through-the-thickness cracks and specimens with corner, surface and embedded elliptic cracks, we demonstrated that a three-parameter characterization based on c(t) integral, the out-of-plane stress constraint factor t-z and in-plane constraint coefficient q* can be efficiently applied in all cases. it is shown that a two-parameter c(t)-t-z solution can provide efficient prediction for the stress field ahead of the crack under small scale creep condition. under large scale creep conditions, it is found that tz has nearly a unified distribution ahead of cracks, and the three-parameter c(t)-t-z solution can characterize the crack front stress fields efficiently. this universal characterization of the creeping crack front stress field should serve as a solid fundamental for three-dimensional damage tolerant design of high temperature structures. (c) 2018 elsevier ltd. all rights reserved.

issn号：0020-7683

是否译文：否

发表时间：2018-11-01

合写作者：chen, zhiyuan,佘崇民

通讯作者：郭万林