Does the cyclic J-integral ΔJ describe the crack-tip opening displacement in the presence of crack closure?

被引：24

作者：

Metzger, M. ^{[1
,2
]}

Seifert, T. ^{[1
]}

Schweizer, C. ^{[2
]}

机构：

[1] Univ Appl Sci Offenburg, D-77652 Offenburg, Germany

[2] Fraunhofer Inst Mech Mat IWM, D-79108 Freiburg, Germany

来源：

ENGINEERING FRACTURE MECHANICS | 2015年 / 134卷

关键词：

J-integral; Cyclic J; Fatigue crack growth; Crack closure; Finite-element analysis; FATIGUE; GROWTH;

D O I：

10.1016/j.engfracmech.2014.07.017

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

In this paper, the correlation of the cyclic J-integral, Delta J, and the cyclic crack-tip opening displacement, Delta CTOD, is studied in the presence of crack closure to assess the question if Delta J describes the crack-tip opening displacement in this case. To this end, a method is developed to evaluate Delta J numerically within finite-element calculations. The method is validated for an elastic-plastic material that exhibits Masing behavior. Different strain ranges and strain ratios are considered under fully plastic cyclic conditions including crack closure. It is shown that the cyclic J-integral is the parameter to determine the cyclic crack-tip opening displacement even in cases where crack closure is present. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：459 / 473

页数：15

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