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.
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页码：459 / 473
页数：15
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