Acceleration of fatigue crack growth due to occasional mode II loading in 7075 aluminum alloy

被引：5

作者：

Matsunaga, H. ^{[1
,2
,3
]}

Makizaki, M. ^{[4
]}

Socie, D. F. ^{[5
]}

Yanase, K. ^{[3
,6
]}

Endo, M. ^{[3
,6
]}

机构：

[1] Kyushu Univ, Dept Mech Engn, Fukuoka 812, Japan

[2] Int Inst Carbon Neutral Energy Res WPI 12CNER, Fukuoka, Japan

[3] Fukuoka Univ, Inst Mat Sci & Technol, Fukuoka 81401, Japan

[4] Fukuoka Univ, Grad Sch, Fukuoka 81401, Japan

[5] Univ Illinois, Dept Mech Sci & Engn, Urbana, IL 61801 USA

[6] Fukuoka Univ, Dept Mech Engn, Fukuoka 81401, Japan

来源：

ENGINEERING FRACTURE MECHANICS | 2014年 / 123卷

关键词：

Fatigue crack growth; Occasional shear loading; Shear-mode growth; 7075 Aluminum alloy; Crack closure; PROPAGATION; REDUCTION; THRESHOLD; STEEL;

D O I：

10.1016/j.engfracmech.2014.04.015

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

The effect of an occasional mode II loading on the subsequent mode I fatigue crack growth was investigated in a thin-walled 7075-T6511 aluminum alloy tube. Careful observation of crack growth behavior revealed that an occasional mode II loading has two contrasting effects on the subsequent crack growth. First is a retardation effect that is associated with a crack closure development due to the mode II loading. However, this effect was insignificant with respect to the crack growth life as a whole. Second is an acceleration effect that is associated with an accelerated crack growth rate in mode II. It was found that, in a relatively high Delta K regime, mode II crack growth was from one to two orders of magnitude faster than mode I crack growth. This study shows that mode II crack growth should be considered as a predominant factor in evaluating the effect of an occasional mode II loading for a mode I crack in 7075 aluminum alloy. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：126 / 136

页数：11

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