FATIGUE CRACK-GROWTH AND CLOSURE BEHAVIOR THROUGH A COMPRESSIVE RESIDUAL-STRESS FIELD

被引：55

作者：

KANG, KJ ^{[1
]}

SONG, JH ^{[1
]}

EARMME, YY ^{[1
]}

机构：

[1] KOREA ADV INST SCI & TECHNOL,DEPT MECH ENGN,POB 150,SEOUL 131,SOUTH KOREA

来源：

FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES | 1990年 / 13卷 / 01期

关键词：

D O I：

10.1111/j.1460-2695.1990.tb00572.x

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Behaviour of fatigue crack growth and closure through a compressive residual stress field is investigated by performing fatigue crack growth tests on welded SEN specimens of a structural steel (JIS SM50A). Depending on the type of the initial residual stress in the region of crack growth, the growth and closure of the crack show different behaviour. In particular, in the transition region from a compressive residual stress field to a tensile residual stress field, the fatigue crack growth rates cannot be described by the effective stress intensity factor range ΔKeff, based on the measured crack opening stress intensity factor Kop. Also it is found that the R'‐method using the data of da/dN vs ΔK for residual stress‐free specimens, with the effective stress ratio R'[=(Kmax+Kr)/(Kmin+Kr)], gives non‐conservative predictions of the growth rates in the transition region. Observations of crack closure behaviour in this study indicates that partial opening of the crack occurs and this plays an important role in crack growth through a compressive residual stress field. Based on the concept of a partial opening point (defined and measured in this work), fatigue crack growth behaviour can be better explained. Copyright © 1990, Wiley Blackwell. All rights reserved

引用

页码：1 / 13

页数：13

共 22 条

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