Evolution of residual stresses with fatigue loading and subsequent crack growth in a welded aluminium alloy middle tension specimen

被引：32

作者：

Liljedahl, C. D. M. ^{[1
]}

Tan, M. L. ^{[1
]}

Zanellato, O. ^{[1
]}

Ganguly, S. ^{[1
]}

Fitzpatrick, M. E. ^{[1
]}

Edwards, L. ^{[1
]}

机构：

[1] Open Univ, Fac Technol, Dept Mat Engn, Milton Keynes MK7 6AA, Bucks, England

来源：

ENGINEERING FRACTURE MECHANICS | 2008年 / 75卷 / 13期

关键词：

residual stresses; neutron diffraction; weld; fatigue crack growth;

D O I：

10.1016/j.engfracmech.2008.02.005

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

Neutron diffraction has been used to measure the evolution of the residual stresses in a VPPA welded Al-2024 alloy middle tension (M(T)) specimen with fatigue loading and subsequent crack growth. The measurements were carried out on the diffractometer ENGIN-X, a time-of-flight instrument, at the ISIS Pulsed Neutron Source. Fatigue crack growth was performed in situ and strain measurements averaged through the thickness of the specimen were made along two orthogonal directions as the crack grew, allowing the stresses in the specimen to be calculated assuming plane stress. 2D finite element simulation of the evolution of the initial residual stress field with crack growth, using an elastic model produced predictions that were in reasonable agreement with the experimental results. The results further indicate that some re-distribution of the residual stress field occurred due to the crack tip plasticity associated with the fatigue loading. (C) 2008 Elsevier Ltd. All rights reserved.

引用

页码：3881 / 3894

页数：14

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