The interaction of fatigue cracks with a residual stress field using thermoelastic stress analysis and synchrotron X-ray di raction experiments

AMJAD, Khurram, ASQUITH, David, EANN, Patterson, SEBASTIAN, Chris and WANG, Wei-Chun (2017). The interaction of fatigue cracks with a residual stress field using thermoelastic stress analysis and synchrotron X-ray di raction experiments. Royal Society Open Science, 4 (171100).

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Link to published version:: 10.1098/rsos.171100

Abstract

This article presents an experimental study on the fatigue behaviour of cracks emanating from cold-expanded holes utilizing thermoelastic stress analysis (TSA) and synchrotron X-ray diffraction (SXRD) techniques with the aim of resolving the long-standing ambiguity in the literature regarding potential relaxation, or modification, of beneficial compressive residual stresses as a result of fatigue crack propagation. The crack growth rates are found to be substantially lower as the crack tip moved through the residual stress zone induced by cold expansion. The TSA results demonstrated that the crack tip plastic zones were reduced in size by the presence of the residual compressive stresses induced by cold expansion. The crack tip plastic zones were found to be insignificant in size in comparison to the residual stress zone resulting from cold expansion, which implied that they were unlikely to have had a notable impact on the surrounding residual stresses induced by cold expansion. The residual stress distributions measured along the direction of crack growth, using SXRD, showed no signs of any significant stress relaxation or redistribution, which validates the conclusions drawn from the TSA data. Fractographic analysis qualitatively confirmed the influence on crack initiation of the residual stresses induced by the

Item Type: Article
Research Institute, Centre or Group: Materials and Engineering Research Institute > Structural Materials and Integrity Research Centre > Centre for Corrosion Technology
Identification Number: 10.1098/rsos.171100
Depositing User: David Asquith
Date Deposited: 22 Nov 2017 17:23
Last Modified: 25 Nov 2017 06:42
URI: http://shura.shu.ac.uk/id/eprint/17343

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