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Creep relaxation in the presence of residual stress

Nezhad, H. Y. ORCID: 0000-0003-0832-3579 and O'Dowd, N. P. (2015). Creep relaxation in the presence of residual stress. Engineering Fracture Mechanics, 138, pp. 250-264. doi: 10.1016/j.engfracmech.2015.03.037

Abstract

In this paper, the elastic and elastic–plastic creep behaviour of cracked structures in the presence of a residual stress field have been studied, numerically and analytically. A self-equilibrating residual stress field is introduced by prior mechanical loading. The magnitude of the residual stress field is varied and the corresponding transient crack tip parameter, , is evaluated in single edge notched specimens, using the finite element (FE) method. Since the steady state crack tip parameter, , and redistribution time, , are no longer valid for the case of residual stress only (as for this case and thus ), new normalising factors of and are introduced and used to normalise and time, respectively. Existing analytical solutions are modified based on these normalising factors, to describe creep relaxation in the presence of a residual stress field. The values of obtained from FE analysis are compared to those from the proposed equations. It has been found that the transient value provides an accurate characterisation of the crack tip fields under residual stress only.

Publication Type: Article
Additional Information: © 2015. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Publisher Keywords: Residual stress; Creep relaxation; Finite element; Reference stress method
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Departments: School of Mathematics, Computer Science & Engineering > Engineering > Mechanical Engineering & Aeronautics
Date Deposited: 18 Nov 2020 14:17
URI: https://openaccess.city.ac.uk/id/eprint/25260
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