Creep relaxation in the presence of residual stress

Show simple item record Yazdani Nezhad, Hamed O'Dowd, N. P. 2016-07-25T09:06:45Z 2016-07-25T09:06:45Z 2015-03-28
dc.identifier.citation H. Yazdani Nezhad, N.P. O’Dowd, Creep relaxation in the presence of residual stress, Engineering Fracture Mechanics, Volume 138, April 2015, Pages 250-264 en_UK
dc.identifier.issn 0013-7944
dc.description.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, C(t), is evaluated in single edge notched specimens, using the finite element (FE) method. Since the steady state crack tip parameter, C∗, and redistribution time, tred, are no longer valid for the case of residual stress only (as for this case C∗→0 and thus tred→∞), new normalising factors of Cnorm and tnorm are introduced and used to normalise C(t) 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 C(t) obtained from FE analysis are compared to those from the proposed equations. It has been found that the transient C(t) value provides an accurate characterisation of the crack tip fields under residual stress only. en_UK
dc.language.iso en en_UK
dc.publisher Elsevier en_UK
dc.subject Residual stress en_UK
dc.subject Creep relaxation en_UK
dc.subject Finite element en_UK
dc.subject Reference stress method en_UK
dc.title Creep relaxation in the presence of residual stress en_UK
dc.type Article en_UK

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