Creep relaxation of residual stresses around cold expanded holes

A. A. Garcia-Granada, V. D. Lacarac, P. Holdway, D. J. Smith, M. J. Pavier

Producció científica: Article en revista indexadaArticleAvaluat per experts

24 Cites (Scopus)


The cold expansion of fastener holes in aircraft components is a standard technique to improve fatigue life. There is concern that the beneficial residual stresses arising from cold expansion may relax due to creep. This paper describes experimental measurement and finite element prediction of cold expansion residual stresses and their redistribution after creep, with and without additional mechanical load. Experimental measurements of near-surface stresses used an X-ray diffraction technique while average through-the-thickness stresses were measured using a new method based on Sachs' boring. This new method allowed non-axisymmetric residual stresses to be measured, as was the case when creep relaxation occurred with mechanical load. Axisymmetric and three dimensional finite element analyses were used to predict the stress distribution through the thickness of the component showing good agreement with measurement. Creep relaxation of residual stress does indeed occur, but some benefit of the cold expansion remains, particularly when creep relaxation is combined with the application of mechanical load.

Idioma originalAnglès
Pàgines (de-a)125-131
Nombre de pàgines7
RevistaJournal of Engineering Materials and Technology
Estat de la publicacióPublicada - de gen. 2001
Publicat externament


Navegar pels temes de recerca de 'Creep relaxation of residual stresses around cold expanded holes'. Junts formen un fingerprint únic.

Com citar-ho