Abstract
This paper examines experimentally the effect of double cold expansion on the residual stress field and fatigue behaviour of fastener holes in plates. Measurements of the hoop strain generated by the progressive drawing of the mandrel through the hole, of the retained expansion and of the surface residual stresses were performed on both cold and double cold expanded specimens. Fatigue testing and a fracture surface examination were also carried out for all specimens. It was found that double cold expansion reduces the through-thickness variation of the residual stress field generated and improves the behaviour of fastener holes under fatigue loading.
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