Author(s)

Ph. Darcis, J. Li & N. Recho

Abstract

Calculation of the stress intensity factor variation due to residual stress following an overload Ph. Darcis, J. Li & N. Recho LERMES, Laboratoire dJEtudes et de Recherche en MEcanique de Structures, Universite' Blaise Pascal - Clermont 11, France Abstract In this paper, we propose a new approach to model the loading interaction effect due to the overload during fatigue constant amplitude loading. This approach concerns the retardation period immediately following the overload, until the minimum fatigue crack growth rate is reached. The calculation of this minimum crack growth rate, after an overload, depends on the calculation of the restriction amount of the stress intensity factor KR, which may have several definitions: - The first corresponds to the opening stress intensity factor due to Elber [I] KOP= KR. - The second, KpR = KR, was introduced by Lang and Marci [2], in order to distinguish the principal mechanism of the crack growth propagation. This parameter was established following

Keywords