Modelling the residual strength of fatigue damage at a single semicircular edge notch: Semielliptical crack and through‐the‐thickness crack

Abstract

In the present paper, computational framework for fatigue performance analysis of a semicircular edge notch with a through‐the‐thickness crack or a semielliptical crack is discussed. The failure behaviour of such configurations is theoretically examined through the stress‐intensity analysis and residual life estimation. The stress field of a damaged notch configuration is herein investigated by employing analytical and numerical approaches. Further, a fracture mechanics–based methodology, developed for fatigue life assessment, is taking into account the crack growth model proposed by Huang and Moan in which the stress ratio is involved. The efficiency of the obtained fatigue damage assessments, related to the edge notch configurations, is verified through appropriate experimental observations.

Weight function for an external circumferential semielliptical crack in a cylinder

“…Al‐Moayed et al 22 employed FE software ANSYS to determine the SIFs for a single semielliptical circumferential crack on a pressurized thick cylinder. Boljanović et al 23 and Boljanović and Carpinteri 24 developed a novel computational model for estimating the behaviour of a surface crack located at semicircular edge notch using FEM incorporated in the MSC/NASTRAN software package.…”