Lifetime of semi-ductile materials through the critical plane approach

This paper presents the results of fatigue strength estimation depending on the variable orientation of the critical plane for proportional and non-proportional bending and torsion with regard to specimens made of aluminium alloy 2017A. The algorithm applied for the fatigue strength evaluation is based on the Carpinteri-Spagnoli proposal and its subsequent modifications in accordance with the ideas developed by the authors. The objective of this paper is to search for a model which offers the best possible results of fatigue strength estimation for materials with properties which are intermediate between elastic-brittle and elastic-plastic, such as aluminium alloys, and a further insight into them with regard to their fatigue strength. Crown Copyright (C) 2013 Published by Elsevier Ltd. All rights reserved.