Notch effect on multiaxial low cycle fatigue

This paper discusses the notch effect on multiaxial low cycle fatigue. Neuber's rule was firstly introduced to estimate local strains at the notch root in proportional tension and torsion loading. The Neuber's rule was applied to estimate crack initiation and propagation lives in tension-torsion low cycle fatigue. The rule conservatively estimated the crack initiation life in tension low cycle fatigue and appropriately in torsion low cycle fatigue. A simple method for estimating the local strain at the notch root was proposed in tension and torsion loading. The notch effect in nonproportional low cycle fatigue was discussed in two materials. The local strain at the notch root obtained by finite element analysis underestimated the crack initiation lives for the additional hardening material but that obtained by the Neuber's rule overestimated for the non-additional hardening material. (C) 2011 Elsevier Ltd. All rights reserved.