On the interaction of normal and shear stresses in multiaxial fatigue damage. Issue 9 (23rd June 2019)

• Record Type: Journal Article
• Authors: Sharifimehr, Shahriar; Fatemi, Ali
• Other Names: Hong Youshi guestEditor.; Susmel Luca guestEditor.; Berto Filippo guestEditor.; Neu Richard W. guestEditor.; Endo Masahiro guestEditor.
• Is Part Of: Fatigue & fracture of engineering materials & structures. Volume 42:Issue 9(2019)
• Page Start: 2000
• Page End: 2016
• Publication Date: 2019-06-23
• Subjects: multiaxial fatigue analysis -- normal and shear stress interactions -- variable amplitude loading; Materials -- Fatigue -- Periodicals; Fracture mechanics -- Periodicals; 620.1123
• DOI: 10.1111/ffe.13070
• Languages: English
• ISSNs: 8756-758X

Abstract

Abstract: One of the important issues in assessing multiaxial fatigue damage is interactions between different components of stress such as normal and shear stresses. The present study investigated this interaction effect on the fatigue behavior of materials with shear failure mode when subjected to multiaxial loading conditions. A method is introduced to model this interaction based on the idea that two types of influence are caused by the normal stress acting on the critical plane orientation. These two types of influence are affecting roughness induced closure, as well as fluctuating normal stress which affects the growth of small cracks in mode II. Shear‐based critical plane damage models which use normal stress as a secondary input, such as FS damage model, could then use the summation of these terms. In order to investigate the effect of the method, constant amplitude load paths with different levels of interaction between the normal and shear stresses, as well as variable amplitude tests with histories both taken from service loading conditions and generated using random numbers were designed for an experimental program. The proposed method was observed to result in improved fatigue life estimations where significant interactions between normal and shear stresses exist.