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On the choice of damage variable in the continuum fatigue model based on a moving endurance surface

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientific

Details

Original languageEnglish
Title of host publicationProceedings of the XII Finnish Mechanics Day
Pages57-62
Number of pages6
ISBN (Electronic)978-952-93-5608-9
Publication statusPublished - May 2015
Publication typeB3 Non-refereed article in conference proceedings
EventFinnish Mechanics Days -
Duration: 1 Jan 1900 → …

Conference

ConferenceFinnish Mechanics Days
Period1/01/00 → …

Abstract

This paper considers two different damage formulations for modelling high-cycle fatigue of materials. The underlying fatigue model is formulated within continuum mechanics framework with the concept of a moving endurance surface. Such a model has a unique feature that it allows for the concepts of fatigue limits and damage accumulation during the load history thus avoiding cycle-counting techniques. A Scalar and tensor type of damage variables are utilized with an essentially similar type of damage evolution law. The tensor damage model capable of accounting for damage induced anisotropy is based on the gradient of the endurance surface. The performance of the scalar and tensor damage formulations are compared with different multidimensional stress histories.

Keywords

  • high-cycle fatigue modelling, isotropic damage, anisotropic damage, endurance surface, evolution equations

Publication forum classification

Field of science, Statistics Finland