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A continuum based macroscopic unified low- and high cycle fatigue model

Research output: Contribution to journalConference articleScientificpeer-review

Details

Original languageEnglish
Article number16008
Number of pages8
JournalMATEC Web of Conferences
Volume300
DOIs
Publication statusPublished - 2 Dec 2019
Publication typeA1 Journal article-refereed
EventInternational Conference on Multiaxial Fatigue and Fracture - Bordeaux, France
Duration: 24 Jun 201926 Jun 2019

Abstract

In this work, an extension of a previously developed continuum based high-cycle fatigue model is enhanced to also capture the low-cycle fatigue regime, where significant plastic deformation of the bulk material takes place. Coupling of the LCFand HCF-models is due to the damage evolution equation. The high-cycle part of the model is based on the concepts of a moving endurance surface in the stress space with an associated evolving isotropic damage variable. Damage evolution in the low-cycle part is determined via plastic deformations and endurance function. For the plastic behaviour a non-linear isotropic and kinematic hardening J2-plasticity model is adopted. Within this unified approach, there is no need for heuristic cycle-counting approaches since the model is formulated by means of evolution equations, i.e. incremental relations, and not changes per cycle. Moreover, the model is inherently multiaxial and treats the uniaxial and multiaxial stress histories in the same manner. Calibration of the model parameters is discussed and results from some test cases are shown.

Publication forum classification

Field of science, Statistics Finland