Phase-field modelling for fatigue crack growth under laser-shock-peening-induced residual stresses

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

Abstract

For the fatigue life of thin-walled components, not only fatigue crack initiation, but also crack growth is decisive. The phase-field method for fracture is a powerful tool to simulate arbitrary crack phenomena. Recently, it has been applied to fatigue fracture. Those models pose an alternative to classical fracture-mechanical approaches for fatigue life estimation. In the first part of this paper, the parameters of a phase-field fatigue model are calibrated and its predictions are compared to results of fatigue crack growth experiments of aluminium sheet material. In the second part, compressive residual stresses are introduced into the components with the help of laser shock peening. It is shown that those residual stresses influence the crack growth rate by retarding and accelerating the crack. In order to study these fatigue mechanisms numerically, a simple strategy to incorporate residual stresses in the phase-field fatigue model is presented and tested with experiments. The study shows that the approach can reproduce the effects of the residual stresses on the crack growth rate.

Details

Original languageEnglish
Pages (from-to)3709-3723
Number of pages15
JournalArchive of Applied Mechanics
Volume91
Issue number8
Publication statusPublished - Aug 2021
Peer-reviewedYes

External IDs

Scopus 85103345942
ORCID /0000-0003-3358-1545/work/142237122
Mendeley d5a2b850-c6b9-38d6-bdf0-6829c5bb3635
ORCID /0000-0003-4707-8377/work/172571371

Keywords

Keywords

  • Phasenfeld Eigenspannungen Ermüdungsriss