TY - JOUR

T1 - Phase-field modelling for fatigue crack growth under laser shock peening-induced residual stresses

AU - Seiler, Martha

AU - Keller, Sören

AU - Kashaev, Nikolai

AU - Klusemann, Benjamin

AU - Kästner, Markus

N1 - The group of M. Kästner thanks the German Research Foundation DFG which supported this work within the Priority Programme 2013 “Targeted Use of Forming Induced Residual Stresses in Metal Components” with Grant number KA 3309/7-2. The authors would like to thank M. Horstmann and H. Tek for the specimen preparation and performing the fatigue tests.

PY - 2021/8/1

Y1 - 2021/8/1

N2 - 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.

AB - 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.

KW - Fatigue crack growth

KW - Laser shock peening

KW - Phase-field modelling

KW - Residual stresses

KW - Engineering

UR - http://www.scopus.com/inward/record.url?scp=85103345942&partnerID=8YFLogxK

U2 - 10.1007/s00419-021-01897-2

DO - 10.1007/s00419-021-01897-2

M3 - Journal articles

AN - SCOPUS:85103345942

VL - 91

SP - 3709

EP - 3723

JO - Archive of Applied Mechanics

JF - Archive of Applied Mechanics

SN - 0939-1533

IS - 8

ER -