TY - JOUR

T1 - Tailoring of residual stresses by specific use of defined prestress during laser shock peening

AU - Schwab, Karl Christian

AU - Keller, Sören

AU - Kashaev, Nikolai

AU - Klusemann, Benjamin

N1 - Publisher Copyright: © 2021 The Authors

PY - 2021/9/1

Y1 - 2021/9/1

N2 - The aim of the present study is to tailor laser shock peening-induced residual stresses by applying defined prestress. For this purpose, elastic prestress is introduced during laser shock peening application and subsequently released. The influence of prestress on the resulting residual stresses is investigated experimentally by a four-point bending device that allows prestressing of the specimen during laser shock peening. Furthermore, a semi-analytical model of laser shock peening, extended by a contribution accounting for the prestress, is used to determine the prestress—residual stress relationship. A linear relation between prestress and compressive residual stress is found when the resulting compressive residual stresses are in the range of 20 % – 100 % of the yield strength. Generally, tensile prestress leads to a higher magnitude and penetration depth of resulting compressive residual stress after laser shock peening. As a proof of concept, prestress was used to alter a non-equibiaxial residual stress profile into an equibiaxial one, demonstrating the applicability of prestress as an effective tool for residual stress design.

AB - The aim of the present study is to tailor laser shock peening-induced residual stresses by applying defined prestress. For this purpose, elastic prestress is introduced during laser shock peening application and subsequently released. The influence of prestress on the resulting residual stresses is investigated experimentally by a four-point bending device that allows prestressing of the specimen during laser shock peening. Furthermore, a semi-analytical model of laser shock peening, extended by a contribution accounting for the prestress, is used to determine the prestress—residual stress relationship. A linear relation between prestress and compressive residual stress is found when the resulting compressive residual stresses are in the range of 20 % – 100 % of the yield strength. Generally, tensile prestress leads to a higher magnitude and penetration depth of resulting compressive residual stress after laser shock peening. As a proof of concept, prestress was used to alter a non-equibiaxial residual stress profile into an equibiaxial one, demonstrating the applicability of prestress as an effective tool for residual stress design.

KW - Aluminium alloy

KW - Laser shock peening

KW - Mechanical tensioning

KW - Residual stress

KW - Semi-analytical model

KW - Tailoring residual stress

KW - Engineering

UR - http://www.scopus.com/inward/record.url?scp=85104641709&partnerID=8YFLogxK

U2 - 10.1016/j.jmatprotec.2021.117154

DO - 10.1016/j.jmatprotec.2021.117154

M3 - Journal articles

AN - SCOPUS:85104641709

VL - 295

JO - Journal of Materials Processing Technology

JF - Journal of Materials Processing Technology

SN - 0924-0136

M1 - 117154

ER -