TY - JOUR

T1 - Experimental-numerical study of laser-shock-peening-induced retardation of fatigue crack propagation in Ti-17 titanium alloy

AU - Sun, Rujian

AU - Keller, Sören

AU - Zhu, Ying

AU - Guo, Wei

AU - Kashaev, Nikolai

AU - Klusemann, Benjamin

PY - 2021/4/1

Y1 - 2021/4/1

N2 - Residual stresses induced by laser shock peening in Ti-17 titanium specimens were experimentally and numerically investigated to identify the mechanisms and generation conditions of the retardation of fatigue crack propagation (FCP). The retardation was experimentally observed with fatigue life prolonged by 150%. A multi-step simulation strategy for fatigue life prediction is applied, which successfully predicts the experimentally observed FCP behavior. The fractographic observations and numerical simulation indicate that crack closure, as opposed to other microstructural influences, is the dominant effect on retardation. The studies of multi-FCP aspects show that significant retardation occurs in specimens at high values of residual stresses, small peening gap distances, and lower externally applied loads.

AB - Residual stresses induced by laser shock peening in Ti-17 titanium specimens were experimentally and numerically investigated to identify the mechanisms and generation conditions of the retardation of fatigue crack propagation (FCP). The retardation was experimentally observed with fatigue life prolonged by 150%. A multi-step simulation strategy for fatigue life prediction is applied, which successfully predicts the experimentally observed FCP behavior. The fractographic observations and numerical simulation indicate that crack closure, as opposed to other microstructural influences, is the dominant effect on retardation. The studies of multi-FCP aspects show that significant retardation occurs in specimens at high values of residual stresses, small peening gap distances, and lower externally applied loads.

KW - Fatigue crack propagation

KW - Laser shock peening

KW - Numerical simulation

KW - Residual stress

KW - Stress intensity factor

KW - Ti-17 titanium alloy

KW - Engineering

UR - http://www.scopus.com/inward/record.url?scp=85099478067&partnerID=8YFLogxK

U2 - 10.1016/j.ijfatigue.2020.106081

DO - 10.1016/j.ijfatigue.2020.106081

M3 - Journal articles

AN - SCOPUS:85099478067

VL - 145

JO - International Journal of Fatigue

JF - International Journal of Fatigue

SN - 0142-1123

M1 - 106081

ER -