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

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