Performance Evaluation of Laser Shock Peening of Blisk

Laser shock peening of blisks has been used domestically for more than ten years, but there is no uniform standard for the performance evaluation of blisks/blades after laser shock peening. This paper introduces the requirements of anti-FOD and improve high and low cycle fatigue properties to blades, and analyzes the development and performance evaluation methods of laser shock strengthening of blisks at home and abroad. Aiming at the performance evaluation of the blisk after strengthening, the effects of laser shock strengthening of titanium alloy blades were evaluated by plate vibration fatigue test, blade first-order vibration, and three-point bending fatigue. The results show that laser shock strengthening can significantly improve the vibration fatigue life of the blade. However, as the one-bending vibration fatigue test cannot evaluate the fatigue life of the blade with notches on the edge, the three-point bending fatigue test is more suitable for testing the FOD resistance of the laser shock strengthened blade. The three-point bending fatigue test result shows that once the edge of the blade is notched, the fatigue strength will decrease sharply. Laser shock strengthening can greatly improve the fatigue life of the notched three-point bending specimen, but it is still significantly lower than the state without notch.