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| Process Effect on Dynamic Response Behavior of Water Confining Layer in Laser Peening |
| ZHAO Nianyou, CHENG Han, HU Yongxiang |
| (State Key Laboratory of Mechanical System and Vibration, School of Mechnical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China) |
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Abstract It is important to research the dynamic response process of water confining layer under laser shock to improve the stability and reliability of shock effect. By establishing the experimental system for observing the dynamic response process of water confining layer under laser shock, the influence of pulse energy and water pressure on dynamic response time and shock effect are analyzed. The results show that a stable water film is formed on the workpiece surface by the cylindrical jet. Under the action of high energy laser-induced plasma shock wave, water confining layer bursts and produces a lot of water mist. And then under the action of continuous jet, water confining layer quickly recovers and water mist gradually dissipates. Pulse energy and water pressure have minor effect on the dynamic response time of water confining layer and shock effect. The recovery time of water confining layer range from 4 milliseconds to 18 milliseconds and water mist lasts for 30–50 milliseconds. By adjusting the process conditions reasonably, the maximum output frequency of the laser can reach 20Hz.
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2021, 
