Localized indentation and its relationship with overall deformation of thin metal sheets induced by laser peen forming
Author: Ruoyu Yang and Yongxiang Hu* State Key Laboratory of Mechanical System and Vibration, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, China
Source: ICSP14 Milan
Doc ID: 2022083
Year of Publication: 2022
Abstract:
Abstract
Laser peen forming (LPF) is a non-contact incremental forming method that introduces plastic
deformation by laser shocks to modify the curvature of components. This study focuses on
the localized indentation profiles of thin metal sheets induced by a single shock, and explores
their relationship with overall plastic deformation after multiple shocks. LPF experiments with
different spot sizes and laser power densities are conducted on thin metal sheets with a
thickness of 0.5 mm. Two types of indentation profiles are produced, which are crater and
conical profiles, after LPF with spot sizes of 0.8 mm and 4.0 mm. It is found that the indentation
profile type remains the same except for the depth value after LPF with different power
densities. Then, overall deformation behaviors are also investigated with different process
parameters. Downward and upward deformation directions are generated after LPF with two
spot sizes, respectively. Two deformation directions are also unchanged via adjusting laser
power densities only. The overall deformation behavior is found to have a close relationship
with the localized indentation profile. Therefore, an effective method is proposed to predict the
overall deformation direction by localized indentation after a single shock.
Keywords: Laser peen forming, thin metal sheet, indentation profile, overall deformation.
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