Numerical investigation of surface textural dimples of titanium alloy subjected to laser shock processing.

Laser shock processing is utilized to produce laser dimples by means of mechanical force, with local plastic deformation induced on the material surface. Based on this characteristic, array dimples are prepared to regularly distribute on the treated surface, to manufacture anti-friction surfaces fulfilling service requirements. In the current work, finite element method (FEM) served as an effective method for better understanding the deformation characteristics of the laser-shocked dimple under single-shot and overlapping shot laser shock processing and investigating the influence of laser parameters. The results indicate that the target material experienced unceasing deformation and dynamic elastic recovery during the dynamic response process. The ultimate dimple profile was significantly affected by diverse types of pressure spatial distribution. In addition, the pile-up appeared at the dimple edge, and the reverse deformation near the spot center was more prone to occur in the case of flap-top distribution, which also appeared in the overlapping laser shock. The experimental profiles of laser shock dimples were consistent with the simulation results in the overlapping laser shock, showing that the finite element simulation can be effectively used to design surface textural dimples. [ABSTRACT FROM AUTHOR]

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