Finite Element Analysis And Experimental Studies Of Sheet Deformation In Laser Shock Processing

Laser shock peening formation as a kind of advanced manufacturing technology,with the technology characteristics and the advantage,it is widely concerned in the field of peening formation of the sheet metal. The forming mechanism of peening formation is that plasma induced by high energy laser beam shock wave pressure causes the material to produce plastic deformation in order to obtain a certain curvature deformation of sheet metal. Optimization and adjustment the parameter of laser shock peening formation is the key to achieve accurate forming. Plastic deformation behavior of the material on laser shock peening plate are analyzed by finite element numerical simulation and experimental verification,the main research contents include:First introduces the formation conditions and the characteristics of laser,then start with the basic principle of pressure induced plasma shock wave,discussed the dynamic response under loading of laser shock wave pressure and influence of process parameters of bending deformation of laser shock peening.According to the main characteristics of sheet metal forming by laser shock peening, established a three-dimensional finite element model of laser shock peening formation based on analysis platform of ANSYS/LS-DYNA finite element analysis software, analyze the laser shock peening process by finite element analysis, the main study is the influence of the technological parameter of laser shock peening formation(laser shock pressure, time duration) on law of bending deformation on the sheet, obtained the basic law of sheet forming by laser shock peening under the different parameters, optimize and control parameters of laser shock peening.Used 70 steel as the experimental object, made sheet metal of laser shock peening formation experimental study under the constraint state. Research shows that, with the increased of the shock impact pressure and time duration, the bending deformation is bigger. Based on the simulation, using Almen gauge to measuring bending deformation of materials after experimental verification, results from experimental data and numerical simulation are similar, through the finite element method could achieve the bending deformation within a certain precision.Provides significant guidance for the research results for optimal control of process parameters in sheet forming by laser shock peening.