Finite Element Simulation Method of Laser Shock Hardening

Abstract

The invention discloses a finite element simulation method of laser shock peening. The finite element simulation method of laser shock peening comprises the following steps that a three-dimensional model is established in ABAQUS, material performance parameters are set, a Johnson-Cook constitutive equation is adopted, dynamic explicit analysis steps are set, the target material internal plasticity change is made to reach the maximum value in each analysis step, and meanwhile the kinetic energy tends to be zero finally; sub-program editing of laser shock time and position distribution of multiple light spots is conducted, and exertion of a load is achieved; mashing is conducted, wherein mesh refinement is conducted in a laser shock peening area; and analysis operation is established to conduct Explicit solving, and a residual stress field and displacement deformation distribution are obtained. The finite element simulation method of laser shock peening has the advantages of being rapid, low in cost, simple and easy and convenient to implement and accurate in calculation and has a good engineering application prospect. By the adoption of the finite element simulation method of laser shock peening, simulation of laser shock peening of the multiple light spots can be conveniently and rapidly conducted, and a reliable basis is provided for parameter optimization.

Description

technical field [0001] The invention relates to the technical field of laser shock strengthening, and more specifically, relates to a finite element simulation method of laser shock strengthening. Background technique [0002] Laser shock strengthening technology is a new type of material surface strengthening method, which is achieved through high power density (GW / cm 2 The laser beam with pulse width (ns level) passes through the transparent confinement layer and acts on the absorbing coating coated on the surface of the metal target. The coating material absorbs the laser energy and quickly vaporizes to form a high-temperature, high-pressure plasma. , the plasma is affected by the confinement layer to generate high-intensity shock waves on the metal surface. When the peak pressure of the shock wave exceeds the dynamic yield strength of the material, plastic strain occurs on the surface of the material. When the laser action ends, due to the reaction of the material in th...

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Problems solved by technology

[0005] In view of this, the first object of the present invention is to provide a finite element simulation method for laser shock strengthening, which can effectively solve the problem of difficult optimization of laser shock strengthening parameters for multiple spots

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