铝合金激光冲击强化的三维数值模拟

李博民; 刘新民; 张晖辉; 刘峰

doi:doi:10.14128/j.cnki.al.20173705.852

应用激光, 2017, 37 (6): 852, 网络出版: 2018-01-10

铝合金激光冲击强化的三维数值模拟

Numerical Simulation of Laser Shock Processing in 2024 Aluminum Alloy

论文大纲

李博民 ^*刘新民张晖辉刘峰

作者单位

燕山大学河北省重型装备与大型结构力学可靠性重点实验室, 河北秦皇岛 066004

激光表面处理有限元残余应力 laser surface treatment finite element residual stress

摘要

应用ABAQUS软件对激光冲击处理2024铝合金的残余应力场进行三维有限元数值模拟。详细讨论了激光功率密度、光斑尺寸、脉冲宽度(脉宽)以及冲击次数等参数对残余应力场的影响规律。计算结果表明, 光斑中心位置的残余压应力值随着激光功率密度的增大出现先增大后减小的趋势, 在激光功率密度6.19 GW/cm2 时其值最大; 光斑半径的增加主要对残余压应力层深度影响较大; 表面残余压应力最大值随着脉宽的增加而增加; 冲击次数在一定阈值范围内, 光斑中心的残余压应力增幅明显, 之后逐渐趋于饱和。在一定参数范围内, 残余压应力层深度随脉宽和冲击次数的增加而增大。

Abstract

The three-dimensional finite element simulation is applied to analyse the residual stress field of 2024 aluminum alloy induced by laser shock processing (LSP) by using the ABAQUS software. The influence law of laser parameters including laser power density, laser spot size, full width at half maximum (FWHM) and shock times on residual stress field are systematically analyzed. The calculation results show that with the increase of laser power density, the residual compressive stress at the center of the beam increases first and then decreases, and the maximum value at the laser power density is 6.19 GW/cm2. The increase of the spot radius has a great influence on the depth of the residual compressive stress layer. To some extent, the maximum value of residual compressive stress increases with the increase of FWHM. The residual compressive stress at the spot center increases significantly under certain impact times and gradually reaches saturation. Within some range of parameters, the depth of residual compressive layer increases with the increase of FWHM and impact times.

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李博民, 刘新民, 张晖辉, 刘峰. 铝合金激光冲击强化的三维数值模拟[J]. 应用激光, 2017, 37(6): 852. Li Bomin, Liu Xinmin, Zhang Huihui, Liu Feng. Numerical Simulation of Laser Shock Processing in 2024 Aluminum Alloy[J]. APPLIED LASER, 2017, 37(6): 852.

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