激光冲击强化2024-T3铝合金的数值模拟与试验.pdfVIP

2 0 0 7年l2月 农 业 机 械 学 报 第38卷第l2期 激光冲击强化2024一T3铝合金的数值模拟与试验* 张兴权 张永康 顾永玉 周建忠 【摘要】 表面冲击坑深度和残余应力大小是评价激光冲击强化效果的两个重要指标。采用数值模拟软件对激 光冲击强化2024一T3铝合金进行了数值模拟，对模拟过程中的关键技术问题进行了处理，建立了有限元分析模 型，并进行了试验验证。数值模拟的冲击坑深度和试验值相差为5．78％，模拟的表面残余压应力的最大值与试验所 得的数值偏差为2．7 。 关键词：激光冲击 数值模拟 冲击坑 表面残余应力 试验 中图分类号：TN249；TG665 文献标识码：A Numerical Simulation and Experimental InVestigati0n on Laser Shock Processing Zhang Xingquan Zhang Yongkang Gu Yongyu Zhou Jianzhong (1．Anhui University of Technology 2．Jiangsu University) Abstract The magnitude of residual stress and the depth of dent are two important factors to assess the effect of laser shocking．They were simulated by numerical analysis software．During the simulation，the key technology was solved and the mathematical model was established．The experiment was also carried out to test the results of simulation．The simulation results were well agreed with the experimental results．The deviation of the depth of dents between calculated results and experimental data is 5．78 ，and the magnitude of simulation of residual stresses is 2．7％，which indicated that the numerical simulation could play a directional role in optimizing parameters to improve effect of laser shock processing． Key words Laser shocking，Numerical simulation，Dent，Surface residual stress， Experiment 的残余应力梯度将引起工件的变形；在工件表面形 引言 成的冲击坑影响着工件表面的平整度和粗糙度，过 激光冲击强化能大大提高金属材料的强度、改 深的冲击坑引起的应力集中将抵消冲击强化引起的 善其耐磨性能和耐腐蚀性能，延长金属零件的疲劳 残余压应力值。因此选择激光脉冲的参数，来控制工 寿命【l ]，特别适合于受交变载荷作用的零件的强 件表面冲击坑的深度、残余压应力的大小，是激光冲 化。在激光冲击下，材料表面产生冲击坑、内部组织 击强化首要解决的问题。 得到细化和残余压应力产生。残余应力的