激光冲击690高强钢表面残余应力工艺优化模拟
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摘要
为研究激光冲击对690高强钢表面残余应力尤其是"残余应力洞"的影响,在ANSYS/LSDYNA平台对690高强钢薄板经激光冲击后的残余应力进行模拟,优化光斑搭接率及激光功率密度。结果表明:采用搭接处理工艺,功率密度为1.98 GW/cm~2,在搭接率为33%、50%、66%时,激光冲击690高强钢表面最大残余压应力和光斑中心最小残余应力差值分别为275.6、241.6、238.3 MPa;搭接率的增加抑制了"残余应力洞";功率密度为2.77 GW/cm~2时,激光冲击表面残余应力优化结果最佳,达到211.0 MPa。
In order to study the effect of laser shocking on the surface residual stress of 690 high strength steel,especially the"residual stress hole",the residual stress of 690 high strength steel sheet after laser shocking was simulated on ANSYS/LSDYNA platform to optimize the spot overlapping rate and laser power density.The results show that the maximum residual compressive stress on the surface of 690 high strength steel and the minimum residual stress difference at the center of the laser spot are 275.6,241.6 and 238.3 MPa,respectively,when the overlapping rate is 33%,50%and 66%,respectively,under 1.98 GW/cm~2power density.With overlapping rate increasing the"residual stress hole"phenomenon is restrain.When the power density is 2.77 GW/cm~2,the best residual stress optimization of laser shock on the surface reach 211.0 MPa.
In order to study the effect of laser shocking on the surface residual stress of 690 high strength steel,especially the"residual stress hole",the residual stress of 690 high strength steel sheet after laser shocking was simulated on ANSYS/LSDYNA platform to optimize the spot overlapping rate and laser power density.The results show that the maximum residual compressive stress on the surface of 690 high strength steel and the minimum residual stress difference at the center of the laser spot are 275.6,241.6 and 238.3 MPa,respectively,when the overlapping rate is 33%,50%and 66%,respectively,under 1.98 GW/cm~2power density.With overlapping rate increasing the"residual stress hole"phenomenon is restrain.When the power density is 2.77 GW/cm~2,the best residual stress optimization of laser shock on the surface reach 211.0 MPa.
引文
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[7] Johnson G R,Cook W H. A constitutive model and data for metals subjected to large strains,high strain rates and high temperatures[C]//Proceedings of the 7th International Symposium on Ballistics. the Hague,Netherlands International Ballistics Committee,1983:541-547.
[8]Peyre P,Fabbro R. Laser shock processing:a review of the physics and applications[J]. Optical and Quantum Electronics,1995,27(12):1213-1229.
[9] Hong X,Wang S,Guo D,et al. Confining medium and absorptive overlay[J]. Optics and Lasers in Engineering,1998,29(6):