方形光斑激光冲击690高强钢表面残余应力分布模拟

Simulation of residual stress distribution on square spot laser shocked surface of 690 high strength steel

为研究方形光斑激光冲击690高强钢表面残余应力的分布,在ANSYS/LSDYNA平台进行了二元光学衍射方形光斑激光冲击690高强钢薄板的残余应力分布模拟,并对其不同光斑搭接率处理工艺研究,得出了几种工艺下激光冲击690高强钢表面残余应力分布的云图和二元衍射光斑转换前后的残余应力分布曲线。结果表明,采用二元衍射光斑工艺进行激光冲击对于消除残余应力洞有较好效果;在33%、50%、66%这3种典型的搭接率下,二元光学衍射光斑周围区域残余应力分布比较均匀,且不同搭接率下的最大残余压应力和光斑中心最小残余压应力均相互接近,所以二元衍射光斑激光冲击690高强钢无需搭接处理。

In order to study the distribution of the residual stress of 690 high-strength steel after the square spot laser shocking,the simulation of the residual stress distribution of the 690 high-strength steel sheet after the binary diffraction spot laser shock was carried out based on the platform of ANSYS/LSDYNA. The processing of different spot overlap rate was also studied. The nephogram of residual stress distribution on the surface of 690 high-strength steel after laser shock processing and the residual stress distribution curve before and after the conversion of the binary diffraction spot were obtained. The results show that laser shock using binary diffractive spot process has good effect on eliminating residual stress holes. In the 33%,50%,and 66% of the three typical overlap rates,the residual stress distribution around the binary optical diffraction spot is more uniform; The maximum residual compressive stress and the spot center minimum residual compressive stress under different overlap rates are all close to each other,so the spot overlap is not necessary for the binary diffraction spot laser shock.