金属板料的激光冲击变形分析及其实验研究

介绍了激光冲击变形机理和冲击波产生原因,并建立了激光冲击下的板料变形模型,且推导了板料变形量计算公式。根据爆轰波和爆炸气体动力学理论,建立了激光冲击成形中激光-能量转换体-靶材系统爆轰波压力的估算式,并根据冲击波压力估算式估算所需激光脉冲能量,从而探讨了板料变形与激光能量、冲击波压力之间的关系,并进行实验研究。实验结果表明,板料厚度对变形量的影响与变形理论模型的分析基本相同,其变形量随厚度的增加而呈指数曲线减小,其轮廓形状也由小圆锥形逐渐向小球冠状变化。

Analysis and Experiment on Deformation of Sheet Metal by Laser Shock Wave

The mechanism of laser shock deformation and the reason of producing the shock wave are introduced.The deformation model for the sheet metal by the laser shock is established,and the calculation formula for its deformation magnitude is deduced.The evaluation formula of the detonation wave pressure in the system of laser,energy transfer medium and the metal target is built according to the detonation wave and the explosive gas dynamical theory.The energy of the laser pulse is evaluated based on the formula of the laser shock pressure.And relationships among the sheet metal deformation,the laser energy and the shock wave pressure are discussed.Experimental results show that the effects of the thickness of sheet metal on the deformation magnitude are similar to the theory model for deformation.Its deformation magnitude decreases in the index curve with the increasing thickness,and its outline is also gradually changed into the small ball coronal from the small cone.