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介绍了激光冲击板料变形的机理和冲击波产生的原因,提出了激光冲击板料变形中激光-能量转换体-靶材系统的爆轰波压力估算式。根据此压力估算式和材料的动态屈服强度,对激光冲击板料变形中所需的最小激光能量进行了估算,板料厚度为0.5 mm,约束凹模孔径Φ20 mm,在光斑直径6 mm,脉宽25 ns条件下的不锈钢靶材变形所需的最低脉冲能量大约为11 J。实验结果表明估算的最小激光能量与板料变形所需的能量阈值基本一致,且板料变形量随激光能量的增加呈非线性增大。最小激光能量的估算以及能量与板料变形的实验研究为板料变形的精确控制和预测提供了理论依据。
The mechanism of laser shock plate deformation and the cause of shock wave are introduced. The formula of detonation pressure of laser - energy converter - target system during laser shock plate deformation is proposed. Based on this pressure estimation formula and the dynamic yield strength of the material, the minimum laser energy required for the laser shock plate deformation was estimated. The plate thickness was 0.5 mm, the diameter of the constraining die was Φ20 mm, the diameter of the spot was 6 mm, The minimum pulse energy required to deform a stainless steel target at 25 ns wide is about 11J. The experimental results show that the estimated minimum laser energy is basically the same as the energy threshold required for sheet deformation, and the sheet deformation increases nonlinearly with the increase of laser energy. The estimation of the minimum laser energy and the experimental study of energy and sheet deformation provide the theoretical basis for the accurate control and prediction of sheet deformation.