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为了研究约束层和激光功率密度对激光冲击强化AZ31B镁合金所诱发的冲击波的影响,采用响应快、频响高的绝缘膜组合式高聚物压电传感器和数字示波器对强激光诱发的冲击波进行测量。利用测得的有约束层和无约束层时的压电波形,分别得到相应的冲击波压力波形并进行比较;同时将不同激光功率密度下得到的压电波形转化为冲击波压力波形并进行对比。研究结果表明,在有约束层的情况下冲击波峰值压力是无约束层时的8倍左右,且脉冲的持续时间也有显著提高;在约束层的绝缘击穿阈值范围内,随着入射激光功率密度的增加,冲击波的峰值压力也随之增大。
In order to study the effect of confinement layer and laser power density on the shock wave induced by laser shock-enhanced AZ31B magnesium alloy, the intense laser-induced shock wave was carried out by using a combination of piezoelectric film sensor and digital oscilloscope with fast response and high frequency response measuring. The corresponding shock wave pressure waveforms were obtained and compared by using the measured piezoelectric waveforms with constrained and unconstrained layers. At the same time, the piezoelectric waveforms obtained under different laser power densities were transformed into shock wave pressure waveforms and compared. The results show that the peak pressure of the shock wave is about 8 times of that of the unconfined layer and the duration of the pulse is also significantly improved in the case of the constrained layer. With the dielectric constant of the incident laser power density Increase, the peak pressure of shock wave also increases.