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为分析不同厚度的铝箔吸收层对激光在AZ31B镁合金薄板背面诱导的高应变率冲击波的影响,采用聚偏氟乙烯(PVDF)贴片传感器与数字示波器对强激光诱导的冲击波进行测量,利用测得的不同厚度吸收层下的压电波形,计算转换得到相应的冲击波压力波形。结果表明:铝箔吸收层厚度分别为100μm、200μm、300μm时,激光冲击波压力峰值随着吸收层厚度的增加而降低,冲击波第一个脉冲的脉宽随着吸收层厚度的增加而时间增长,即维持较高压力作用的时间增长;吸收层厚度为100μm时试样表面存在烧蚀损伤现象,吸收层厚度为300μm时,吸收层未完全气化,吸收层厚度为200μm时,冲击波作用的综合优势明显,吸收层过薄或过厚对冲击效果不利。
In order to analyze the influence of different thickness of aluminum foil absorption layer on the high strain rate shock wave induced by laser on the back of AZ31B magnesium alloy sheet, the strong laser induced shock wave was measured by PVDF chip sensor and digital oscilloscope. Obtained under different thickness piezoelectric layer under the absorption layer, calculated and converted to the corresponding shock wave pressure waveform. The results show that when the thickness of aluminum foil is 100μm, 200μm and 300μm respectively, the peak value of laser shock wave pressure decreases with the increase of absorption layer thickness. The pulse width of the first pulse of shock wave increases with the increase of absorption layer thickness The time of maintaining higher pressure is increased. Ablative damage exists on the surface of the sample when the thickness of the absorber layer is 100μm. When the absorber layer thickness is 300μm, the absorber layer is not fully vaporized and the thickness of the absorber layer is 200μm. Obviously, the absorbent layer is too thin or too thick on the adverse impact.