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100 μm、200 μm、300 μm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100 μm时试样表面存在烧蚀损伤现象,吸收层厚度为300 μm时,吸收层未完全气化,吸收层厚度为200 μm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 effect of different thickness of aluminum foil absorbing layer on the high strain rate shock wave induced by laser on the back surface of AZ31B magnesium alloy sheet,the shockwaves induced by high intensity laser were measured by a poly (ethylene fluoride) (PVDF) patch sensor and a digital oscilloscope.Then the corresponding pressure waveforms was calculated by using the measured wave of the different thickness of the absorption layer.The results indicate that when the thickness of the absorbing layer is 100 μm,200 μm,300 μm respectively,the peak pressure of the shockwave decreases and the first shockwave pulse width increases with increasing of the absorbing layer thickness,which means the high pressure time keeps longer,the specimen surface has ablation damage when the absorbing layer thickness is 100 μm;and when the absorbing layer thickness is 300 μm,it is not completely gasified.The comprehensive advantage of shock wave is obvious when the absorbing layer thickness is 200 μm.Both of too thin or too thick of absorbing layers have opposite effects to shock wave.
参考文献
| [1] | A. Kouadri;L. Barrallier.Texture characterisation of hexagonal metals: Magnesium AZ91 alloy, welded by laser processing[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,20061/2(1/2):11-17. |
| [2] | 张凌峰;张永康;任旭东;冯爱新.激光冲击约束层和吸收层的研究[J].农业机械学报,2007(1):127-131. |
| [3] | 鲁金忠 .激光冲击强化铝合金力学性能及微观塑性变形机理研究[D].江苏大学,2010. |
| [4] | 冯爱新;施芬;韩振春;薛伟;李彬;杨润;卢轶.激光诱导2024铝合金表面动态应变检测[J].强激光与粒子束,2013(4):872-874. |
| [5] | 曹宇鹏;冯爱新;薛伟;花国然.激光冲击波诱导2024铝合金表面动态应变特性试验研究及理论分析[J].中国激光,2014(9):90-95. |
| [6] | 洪昕.强激光驱动高压冲击波特性研究[J].中国激光,1998(08):743. |
| [7] | 王声波;范勇;吴鸿兴;郭大浩;戴宇生;夏小平.约束结构下激光冲击波特性实验研究[J].强激光与粒子束,2004(8):981-984. |
| [8] | 朱文辉;李志勇;周光泉;刘朝晖.约束靶面黑漆涂层对激光冲击波的影响[J].强激光与粒子束,1997(03):458. |
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