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激光冲击过程中,剩余吸收层对冲击效果影响显著,但其影响规律少有人关注。文中选择厚度、材质不同的材料作吸收层,实施激光冲击,控制激光参数,使得靶材表面留有剩余吸收层。通过表征靶材表面冲击区域凹坑尺寸、力学性能,以及直接检测冲击时靶材背面的冲击波信号,研究剩余吸收层对冲击效果的影响规律。结果表明:剩余吸收层会显著衰减冲击波,进而削弱靶材的冲击效果;对确定的约束层和靶材,存在具有“最佳声阻抗值”的理想吸收层,使得作用于靶材的冲击波强度最大;激光冲击时,为获得好的冲击效果,必须根据约束层、靶材等,选择合适吸收层,优化吸收层涂覆厚度。文中结果为激光冲击时吸收层材质和厚度的选择提供了依据。
During the laser shock process, the remaining absorption layer has a significant impact on the impact effect, but few people pay attention to its influence law. In this paper, the choice of the thickness, material of different materials for the absorber layer, the implementation of laser shocks, laser parameters control, making the target surface left over the absorber layer. The effects of the remaining absorption layer on the impact were investigated by characterizing the size of the dimples in the impact area of the target surface, the mechanical properties, and the direct detection of the shock wave signal at the back of the target during impact. The results show that the remaining absorption layer will significantly attenuate the shock wave and then weaken the impact of the target. For the constrained layer and the target, there is an ideal absorption layer with the best acoustic impedance value, Shock wave intensity maximum; laser shock, in order to obtain a good impact, according to constraints, targets, etc., select the appropriate absorption layer, the absorption layer to optimize the coating thickness. The results provide the basis for the choice of material and thickness of the absorber layer during laser shock.