The effects of adhesive-backed overlays, specifically vinyl tape and aluminum tape, on the peak pressures generated by laser shock peening (LSP) of 7085 aluminum alloy and Ti-6Al-4V were investigated and the results are reported. Peak pressures were determined from photon doppler velocimetry measurements of rear surface velocity. Incorporating adhesive-backed opaque overlays in LSP provided up to 50 % pressure enhancement compared to processing without the overlays. Contrary to processing without the overlays, the temporal characteristics of LSP impulses with adhesive-backed overlays are shown to be independent of the laser pulse width in the range studied. This finding is an important impulse consideration in LSP parameter selection and has not been investigated or reported in the literature. A novel physics-based analytical model to predict shockwave pressures is proposed and validated with experimental data agreeing nominally within 15 % of the predicted values across the parameter space. The results provide insight into the improved residual stresses and enhanced material properties of published opaque overlay studies. Moreover, the results provide vital information for selecting LSP parameters for optimizing component performance and potential extension into previously unreachable pressure regimes.

研究了背胶覆盖层（特别是乙烯基胶带和铝胶带）对 7085 铝合金和 Ti-6Al-4V 激光冲击喷丸 (LSP) 产生的峰值压力的影响，并报告了结果。从后表面速度的光子多普勒测速测量确定峰值压力。与没有覆盖层的处理相比，在 LSP 中加入背胶不透明覆盖层可提供高达 50% 的压力增强。与没有覆盖层的处理相反，具有背胶覆盖层的 LSP 脉冲的时间特性与研究范围内的激光脉冲宽度无关。这一发现是 LSP 参数选择中的一个重要的脉冲考虑因素，在文献中尚未进行调查或报道。提出了一种新的基于物理学的分析模型来预测冲击波压力，并通过实验数据进行了验证，该模型在整个参数空间中名义上与预测值的 15% 之内一致。结果提供了对已发表的不透明覆盖层研究改进的残余应力和增强的材料特性的深入了解。此外，结果为选择 LSP 参数以优化组件性能和潜在扩展到以前无法达到的压力范围提供了重要信息。