反冲塞效应的热弹性理论分析（Ⅱ）──反鼓包运动

The Analytical Study on the Laser Induced Reverse-Pluggaing Effect by Using the Classical Elastic PlateTheory(Ⅱ)──Reversa-Bulge. Motion

本文对我们新近发现的长脉冲激光束对金属薄片材料的一种新的破坏方式──“反冲塞”效成（ＲＰＥ）的反鼓包运动进行了热弹性理论分忻．在不考虑膜力和弯矩相互耦合的小变形热弹性板理论情形下，将挠度ω分解为准静态部分ωｓ和动态部分ωｄ，得到了挠度ω的精确解．同时还分析了等效热载荷以及对早期运动状态进行了无量纲分析．这些分析能较好地定性解释反冲塞效应的早期运动状态即反鼓包运动特征．

The reverse-bulge motion (RBM) in the metallic foils, which is induced byspatially cylindrical long pulse laser, is examined in order to analyse the newly-discovered reverss plugging effect (RPE). An uncoupled, thin plate theory is usedto determine the induced flexcural vibrations. The solution is obtained as the superposition of two displacement fields, representing the quasi-static and the dynamic behayiors. Meanwhile, the equivalent thermal loading and the dimensionlessanalysis of thin plate motion are presented. Numerical results presented may partially explain the RBM of thin plate at the early stage of laser irradiation.