激光诱导冲击波在胶层中的传播耦合规律分析

Analysis of the propagation coupling law of laser-induced shock wave in the rubber layer

本文设计了高能激光诱导等离子体诱导激光冲击波冲击胶接试件试验,建立了激光冲击胶接试件的数值模型,模拟了应力波在胶层中的传播过程,对比试验与仿真所得到的背面粒子速度,验证了有限元模型的准确性。在此基础上,采用仿真方法研究了不同能量、脉冲宽度的激光冲击试件时,应力波在胶层中的传播耦合规律。结果表明,激光能量和脉宽均会影响应力波在胶层中的传播。随激光能量增大,试件背面自由粒子速度峰值和最大拉应力值增大,最大拉应力深度不变。随激光脉宽增大,试件背面自由粒子速度峰值增大,最大拉应力值增大,最大拉应力深度减小。

The study of the propagation and coupling law of laser-induced shock wave in laminated materials is the basis of the realization of this technology.In this paper,a high energy laser-induced plasma shock wave impact bonded specimen was designed,and a numerical model of the laser impact test specimen was established.The coupling process of stress wave propagation in the adhesive layer was simulated,and the particle velocity on the back obtained by the test and simulation was compared to verify the finite element model.On this basis,the simulation method is used to explore the stress wave propagation coupling law in the bond layer when the laser impact bonded specimen with different energy,pulse width and spot diameter.The results show that the laser energy and pulse width both affect the stress wave propagation in the rubber layer.With the increase of laser energy,the peak free particle velocity on the back of the specimen and maximum tensile stress value increase,and the maximum tensile stress depth remains unchanged.With the increase of laser pulse width,the peak free particle velocity on the back of the specimen increases,the maximum tensile stress value increases,and the maximum tensile stress depth decreases.