中文摘要：

为研究激光冲击波在690高强钢薄板中的传播机制，对690高强钢薄板经激光冲击后的动态响应以Hyperworks、LSDYNA为平台进行模拟，用聚偏氟乙烯压电传感器进行测量，将模拟结果与实验结果对比研究试样动态应变特性，建立了高应变率条件下表面动态应变模型和690高强钢薄板激光冲击波加载模型。研究结果表明，在功率密度为12．7GW／cm2的激光加载下，通过改变表面测量位置和试样厚度测得表面Rayleigh波波速为3．08×103m／s、纵波的波速为3．09×103m／s；表面Rayleigh波传播速度模拟值为3．24×103m／s，模拟结果与实验结果有较好的一致性；通过调整激光功率密度可分离剪切波和表面Raylelgh波。实验数据证明690高强钢表面动态应变模型准确可靠，激光冲击波加载模型可描述激光冲击波在690高强钢薄板中的传播机制。

英文摘要：

To study the transmission mechanism of laser shock wave inside the 690 high-strength steel sheet, the dynamic strain induced by laser shock loaded on 690 high-strength steel sheet was simulated on the platforms of Hyperworks and LSDYNA. The experimental results were measured by a polyoinglidene fluoride piezo electric sensor. A comparison between the simulated and the experimental results was carried out. The dynamic strain model of 690 high-strength steel surface under high strain rate of pulsed laser shock and a loading model under the laser shock waves on 690 high-strength steel sheet were established. The results show that under the loading power density of 12.7 GW/cm2 through changing the location of measuring position and thickness of the samples, the measured velocity of Rayleigh wave and laser shock is 3.08 X 10a m/s and 3.09 X 10a m/s respectively. The simulated value of the velocity of the surface Rayleigh wave was 3.24 X 10a m/s, displaying significant consistency with the experimental results. Shear wave and Rayleigh wave can be separated through adjusting the power density of laser shock. The experimental results demonstrate the accuracy and reliability of the dynamic strain model of 690 high-strength steel surface loaded by the pulsed laser shock wave, The loading model of the laser shock waves can be used to describe the transmission mechanism of the laser shock wave inside the 690 high-strength steel sheet.