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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/cm~2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3.08×103 m/s、纵波的波速为3.09×103 m/s;表面Rayleigh波传播速度模拟值为3.24×103 m/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Rayleigh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。
In order to study the propagation mechanism of laser shock wave in 690 high-strength steel sheet, the dynamic response of 690 high-strength steel sheet after laser shock was simulated by Hyperworks and LSDYNA. The results were compared with the results obtained by using PVDF piezoelectric sensor. The experimental results compare the dynamic strain characteristics of the samples, and establish the model of surface dynamic strain under high strain rate and the laser shock wave loading model of 690 high strength steel sheet. The results show that the surface Rayleigh wave velocity is 3.08 × 103 m / s and the longitudinal wave velocity is 3.09 × 103 m under the laser loading of the power density of 12.7GW / cm ~ 2 / s; Rayleigh wave propagation velocity simulation value is 3.24 × 103 m / s, the simulation results are in good agreement with the experimental results; shear wave and surface Rayleigh wave can be separated by adjusting the laser power density. The experimental data prove that the dynamic strain model of 690 high-strength steel is accurate and reliable, and the laser shock wave loading model can describe the propagation mechanism of laser shock wave in 690 high-strength steel sheet.