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以激光超声的热弹激发机理为基础,采用有限元技术求解热传导和热弹体运动的流-固耦合问题,得到了脉冲激光线源激励下气-铝界面上的瞬态泄漏Lamb波波形.在实验上,建立了基于光偏转原理的泄漏Lamb波探测装置,探测了脉冲激光在气-铝界面上激励泄漏Lamb波的实验波形.以数值计算和实验数据为基础,通过波形的相位谱和振幅谱分析了泄漏Lamb波的色散特性和衰减特性.
Based on the thermo-elastic excitation mechanism of laser ultrasonic, finite element method was used to solve the fluid-solid coupling problem of thermal conduction and thermal projectile motion. The waveform of transient leaked Lamb wave was obtained at gas-aluminum interface excited by pulsed laser source. In experiments, a leaky Lamb wave detection device based on the principle of light deflection was set up to detect the experimental waveforms of pulsed laser exciting Lamb wave leaked on the gas-aluminum interface.According to the numerical calculation and experimental data, The amplitude spectrum analyzes the dispersion and attenuation characteristics of the leaked Lamb wave.