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中文核心期刊

激光热弹激励流-固泄漏Lamb波的有限元模拟

Finite element simulation of leaky lamb wave at fluid-solid interfaces excited thermoelastically by pulsed laser

  • 摘要: 根据变分原理,得到热弹体运动方程和热传导方程相对应的有限元方程. 通过数值积分方法求解有限元方程,得到脉冲激光线源在水/铝、空气/铝这两种流-固界面上热弹激励的泄漏Lamb波瞬态波形. 计算结果表明,泄漏Lamb波不但存在于液-固界面,而且存在于气-固界面;和Lamb波相反,泄漏Lamb波的S_0模态是反对称的,而A_0模态是对称的;但由于这两种流-固界面的性质差异导致泄漏Lamb波的波形和幅度不同.

     

    Abstract: Based on the variation principle, the corresponding finite element equationsfor the thermoelstic and heat conduction equations are obtained. The finiteelement equations for the fluid-solid interface waves propagated along thewater-aluminum, air-aluminum interfaces are solved by using the numericalmethod of integration, and then the transient waveforms excitedthermoelastically by a pulsed laser line source are obtained. The resultsshow that the leaky Lamb wave exists at the liquid-solid interface and alsoexists at air-solid interface; in reverse to the Lamb wave, the S_0 modeof leaky Lamb wave is antisymmetric, and the A_0 is symmetric; due tothe difference of the two kinds fluid-solid interfaces, the waveforms andamplitudes of the two leaky Lamb waves are different.

     

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