Bayón Ana, Gascón Francisco, Nieves Francisco J
Departamento de Física Aplicada a los Recursos Naturales, Universidad Politécnica de Madrid, E.T.S. Ingenieros de Minas, C./Ríos Rosas, 21, 28003 Madrid, Spain.
J Acoust Soc Am. 2005 Jun;117(6):3469-77. doi: 10.1121/1.1898663.
In this paper a method is proposed to characterize the elasticity of isotropic linear materials from the generation and detection of an acoustic surface wave. For the calculation of the elastic constants, it is sufficient that only one of the faces of the sample be accessible. The methodology is based on both the measurement of the Rayleigh wave velocity and on the determination of the normal to longitudinal amplitude ratio calculated from the normal and longitudinal components of the displacement of a point. The detection of two consecutive surface wave pulses using a single experimental setup permits the determination of the elastic constants. The method is applied to calculate Young's modulus and Poisson's ratio of an aluminum sample as well as their systematic uncertainties. The results obtained give a relative uncertainty for Young's modulus on the order of the sixth part of that calculated for Poisson's ratio.
本文提出了一种通过声表面波的产生和检测来表征各向同性线性材料弹性的方法。对于弹性常数的计算，只需样品的一个面是可触及的即可。该方法基于瑞利波速度的测量以及根据某一点位移的法向分量和纵向分量计算出的法向与纵向振幅比的确定。使用单一实验装置检测两个连续的表面波脉冲可以确定弹性常数。该方法被应用于计算铝样品的杨氏模量和泊松比以及它们的系统不确定度。所得结果给出的杨氏模量相对不确定度约为泊松比计算值的六分之一。
