Accurate Young’s modulus measurement based on Rayleigh wave velocity and empirical Poisson’s ratio

Abstract

This paper presents a method for Young's modulus measurement based on Rayleigh wave speed. The error in Poisson's ratio has weak influence on the measurement of Young's modulus based on Rayleigh wave speed, and Poisson's ratio minimally varies in a certain material; thus, we can accurately estimate Young's modulus with surface wave speed and a rough Poisson's ratio. We numerically analysed three methods using Rayleigh, longitudinal, and transversal wave speed, respectively, and the error in Poisson's ratio shows the least influence on the result in the method involving Rayleigh wave speed. An experiment was performed and has proved the feasibility of this method. Device for speed measuring could be small, and no sample pretreatment is needed. Hence, developing a portable instrument based on this method is possible. This method makes a good compromise between usability and precision.

Scanning acoustic microscopy investigation of weld lines in injection-molded parts manufactured from industrial thermoplastic polymer

“…V R corresponding to V ( z ) curves generated for the flat area 3.5 mm to the left of the weld line have an average value of 1624 ± 29 m/s. V R is related to the velocity of the shear and compressional waves propagating in isotropic samples for the same Possion’s ratio ( Briggs, 1992 ; Li and Feng, 2016 ). Therefore slower V R in regions closer to the weld lines indicate lower compression and shear moduli and consequently lower Young’s modulus than regions located within further distances ( Ahmed Mohamed et al, 2018 ).…”

Monitoring of Engineered Stones Used in Artwork Reproductions: Mechanical Characterization by Laser Vibrometry

“…As we were interested in the development of a nondestructive evaluation method based on the measurement of the Rayleigh wave, a comparison of the Rayleigh wave velocity and Young's modulus could define an experimental calibration curve of healthy samples. The accurate Young's modulus measurement based on Rayleigh wave velocity using an empirical Poisson's ratio may also be possible, as described by Li and Feng [27]. In the case of orthotropic material characterization, other techniques using full wavefield data may require the use of 3D scanning laser Doppler vibrometry and improved machine learning methods for the identification of properties such as elastic stiffness [21,22].…”

Scanning Acoustic Microscopy Comparison of Descemet's Membrane Normal Tissue and Tissue With Fuchs' Endothelial Dystrophy

“…The velocity of Rayleigh surface acoustic waves is related to the velocity of the shear (V s ) and compressional waves (V l ) propagating in isotropic samples, for the same Possion's ratio as 29,30 :…”