Measurement of Surface SH-Wave Velocities Generated on the Surface of Japanese Cypress Column

Masumi Hasegawa^*, Junji Matsumura

Department of Agro-Environmental Science, Faculty of Agriculture, Kyushu University, Fukuoka, Japan.

DOI: 10.4236/oja.2014.44018                

Abstract

Polyetherimide resin wedge transducers were used to generate a shear wave that was obliquely incident relative to the surface of a Japanese cypress column for measuring the surface SH-wave velocity. As the inter-transducer distance increased, the propagation time increased and the am-plitude became smaller. The propagation time and the amplitude were significantly correlated with the inter-transducer distance. The SH-wave velocity ranged from 1270 m/s to 1496 m/s. Surface SH-wave velocity was lower in the central part of the column and higher in the outer part. Velocity was negatively correlated with moisture content at 1% of significance level. These results suggest the accomplishment of the first target for applying the surface SH-wave acoustoelastic technique to nondestructive evaluation of drying stress in wood.

Keywords

Surface SH-Wave, Moisture Content, Acoustoelasticity, Velocity, Wood

Conflicts of Interest

The authors declare no conflicts of interest.

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