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.
Highlights
Wood contains significant amount of water after cutting
Few studies have reported the relationship between shear wave velocity and moisture content. Both dependences were experimentally confirmed for the first time. These results suggest that the moisture content effect has to be considered for applying surface SH-wave acoustoelastic technique to drying stress measurement in wood
A surface SH-wave was generated on the surface of a Japanese cypress column, and its velocity distribution was measured
Summary
Wood contains significant amount of water after cutting. Prior to it being used as a timber material, it is necessary to dry the wood to obtain an adequate water content as required by timber manufacturers. The wood water content affects its drying characteristics [1]. A water content gradient is generated due to the difference between the bulk and surface drying rates. This water content gradient generates drying stress, manifested as checks that appear on the wood surface. The checks depreciate the lumber’s ornamental value. In Japan, a trend has emerged to use decorative wood as structure wood.
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