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

作　　者：Masumi Hasegawa Junji Matsumura 

机构地区：[1]Department of Agro-Environmental Science, Faculty of Agriculture, Kyushu University, Fukuoka, Japan

出　　处：《Open Journal of Acoustics》2014年第4期177-183,共7页声学期刊（英文）

摘　　要：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.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.

关 键 词：SURFACE SH-Wave MOISTURE Content ACOUSTOELASTICITY Velocity Wood 

分 类 号：R73[医药卫生—肿瘤]