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

• 作者: Junji Matsumura Masumi Hasegawa
• 来源期刊: 声学期刊(英文)
• 学科: 医学
• 关键词: SURFACE SH-Wave Moisture Content ACOUSTOELASTICITY Velocity Wood
• 年，卷（期）: 2014,（4）
• 页码范围: 177-183
• 页数: 7页
• 分类号: R73

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.