著者

矢野 浩之 椋代 純輔 大西 一広

出版者

社団法人日本材料学会

雑誌

材料 (ISSN:05145163)

巻号頁・発行日

vol.39, no.444, pp.1207-1212, 1990-09-15

被引用文献数

3 8

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The top plate of guitar is usually ismade from two wood species which belong to different genus,that is german spruce (picea abies) and western redceder (Thuja plicata). To clarify the characteristics of these species and of the wood materals for the top plat were measaured by means of free-free flexural vibretion method.The resulta were compared with the evaluation by ezpert of guitar mannufacture.The mean zalues of sapecific dynamic Young's modulus(Ε/γ)and tan δof german spruce were higher than those of western redceder,whileamong various wood species these twe had higher Ε/γand lower tan δ in the longitudinal direstion.These characteristics were particularly pronounced in the specimens which were judged by the ezpert to be high grade.Moreover,the standard deviation of the acouatia properties of the high grade sapecimens were smaller than of the medium or low grade ones regardless of the species. The value of Ε/γin the longitudinal direction,which can be obtained easily,seemed to be a convenient criterion for selecting the wood material suitable for guitar top plate.Because it correlated highly with tan δ in the longitudinal direction,and also with the ratio of tan δ in the radial direction was more appropriate,because the experimental values of Ε/γ and tan δ in any grain angle agreed with the values calaulated based on Hankinson's equation.