著者

深田 栄一 安田 栄夫 小原 二郎 岡本 一

出版者

The Japan Society of Applied Physics

雑誌

応用物理 (ISSN:03698009)

巻号頁・発行日

vol.26, no.1, pp.25-28, 1957

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The dynamic Young's modulus and the piezoelectric constant of old timbers have been measured. They increase with time during the first about 300 years, then decrease gradually. The relation between the modulus and the constant is linear, indicating that both depend on the crystalline region content of cellulose fibers. The changes of the modulus and the constant with time can be explained by the crystallization and the heat dissociation of cellulose molecules that go on for long years.