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■■■■■■■■■■■■■■■■■■■ 川崎製鉄技報 KAWASAKI STEEL GIHO Vol.11 (1979) No.1 ■■■■■■■■■■■■■■■■■■■ |
| 捩り振子による内部摩擦測定の理論と実験における二，三の寄与 Contributions to the Theory and Experiment of Internal Friction Measurement with Torsion Pendulums 岩崎 義光(Yoshimitu Iwasaki) 藤元 克已(Katsumi Fujimoto) 今中 拓一(Takuichi Imanaka) |
| 要旨 : 筆者らが最近展開した捩り振子に関する一連の理論と実験から，既存概念の問題点を指摘し，捩り内部摩擦の新たな概念を提唱した。理論で導いた内部摩擦，振動数に関する式を二,三の具体例で検証し，複合振子における吊線の効果を明らかにした。複合振子の力学的解析上陥りやすい過ちをCollette, Swartzの誤りをもとに解説し，捩り振子から得られる試料の内部摩擦の意味を明確した。内部摩擦の鉄鋼物性研究の応力に触れ，将来，捩り振子を用いた高温内部摩擦測定の重要性が増すことを説いた。 |
| Synopsis : Recently developed fundamental concepts are presented in the theory and experiment of torsion pendulums. General expressions of the internal friction are derived from the equation of motion associated with the torsion pendulum oscillating in free decay. The internal friction and frequency of the specimen are represented in the form containing explicitly those of the torsion wires. The formulae for these anelastic quantities enable one to estimate the effect of tha suspension in the torsion pendulums of the inverted, Collette and newly introduced three-component types. An experimental study has been made to ensure applicability of the formulae and examine inevitability of the correction of the suspension. Drawbacks are found in the current theory of the Collette and the inverted torsion pendulums. Detailed explanation of the drawbacks unveiled the meaning of anelasticity in the Collette pedulum, yielding fundamentals in the mechanical theory of the torsion pendulum. |
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