Measurement of Strain-Amplitude Dependent Internal Friction with Torsion Pendulum and Vibration Reed Methods

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(Institution)
Abstract
701-002
Qianfeng Fang Fang, Q.(Institute of Solid State Physics, Chinese Academy of Sciences); Wang, H.(National key laboratory for nuclear fuel and materials, Nuclear Power Institute of China); Wang, X.(Institute of Solid State Physics, Chinese Academy of Sciences); Wang, L.(National key laboratory for nuclear fuel and materials, Nuclear Power Institute of China); Zhuang, Z.(Institute of Solid State Physics, Chinese Academy of Sciences); In the traditional standard of internal friction measurement the torsion pendulum and vibration reed were preferentially recommended and the issue of strain amplitude dependence of internal friction was not concerned. To more precisely measure materials’ internal friction and modulus at various train amplitude, in this paper the strain amplitude dependence of internal friction and modulus is considered by analyzing the stress distribution in the sample in different internal friction measurement methods. The formulas for the measurement of internal friction and modulus versus strain-amplitude are obtained by re-deriving the principle equations for internal friction and modulus measurements by torsion pendulum and vibration reed methods from the basic definition of internal friction. This provides a new standard for precise measurement of internal friction at different strain-amplitude in the cases of high strain-amplitude excitation or high damping materials.
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