作者：方前锋^1,3, 王辉², 王先平^1,3, 王理², 庄重^1,3

作者单位：1. 中国科学院固体物理研究所内耗与固体缺陷实验室, 安徽 合肥 230031;
2. 中国核动力研究设计院反应堆燃料与材料重点实验室, 四川 成都 610041;
3. 苏州丹平格仪器有限公司, 江苏 苏州 215000

关键词：内耗测量技术;葛氏摆;振簧法;内耗振幅效应

摘要：

传统的内耗测量规范多采用扭摆法和振簧法，并没有涉及内耗随应变振幅变化的情况。为更加准确测量材料在不同应变振幅下的内耗和模量值，该文根据不同内耗测量方法中试样的应力分布情况，从内耗基本定义出发，考虑内耗随应变振幅变化的情况，重新推演扭摆法和振簧法测量内耗和模量的基本方程，获得采用扭摆法和振簧法测量内耗（模量）-振幅曲线的修正公式，为准确测量大应变振幅激发情形下高阻尼材料的内耗和模量提供参考。

Modification formulas for strain-amplitude dependent internal friction measurement with torsion pendulum and vibration reed methods

FANG Qianfeng^1,3, WANG Hui², WANG Xianping^1,3, WANG Li², ZHUANG Zhong^1,3

1. Laboratory of Internal Friction & Defects in Solids, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China;
2. National Key Laboratory for Nuclear Fuel and Materials, Nuclear Power Institute of China, Chengdu 610041, China;
3. Suzhou Damping Instruments Company Limited, Suzhou 215000, China

Abstract: To 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 taken into consideration. To more precisely measure materials' internal friction and modulus at various strain amplitude, this paper considers the strain amplitude dependence of internal friction and modulus by analyzing the stress distribution in the sample in different internal friction measurement methods. The modification 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.

Keywords: technique of internal friction measurement;Ke's pendulum;vibration reed;amplitude dependence of internal friction

2017, 43(4): 1-5  收稿日期: 2016-06-20;收到修改稿日期: 2016-08-05

基金项目: 国家自然科学基金项目（11274305）

作者简介: 方前锋(1962-),男,研究员,博导,研究方向为特种金属材料。

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