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用纵向振动法测量弹性模量的实验装置
引用本文:路峻岭,汪荣宝,郑鹤松,晏思贤.用纵向振动法测量弹性模量的实验装置[J].物理实验,2005,25(11):22-25.
作者姓名:路峻岭  汪荣宝  郑鹤松  晏思贤
作者单位:1. 清华大学,物理系,北京,100084
2. 河海大学,理学院,江苏,南京,210013
摘    要:把待测样品制备成细长棒,受到一定拉力时细长棒有一定伸长,这可等效为弹簧,通过测量由细长棒与质量块构成的振子的固有频率可准确测量劲度系数,若测得了其劲度系数即可得该材料的弹性模量.基于以上思路设计了纵向振动法测量弹性模量的实验装置,使弹性模量测量实验既保留了光杠杆法物理概念清晰的优点,又吸取了振动法的长处.

关 键 词:弹性模量  固有频率  受迫振动  传感器
文章编号:1005-4642(2005)11-0022-04
收稿时间:2004-12-10
修稿时间:2005-02-24

Experiment to measure modulus of elasticity using longitudinal vibration
LU Jun-ling,WANG Rong-bao,ZHENG He-song,YAN Si-xian.Experiment to measure modulus of elasticity using longitudinal vibration[J].Physics Experimentation,2005,25(11):22-25.
Authors:LU Jun-ling  WANG Rong-bao  ZHENG He-song  YAN Si-xian
Institution:1. Department of Physics, Tsinghua University, Beijing 100084, China; 2. College of Science, Hohai University, Nanjing 210013, China
Abstract:The slender stick made from the sample to be measured will be elongate as it feels tensions.Thus,the stick can be regarded as a spring effectively.The modulus of elasticity of a kind of material can be known as one gets the coefficient of stiffness.And the coefficient of stiffness can be measured precisely as one measured the natural frequency of one oscillator composing the slender stick and an object.The experiment to measure modulus of elasticity using longitudinal vibration is designed, which not only keeps the distinct physical concepts of optical levers,but also utilizes the advantages of vibration.
Keywords:modulus of elasticity  natural frequency  forced vibration  sensor
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