• 大学生园地 •

两种不同方法测量材料剪切模量

1. 南京信息工程大学物理与光电工程学院，江苏南京210044
• 出版日期:2017-10-20 发布日期:2017-10-20
• 通讯作者: 张雅男，Email:phyzyn@ nuist. edu.cn
• 作者简介:夏雨晴( 1996—) ，女，黑龙江哈尔滨人，南京信息工程大学物理与光电工程学院2014 级应用物理专业本科生.

Two different methods to measure the material shear modulus

XIA Yu-qing，YE Chen-yu，WANG Yan-zhao，ZHANG Ya-nan

1. School of Physics and Optoelectronics Engineering，Nanjing University of Information Science and Technology，Nanjing，Jiangsu 210044，China
• Online:2017-10-20 Published:2017-10-20

Abstract: When a coil hanging under the copper wire，due to the torque of the copper wire for harmonic vibration，simple harmonic vibration cycle can be calculated for the shear modulus of copper wire. After the coil is energized，it is affected by the geomagnetic moment in the earth s magnetic field. By using the optical lever amplification principle，the shear modulus of the copper wire can be calculated by measuring the small deflection angle before and after the coil is energized. In order to reduce the measurement time，the coil can be measured in a very short time by measuring the harmonic vibration image before and after the captured coil is energized，so as to measure the shear modulus of the copper wire. The method of kinematics，mechanics，optics，electromagnetism principle and image analysis technique is used to measure the shear modulus of the material，which improves the measurement accuracy，reduces the measurement cost and is easy to operate. It is very suitable for popularization in university physics teaching.