【摘要】 本文介绍了利用千分表测量金属丝的杨氏模量的方法.该方法针对常见的拉伸法测量金属丝杨氏模量的不足,提出用千分表取代光杠杆装置,来测量金属丝受到拉伸时的微小伸长量.实验研究和分析发现,相比于常用的光杠杆法,用千分表测量的3种不同金属丝材料的微小伸长量,可以提高精度3个数量级;需要测量的相关物理量减少了两个,使杨氏模量的测量精度提高一个数量级.该方法还具有装置简单,测量快速和结果准确等突出优点.更多还原

【Abstract】 A method of measuring young’s modulus of metal wires with dial gauge is introduced in this paper. Aiming at the deficiency of the common method to measure young’s modulus of metal wires, this method proposes to use a micrometer instead of the optical lever device to measure the tiny elongation of metal wires when it is stretched. Experimental research and analysis reveal that the accuracy of the tiny elongation of three different wire materials measured with a micrometer can be improved by three orders of magnitude compared with that obtained by the common optical lever method. Two less physical quantities need to be measured, and the measurement accuracy of young’s modulus is improved by an order of magnitude. At the same time, this method has the advantages of simple device, rapid measurement and accurate results.更多还原