静态拉伸法测量金属丝杨氏模量的影响因素分析

Analysis on Influencing the Factors for Measuring Young's Modulus of Elasticity on Metal

本文主要从间接测量量的误差传递以及钢丝的弯曲状况这两个角度对静态拉伸法测杨氏模量的实验结果进行分析,结果表明:通过望远镜对加减砝码时直尺在平面镜中像的位置变化的测量,在所有直接测量量中,它给实验结果带来的误差最大;从钢丝有无弯曲处的角度进行分析,发现钢丝弯曲处的存在,导致杨氏模量的测量结果偏大,并且弯曲处越多,误差越大.

The experimental results of measuring Young's modulus of elasticity on metal are analyzed from two aspects,including the error 's transmission of indirect measurement and the bending of wire. The result shows that in the direct measurement of all,the greatest error results form the measurement of the position changes of the ruler in the plane mirror image. In addition,it is found that the more the existence of the bending of wireis,the larger the measurement results of Young's modulus and the errorare.