Novel tensile-method young's modulus measurement instrument

Abstract

The invention discloses a novel tensile-method young's modulus measurement instrument, which comprises a measurement system and a reading system, wherein the measurement system comprises a first chassis, a prop, a lower prop fixing plate, an upper prop fixing plate, an optical lever, an upper chuck, a lower chuck, a top yoke plate, a sliding yoke plate, a tension meter, a threaded rod and two guide rods; the top yoke plate is connected with tow support plates used for supporting the lower prop fixing plate through two connecting plates, and a handle is also arranged above the top yoke plate; the tension meter is fixedly connected with the sliding yoke plate; and the upper end of the tension meter is fixedly connected with the lower chuck. The novel tensile-method young's modulus measurement instrument can overcome the measurement difficulty of the current measurement system due to the change of the relative position of eyes, can also overcome disturbance caused by the change of steel wire stress and the reading influence caused by the position of eyes, and meanwhile can increase the measurement precision of young's modulus.

Description

technical field [0001] The invention relates to a measuring device, in particular to a novel tensile method Young's modulus measuring instrument. [0002] Background technique [0003] At present, the metal wire Young's modulus measurement system in the university physics laboratory is mainly composed of a bracket, a level, a chuck, a weight holder, a steel wire, a light lever, a weight, a telescope and a luminous scale system. The difficulty in measuring Young's modulus lies in how to measure the deformation of the material caused by the change of external force. The old-fashioned Young's modulus measurement system changes the force on the steel wire by adding or subtracting weights on the weight holder to change The elevation angle of the light lever changes, which in turn causes the data change of the luminous scale observed from the binoculars to amplify the small change of the steel wire for measurement, and the accuracy of the read out data is not high. Since the cur...

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Problems solved by technology

The difficulty in measuring Young's modulus lies in how to measure the deformation of the material caused by the change of external force. The old-fashioned Young's modulus measurement system changes the force on the steel wire by adding or subtracting weights on the weight holder to change The elevation angle of the light lever changes, which in turn causes the change of the luminous scale data observed from the telescope to achieve the purpose of amplifying the small change of the steel wire for measurement, and the accuracy of the data read out is not high

Since the current measurement process mainly uses the weight to stretch the steel wire to be tested, when the weight is added each time, the lower end of the steel wire to be tested will be disturbed, which will cause the system to grow due to changes in the force. Small changes in time cause reading difficulties, and small changes in the relative position of the human eye relative to the eyepiece of the telescope eyepiece when reading data through the telescope will also cause corresponding reading errors

And because the mass of the weight is fixed, the force on the steel wire to be tested is discontinuous during the whole measurement process, so that the data cannot be measured continuously, and it is not conducive to accurately measure the Young's modulus of the steel wire to be tested

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