Measuring device and method for elastic modulus of cross-shaped metal wire

Abstract

The invention discloses a cross-shaped metal wire elastic modulus measuring device and method, which comprises a base, a base level, a base screw, a cross bar, a leveling weight, a cross bar chute, a cross bar level, a vertical bar, a vertical Rod ruler, vertical rod chute, sliding screw, laser transmitter, curved receiving screen, display. The present invention utilizes the horizontal bar and the vertical bar arranged in a cross-shaped hinge to convert the elongation of the metal wire into the inclination of the horizontal bar, and converts the tiny inclination angle of the horizontal bar into an observable arc through the laser emitter, the arc receiving screen and the display. Long, the elastic modulus of the wire is obtained by establishing the relationship between the arc length, the inclination angle and the elongation of the wire. The invention has a clear measurement principle, can clearly demonstrate the stretching process of the metal wire, avoids complex optical system debugging, uses leveling weights to accurately level the measurement error of the metal wire length, and has high measurement accuracy and good stability. Experimental devices and methods suitable for physics teaching and scientific research.

Description

technical field [0001] The invention relates to a physical experiment instrument and an experiment method, in particular to a cross-shaped metal wire elastic modulus measurement device and method. Background technique [0002] The modulus of elasticity reflects the ability of a material to resist deformation caused by external forces, and is one of the basic mechanical properties of a material. Measuring the elastic modulus of metal wire is an important content of university physics experiment teaching. The key problem in the experiment of measuring the elastic modulus of metal wire is to obtain the elongation of the metal wire under the action of vertical load, but this elongation is usually a For such a small length, conventional measurement methods cannot meet the experimental requirements. [0003] In the existing university physics experiments, the optical lever method is widely used to measure the elastic modulus of the metal wire. The optical lever method uses the op...

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Problems solved by technology

However, this method is difficult to adjust the optical system composed of the optical lever mirror, telescope and scale. After the adjustment, it is easily disturbed, the stability is poor, and the accuracy of the experiment is affected. The experimental operation is complicated and the measurement is time-consuming.

Therefore, using the optical lever method to measure Young's modulus of elasticity requires the operator to be precise and skilled in operation, and the accuracy of the measurement results is greatly affected by human factors.

Due to the limitation of students' proficiency in practical teaching, it is difficult to obtain ideal experimental results

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