Cross metal wire elastic modulus measuring device and method

Abstract

The invention discloses a cross metal wire elastic modulus measuring device and method. The cross metal wire elastic modulus measuring device comprises a base, a base level gauge, a base foot screw, a crossbar, a leveling weight, a crossbar slide groove, a crossbar level gauge, a vertical bar, a vertical bar scale plate, a vertical bar slide groove, a slide screw, a laser transmitter, an arc receiving screen and a display device. Elongation of a metal wire is converted to inclination of the crossbar by utilizing the crossbar and the vertical bar, which are hinged in a cross shape, a small inclination angle of the crossbar is converted to observable arc length by virtue of the laser transmitter, the arc receiving screen and the display device, and the elastic modulus of the metal wire is obtained by establishing a relation among the arc length, inclination angle and elongation of the metal wire. The measurement principle is clear, the stretching process of the metal wire can be clearly demonstrated, the debugging of a complex optical system is avoided, the length measurement error of the metal wire is reduced by virtue of the precise leveling of the leveling weight, the measurement precision is high, the stability is good, and the cross metal wire elastic modulus measuring device and method are an experimental device and method suitable for physical 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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