Experimental device and method for measuring Young modulus of metal wire according to simple harmonic vibration

Abstract

The invention relates to a device and method for measuring the Young modulus, in particular to an experimental device and method for measuring the Young modulus of a metal wire according to simple harmonic vibration.The device and method aim at solving the problems that the experiment principle for measuring the Young modulus of the metal wire in a college physics experiment is single and abstract in the prior art.According to the device, a cross beam is arranged at the upper end of a support, an upper chuck and a force sensor are arranged in the middle of the cross beam, the two ends of the metal wire are connected with the force sensor and a lower chuck respectively, and the lower chuck and a metal frame into which an iron block is fixed are fixed together.A measuring device is composed of a differential bridge composed of four capacitors composed of fixed polar plates and movable polar plates, an adjustable alternating voltage source, a voltage amplifying device, a digital oscilloscope and the like.According to the method, the digital oscilloscope is used for measuring the period of periodically-changing bridge output voltage waveforms, the period during which a metal wire spring oscillator conducts simple harmonic vibration is obtained, the period is substituted into a formula, and the Young modulus of the metal wire is calculated.The device and method are suitable for measuring the Young modulus of the metal wire.

Description

technical field [0001] The invention relates to a university physics experiment device, in particular to an experiment device and method for measuring the Young's modulus of a metal wire according to simple harmonic vibration. Background technique [0002] The change in shape of a solid under the action of an external force is called deformation. It can be divided into elastic deformation and normative deformation. The deformation that an object can completely return to its original shape after the external force is removed is called elastic deformation. If the external force applied to the object is too large, so that after the external force is removed, the object cannot completely return to its original shape, leaving residual deformation, which is called normative deformation. In this experiment, only elastic deformation is studied. Therefore, the magnitude of the external force should be controlled to ensure that the object can return to its original shape after the ...

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Problems solved by technology

[0005] First, the Young's modulus of metal wire is usually measured by static stretching method, and the principle is relatively simple

[0006] Second, according to the optical lever amplification principle, the tiny elongation of the metal wire is measured through the amplification system composed of optical levers, telescopes and rulers. Although the method is ingenious, the principle is abstract and difficult to understand. The adjustment of the telescope is relatively difficult. Notes There are many, and it is very easy to get tired and make mistakes in the data, which will affect the accuracy of the measurement results.

[0007] Third, weights are generally used to apply tension to the wire, and the nominal mass of the weights is used to calculate the tension inaccurately, thus affecting the accuracy of the experimental results

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