Experimental device and method for measuring Young's modulus of steel wire through resonance phenomenon

Abstract

An experimental device and method for measuring the Young's modulus of metal wire by using resonance phenomenon, relating to a Young's modulus measuring device and method, the present invention is to solve the experimental principle comparison of measuring the Young's modulus of metal wire in the current university physics experiment Single and abstract, it is difficult to adjust the telescope. The device of the present invention includes setting a crossbeam on the upper end of the support, setting an upper clamp and a vibration exciter in the middle of the beam, and the two ends of the metal wire are connected with the vibration exciter and the lower clamp respectively, and the lower clamp is fixed with an iron block. The vibrator is arranged, the vibrator is connected with the signal source, and the vibrator is connected with the amplifier and the oscilloscope; the method of the present invention utilizes the vibrator to convert the sinusoidal signal into a mechanical vibration, so that the metal wire spring vibrator is forced to vibrate, and the vibration is picked up. The converter converts it into an electrical signal, adjusts the frequency of the sinusoidal signal, and obtains the natural frequency of the wire spring vibrator when the waveform amplitude is maximum, and substitutes it into the formula to calculate the Young's modulus of the wire. The invention is applicable to the measurement of the Young's 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 by using a resonance phenomenon. 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 externa...

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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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