Experiment apparatus and experiment method for measuring Young's modulus through beam bending method using resonance phenomenon

Abstract

The experimental device and method for measuring Young's modulus by the beam bending method using the resonance phenomenon relates to a Young's modulus measuring device and method. Difficult question. The device of the present invention includes setting two columns on the base, the two ends of the metal beam with rectangular cross-section are freely straddled on the knife edge of the upper end of the column, a copper frame is placed on the metal beam, and a vibration exciter, an iron block and a vibration picker are arranged at the lower end , the exciter can be connected with the frequency sweeper and the sinusoidal signal source respectively, and the vibration pick-up can be connected with the frequency sweeper and the amplifier respectively; the method of the present invention utilizes the exciter to convert the sinusoidal signal into mechanical vibration, so that the metal beam spring vibrator can do For forced vibration, use a frequency sweeper to obtain the approximate value of the resonance frequency through the amplitude-frequency characteristic curve of the metal beam spring vibrator, use a sinusoidal signal source and an oscilloscope to further accurately determine the resonance frequency, and obtain Young's modulus. The invention is applicable to the measurement of Young's modulus.

Description

technical field [0001] The invention relates to a university physics experiment, in particular to an experimental device and method for measuring Young's modulus by beam bending method using 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 external force...

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Problems solved by technology

[0005] First, the static tensile method is usually used to measure the Young's modulus of metal materials, and the principle is relatively simple

[0006] Second, according to the optical lever amplification principle, the sag of the midpoint of the rectangular cross-section metal beam is measured through the amplification system composed of the optical lever, the telescope and the ruler. Although the method is ingenious, the principle is abstract and difficult to understand, and the adjustment of the telescope is relatively difficult. It is large, and there are many precautions, 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 metal beams, and the calculation of tension with the nominal mass of weights is inaccurate, thus affecting the accuracy of experimental results

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