Experiment device and method adopting resonance vibration to measure Young modulus of metal wire

Abstract

The invention provides an experiment device and method adopting resonance vibration to measure the Young modulus of a metal wire, relates to a Young modulus measuring device and method, and aims to solve problems that in the conventional university physical experiments, the experiment principle for measuring metal wire Young modulus is single and abstract, and the telescope is hard to adjust. The device comprises a crossbeam, which is arranged on the upper end of a support. An upper clamping head and a force sensitive sensor are arranged on the middle of the crossbeam. Two ends of a metal wire are respectively connected to the force sensitive sensor and a lower clamping head. The lower clamping head and a metal frame are fixed together, and an iron block is fixed in the metal frame. A measuring device is composed of a differential bridge composed of four magnetic sensitive resistors, an adjustable alternating voltage source, a voltage amplifying device, and a digital oscilloscope. The period of voltage waveform output by the differential bridge with periodic changes is measured by the digital oscilloscope to obtain the period of a metal wire spring oscillator that performs simple resonance vibration. The period of the metal wire spring oscillator is substituted into a formula to calculate the Young modulus of the metal wire. The provided method is suitable for measuring the Young modulus of a 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 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 external f...

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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 und

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