Experimental device and method for testing Young modulus through suspending fiber coupling flexural resonance method

Abstract

The invention relates to a Young modulus measuring device and method, in particular to an experimental device and method for testing Young modulus through a suspending fiber coupling flexural resonance method. The device and method aim at solving the problems that in an existing dynamic Young modulus measuring method in a physical test, material heating is not uniform, and resonant frequency estimation is inconvenient are solved. The device comprises a stainless steel water tank which contains heat conduction liquid and is arranged on a base, a sample bar to be tested is suspended below a vibration exciter and a vibration pickup through thin wires, the vibration exciter can be connected with a sweep generator and a sine signal source, and the vibration pickup can be connected with the sweep generator and an amplifier. The temperature of the heat conduction liquid, namely, the sample bar is changed through a temperature controller, the sample bar is heated uniformly, the sweep generator is utilized for obtaining the approximate value of resonant frequency through the amplitude-versus-frequency curve of the sample bar, the resonant frequency is further precisely determined through the sine signal source and an oscilloscope, and the Young modulus of the sample bar material can be obtained by substituting the resonant frequency into a formula. The device and method are used for measuring the Young modulus.

Description

technical field [0001] The invention relates to a physical experiment, in particular to an experimental device and method for measuring Young's modulus by a suspension wire coupling bending resonance method. 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 is r...

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Problems solved by technology

[0008] Thirdly, generally, according to the approximate range of the Young's modulus value of the material to be tested, the resonance frequency should be deduced according to the calculation formula, and then the resonance signal around this frequency value should be found. On the one hand, the calculation process is cumbersome; When the Young's modulus value of the material cannot be estimated, the resonance frequency cannot be estimated, so it will be difficult to find the resonance signal during the experiment

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