Measuring method for length of metal wire to be measured in young modulus measurement instrument

Abstract

The invention relates to a measuring method for the length of a metal wire to be measured in a young modulus measurement instrument. The method comprises the following steps that an insulation device is arranged between a lower chuck and a center hole in a platform or between an upper chuck and a cross beam; the metal wire is insulated from the platform or the cross beam; a resistance value of any section of the metal wire and a resistance value between the upper end and the lower end of the metal wire are measured by an electric measuring method; and the length between the lower end and the upper end of the metal wire is calculated according to the obtained resistance value of any section of the metal wire, the length of the section of the metal wire and the resistance value between the upper end and the lower end of the metal wire. According to the measuring method for the length of the metal wire to be measured in the young modulus measurement instrument, the length of the metal wire to be measured is measured by the electric measuring method, experimental measurement of a young modulus can be conducted by one person independently, and the measuring method has the advantages of simplicity, directness, accurate measuring results, and small errors.

Description

technical field [0001] The invention relates to an experimental measurement method, in particular to a method for measuring the length of a metal wire to be measured in a Young's modulus measuring instrument. Background technique [0002] Suppose the length of an object is L and the cross-sectional area is S. After a force F is applied along the length direction, the object will be stretched (or shortened) by △L. F / S is the force per unit area, called stress; △L / L is the relative deformation, called strain. In the range of elastic deformation, according to Hooke's law, the stress inside the object is proportional to the strain, and the ratio is called Young's modulus. Experiments have proved that Young's modulus E has nothing to do with the length L of the sample, the cross-sectional area S and the magnitude of the applied external force F, but only depends on the material of the sample. Considering the microstructure, Young's modulus is a physical parameter that character...

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Problems solved by technology

[0006] The present invention aims to solve the technical problem that the length of the metal wire in the Young's modulus measuring instrument in the prior art cannot be measured independently by a single person, and provides a method for measuring the length of the metal wire in the Young's modulus measuring instrument that can be independently measured. Measurement methods

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