Young's modulus meter and measurement method thereof

Abstract

The invention discloses a Young's modulus meter and a measurement method thereof. The Young's modulus meter comprises a frame, a fixing port, a coil, an 'F'-shaped permanent magnet, a ruler and a signal generator. One end of the frame is provided with the fixing port, the 'F'-shaped permanent magnet is vertically fixed to the frame, and the signal generator is connected with the coil through binding posts electrically. The coil is arranged between the fixing port and the permanent magnet, the fixing port, the coil and the permanent magnet are positioned on a same straight line, the ruler is transversely fixed to the frame and linearly parallel to the straight line, and an extension direction of an inner hole of the coil is parallel to the ruler. The Young's modulus meter not only has advantages of a suspension wire coupled resonance method but also can be used for measurement of Young's modulus of both a cylindrical steel wire and a rectangular-section steel sheet, looseness is avoided, and accuracy of measured Young's modulus of materials is achieved.

Description

technical field [0001] The invention relates to teaching experiment equipment, belongs to the technical field of physical experiment measurement, and in particular relates to a Young's modulus measuring instrument and a measuring method thereof. Background technique [0002] Young's modulus is an important mechanical parameter of solid materials. It marks the ability of materials to resist tensile (or compressive) deformation, and is one of the basis for selecting mechanical component materials. Young's modulus is an important parameter for the mechanical properties of materials. For linear materials, the formula δ=E·ξ holds true. In the formula, σ is the normal stress, ξ is the normal strain, and E is the elastic modulus, which is a constant related to the material. [0003] Suppose the cross-sectional area of ​​the steel wire is S and the length is L. If a tension F is applied along the length direction, the elongation of the steel wire is L. According to the definition o...

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Problems solved by technology

The optical lever amplification method belongs to the static loading method. Due to the large load, slow loading speed and the existence of relaxation process, it not only cannot truly reflect the change of the internal structure of the material, but also is not suitable for measuring brittle materials.

The suspension coupling resonance method belongs to the dynamic measurement method. Although it overcomes the above shortcomings, it needs to be equipped with special instruments, the cost is high, the measurement method is cumbersome, and the resonance frequency cannot be well judged on the oscilloscope, and how to do it after the resonance occurs. Judging whether it is the vibration of the symmetrical fundamental frequency or the vibration of the antisymmetric fundamental frequency

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