Detailed explanation of the test process of torsion test machine

Torsion test machineThere are many models, divided into manual, fully automatic and microcomputer-controlled instruments and equipment. The following content is a detailed description of the torsion test machine test process by Jinan Hengsi Shanda Instrument Co., Ltd.

1. Disposal of experimental consequences

2. Calculation of torsion strength: Actively deal with the torsion test machine in a special order.

3. Shear modulus of material

The shear modulus G of the material can be determined by the change experiment of the circular cross-sectional sample according to GB/T10128. When conducting a circular cross-section sample change experiment within the elastic limitation, the relationship between the torque factory and the changing angle is consistent with the Hook's law of changing deformation, where: is the extreme moment of inertia of the cross-section. When the length 1 and the extreme moment of inertia Ip are both known, the shear modulus of the obtained material can be calculated by measuring the torque increment ΔT and the changing angle increment ΔΦ of the response. The experiment uses multi-level equal-increment loading method, which not only prevents errors in the remuneration reading data, but also changes the deformation Hooke's law through each load increment and change angle increment verification.

Torsion test machineThe relationship between the three elastic constants E, μ, and G was found in the material manual. The elastic modulus E and Poisson's ratio μ were calculated. The shear modulus Gtr of the material was calculated. If the calculated value Gtr is taken as the true value, the G value obtained by the test can be compared with the Gtr value to check the test error.

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