The main structure of cast in rail shoulders is introduced:

cast in rail shoulders is composed of digital AC servo drive system, accounting machine control, data acquisition and processing system. The loading speed of the whole experiment is not affected and remains unchanged. Data measurement consists of torque sensor, photoelectric encoder and so on. The torque of the sample is collected by the sensor cast in rail shoulders, and the torsion Angle of the sample is collected by the photoelectric encoder. When testing the shear modulus of the material, a variation meter should be added. The experiment is controlled by an accounting machine, which processes the data and outputs the results.

cast in rail shoulders operation process:

1. Sample preparation

According to the regulations, as well as the test machine fixture type and size, prepare the standard sample.

2. Sample clamping

The holding of the sample is very important. When clamping, the sample is first inserted into the static chuck end (the end with the sensor), and then the dynamic chuck of the experimental machine is adjusted so that the sample can easily enter the dynamic chuck. After loading the sample, be careful not to twist the dynamic chuck.

3. Experimental process

After the sample is clamped, the experiment can begin. First clear the torque display window to zero. Select the loading speed according to the material characteristics. If you want to measure the shear modulus of the sample, you need to add a change meter.

The shear modulus g of a cast in rail shoulders material can be determined by an experiment with a sample of varying circular cross-section. In the experiment of the sample with a circular cross-section within the elastic limit, the relation between the torque plant and the variable Angle conforms to Hooke's law of variable deformation, where: the polar moment of inertia of the cross-section. When the sample length L and the polar moment of inertia Ip are known, the shear modulus of the material can be obtained by measuring the response of the torque increment δt and the change Angle increment δφ. The multi-stage and equal incremental loading method is adopted in the experiment, which can not only prevent the error of the reward reading data, but also change the Hooke's law of deformation by verifying each load increment and variable Angle increment.

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