9 special test processes for hydraulic universal testing machine

Hydraulic universal testing machineWhether a variety of materials can be tested is the key to the selection of the test machine fixture. In addition to common material testing, the test machine usually has some special tests. The following is a detailed explanation of the 9 steps provided by Jinan Hengsi:

1. The elastic coefficient is the elastic Young's modulus

Definition: The ratio of normal stress weight to normal strain in the same phase. In order to determine the coefficient of rigidity of the data, the higher the value, the stronger the data.

2. Proportional limit: The load can be maintained in a proportional relationship with elongation within a certain range, and its stress is the proportional limit.

3. Elasticity limit: The stress that is acceptable to the data without eternal deformation.

4. Elastic deformation: After removing the load, the deformation of the data disappears completely.

5. Eternal deformation: After removing the load, the data remains deformation.

6. Effective elasticity and hysteresis loss:Universal testing machineIn the test project, when the sample is stretched to a certain elongation or stretched to a regular load at a certain speed, the percentage of the ratio of the work recovered when the sample is contracted and the work consumed when the sample is stretched is measured, which is the effective elasticity; the percentage of the ratio of the energy lost during elongation and shrinkage to the work consumed when the sample is stretched, which is the hysteresis loss.

7. Flexibility: When stretching, the load weight at which the eternal elongation reaches a certain regular value is divided by the original section area of ​​the parallel part, and the quotient obtained.

8. Spring K value: The ratio of force weight and deformation in phase with deformation.

9. Compliance point: When the data is stretched, the deformation increases rapidly and the stress remains unchanged. This point is the compliance point. The surrender point is divided into the surrender point, and the surrender point above is usually used as the surrender point. yield: The load exceeds the proportion limit and is no longer proportional to the elongation. The load will suddenly drop, and then rise and fall over a period of time, and the elongation will undergo major changes. This phenomenon is called surrender.

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