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# Special testing items for tensile testing machines

2024-01-05 14:05

The tensile testing machine mainly tests the yield strength, tensile strength, elongation after fracture, section shortening rate, bending test, stiffness, etc.

But with the rapid progress of technology and the continuous increase in industrial demand.

Special test items:

1. Elastic coefficient, also known as Young's modulus of elasticity:

The ratio of normal stress weight to normal strain in the same phase. To determine the coefficient of material rigidity, the higher the value, the stronger and tougher the material.

2. Proportional limit: The maximum stress at which a load can maintain a proportional relationship with elongation within a certain range is the proportional limit.

3. Elastic limit: The maximum stress that a material can accept without enduring deformation.

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

5. Persistent deformation: After removing the load, the material still retains deformation.

6. Submission point:

When the material is stretched, the deformation increases rapidly while the stress remains constant, and this point is called the yielding point.

The submission point is divided into upper and lower submission points, usually the upper submission point is used as the submission point.

Yield:

When the load exceeds the proportional limit and is no longer proportional to the elongation, the load will suddenly decrease;

Then, over a period of time, there is a significant change in elongation due to ups and downs, which is called submission.

7. Resilience strength: The quotient obtained by dividing the load at which the elongation reaches a certain regular value during stretching by the original cross-sectional area of the parallel part.

8. Tensioning spring K value: the ratio of the weight of the force in the same phase as the deformation to the deformation.

9. Useful elasticity and hysteresis loss:

When stretching the specimen to a certain elongation or to a regular load at a certain speed on a tensile testing machine;

The effective elasticity is determined by measuring the percentage of the work spent on rehabilitation during sample shortening and the work spent on propagation;

The percentage of energy lost during sample elongation and shortening compared to the work expended during elongation is called hysteresis loss.

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