Universal testing machine, a material testing machine integrating tensile, bending, compression, shearing, ring stiffness and other functions, is mainly used for the mechanical property test of metal and non-metallic materials. It is an ideal testing equipment for industrial and mining enterprises, scientific research institutions, colleges and universities, engineering quality supervision stations and other departments.

Universal testing machine is a mechanical testing machine that can carry out various tests such as tension, compression, bending and torsion. The most common types are lever swing and oil pressure swing.

Main functions:

Common test items:

Tensile stress, tensile strength, breaking strength, breaking elongation, constant tensile stress, constant stress elongation, constant stress force value, tear strength, force value at any point, elongation at any point, pull-out force, bonding force and peak value calculation, pressure test, shear peeling force test, bending test, pull-out force puncture force test.

Special test items:

1. Definition of property coefficient, i.e. Young's modulus of elasticity: ratio of normal stress component and normal strain in the same phase. To determine the coefficient of material rigidity, the higher the value, the stronger the material.

2. Proportional limit: the load can maintain a proportional relationship with the elongation within a certain range, and the maximum stress is the specific limit.

3. Elastic limit: the maximum stress that the material can bear without permanent deformation.

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

5. Permanent deformation: after removing the load, the material still remains deformed.

6. Yield point: when the material is stretched, the deformation increases while the stress remains unchanged, which is called the yield point. The yield point is divided into upper and lower yield points. Generally, the upper yield point is taken as the yield point. Yield: When the load exceeds the proportional limit, it is no longer in direct proportion to the elongation. The load will suddenly drop, and then fluctuate up and down for a period of time. This phenomenon is called yield.

7. Yield strength: the load under which the permanent elongation reaches a specified value during tension, divided by the original sectional area of the parallel part, the quotient is obtained.

8. Spring K value: the ratio of force component in phase with deformation to deformation.

Operating procedures:

1. Turn on the main switch.

2. Select the measuring range according to the sample, hang or remove the thallium on the swing rod, adjust the handle of the buffer valve and align it with the marking.

3. Install the corresponding chuck into the upper and lower jaw seats according to the shape and size of the sample.

4. Roll and press the recording paper (checkered paper) on the rotary cylinder of the plotter. This is only done when necessary.

5. Start the oil pump motor, unscrew the oil feeding valve to raise the test bench by 10mm, and then close the oil valve. If the test bench is already in the raised position, it is not necessary to open the oil pump to feed oil first, just close the oil feeding valve.

6. Clamp one end of the sample in the upper jaw.

7. Start the oil pump to adjust the pointer to align with the zero point of the dial.

8. Start the lower jaw motor, lift the lower jaw to a proper height, clamp the other end of the sample in the lower jaw, and pay attention to make the sample vertical.

9. Put down the drawing pen on the push rod to enter the drawing preparation state (only when drawing is required).

10. According to the loading speed required by the test, slowly unscrew the oil delivery valve for loading test.

11. After the sample breaks, close the oil valve and stop the oil pump motor.

12. Record the required values and describe them.

13. Open the oil return valve and turn the passive needle back to zero after unloading.

14. Remove the fractured specimen.

15. The compression, bending and other tests can be conducted according to the above items.