The universal testing machine is mainly suitable for testing the mechanical properties of metal, non-metal, building materials and thermal insulation materials, such as tension, compression, bending, shear, tear, peeling, compression and bending. In addition, equipped with a wide variety of test accessories, it has a very broad application prospect in the mechanical property test of metal, non-metal, composite materials and products. Today, Xiaobian will explain the universal testing machine in detail.

1. Main functions of universal testing machine:

1. General test items:

Tensile stress, tensile strength, tensile strength, elongation at break, constant tensile stress, constant stress elongation, constant stress value, tear strength, force value at any point, elongation at any point, pull-out force, adhesion force and calculated value of peak value, pressure test, shear peel force test, bending test, pull-out force puncture force test.

2. Special test items:

① The elasticity coefficient is the definition of Young's modulus of elasticity: the ratio of normal stress component in phase to normal strain. In order to determine the coefficient of rigidity of the material, the higher the value, the stronger the material.

② . proportional limit: the relationship between load and elongation can be maintained in direct proportion within a certain range, and its 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 rapidly and the stress remains unchanged. This point is the yield point. The yield point is divided into upper and lower yield points. Generally, the above yield point is used as the yield point. Yield: when the load exceeds the proportional limit, it is no longer proportional to the elongation. The load will drop suddenly, and then fluctuate up and down over a period of time, resulting in great changes in elongation. This phenomenon is called yield.

⑦ . yield strength: the quotient of the load on which the permanent elongation reaches a specified value during tension divided by the original sectional area of the parallel part.

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

Universal testing machine is a high-precision testing instrument. Daily maintenance is of great significance to ensure the normal operation and measurement accuracy of the equipment.

2、 Maintenance of universal test oil source:

1. Regularly check whether there is oil leakage at the main engine and oil source. If there is oil leakage, replace the sealing ring or combined gasket in time;

2. According to the service condition of the machine and the service life of the oil, regularly replace the oil suction filter and filter element, and replace the hydraulic oil.

3. When the test is not conducted for a long time, pay attention to turn off the power supply of the host. If the machine is in standby mode, the change-over switch should be turned to the "load" position, because if the change-over switch is turned to the "fast back" position, the electromagnetic directional valve will be energized all the time, which will affect the service life of the device.

3. Maintenance of universal testing machine host:

1. The fixture equipped with the machine shall be coated with anti rust oil for storage;

2. Since the jaws of the universal testing machine are often used, they are easy to wear, and when there is too much oxide skin, it is easy to cause damage and oil leakage of the small piston, so the jaws should be cleaned frequently and kept clean (it is best to clean after each test);

3. The sliding surface between the inlaid steel plate and the lining plate and the dovetail groove surface on the lining plate shall be kept clean, and a thin layer of MoS2 (molybdenum disulfide) grease shall be coated regularly;

4. Regularly check the screws at the jaw. If they are loose, tighten them in time;

5. Regularly check the transmission of the sprocket. If it is found to be loose, please re tension the tensioning wheel;

4、 Maintenance of universal testing machine control system:

1. Regularly check whether the connecting wire of the rear panel of the controller is in good contact. If it is loose, it shall be fastened in time;

2. If the machine is not used for a long time after the test, turn off the controller and computer;

3. The interfaces on the controller are one-to-one correspondence, and the wrong interface may cause damage to the equipment;

4. When plugging in and out the interface on the controller, the controller power must be turned off.