Constant force control
Control accuracy: The constant force control mode is mainly used to keep the test force constant during the material testing process. When the set value is greater than or equal to 10% of the full scale (FS), the control accuracy is within ±0.5% of the set value; when the set value is less than 10% FS, the accuracy is within ±1% of the set value. Application characteristics: This mode is particularly suitable for tests that require stable tension or pressure, such as creep tests and stress relaxation tests of materials, to ensure stable output of force during the test so as to observe the performance changes of the material under constant force.
Constant speed control
Speed range: The constant speed control mode involves the constant deformation speed of the material during the test. Using PID control technology, constant speed control of strain can be achieved, with a speed range from 0.00025/S to 0.0025/S, and a load holding function.
Application features: The constant speed control mode is particularly important for tests that require rate control. For example, the tensile rate of the material has a significant impact on the test results. This ensures that the material deformation rate is consistent during the test, thereby accurately measuring the material at different rates. mechanical properties under.
Constant displacement control
Control accuracy: In constant displacement control mode, the test machine is controlled according to the preset displacement change rate. Similarly, its control accuracy is within ±0.5% of the set value when the set value is ≥10%FS; and within ±1% of the set value when the set value is <10%FS.
Application features: This mode is mainly used to accurately control the displacement change of materials during the stress process, especially in tests that require precise displacement control, such as elastic modulus determination and yield point detection, to ensure the accuracy and repeatability of the test process.
In addition, the application of these control modes enables the universal material testing machine to adapt to a variety of different materials and their test requirements, from rubber, plastic to metal and other different types of materials, can be accurately evaluated on it. At the same time, when selecting and using a universal material testing machine, it is necessary to consider its technical parameters to match the test requirements, such as maximum load, measurement range, test stroke, etc., as well as its operational convenience and maintenance requirements in actual applications, to ensure the smooth progress of the test and the service life of the equipment.
