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The universal tensile testing machine can analyze the effect of the whole test, such as: B. Elongation, stress, elongation, damage value, average value, etc. The universal tensile testing machine can also cooperate with the type or requirement of the test guideline to destroy the test piece and get the whole test process to measure the physical properties of the test sample such as tensile force, compressive strength, To analyze flexural strength, fatigue, peel force, deflection, etc. There are also test piece making equipment such as air pressure test piece cutting machine, hard test piece cutting machine, hot press molding machine, etc., which can make standard test pieces to make the inspection more accurate.
Static and dynamic accuracy of universal tensile testing machine inspection:
1. UniversalStatic accuracy of tensile testing machine
With respect to the range of each force, it is specifiedthat the accuracy level of the testing machine is level 1 or level 2, and the testing machine The grading of each measurement range is determined according to the precision and accuracy values measured when testing the testing machine.
The standard specifies the maximum allowable value of level 1 and level 2 precision and accuracy, and the graphical explanation of the error is given in the standard. If the testing machine has a dedicated area for compression or other testing, those areas should be independently verified.
The inspection method should be based on relevant standards, and the equipment that passed the inspection should be within the accuracy limit specified in Table 1. Assuming that the testing machine is to be used to measure cyclic force, it should be tested with two methods of force increase and force decrease.
2. Universal tensile testing machineDynamic accuracy
Equipped with electronic force measurement The tensile strength The testing machine of the equipment can be considered as having no inertia at all test speeds specified in chapter 9 of the standard. However, this does not necessarily apply to their usual electronic recorders, whose dynamic inaccuracies in many cases far exceed their static inaccuracies.
All electromechanical recorders exhibit dynamic errors, generally due to acceleration errors caused by equipment inertia and stylus hysteresis errors caused by the conflict between machines and static electricity. The best way to measure the recorder's dynamic accuracy is to record the magnitude of the error signal during the test. This can be achieved without compromising instrument performance, but is often technically difficultG. Therefore, it is considered impractical to specify dynamic accuracy limits and calibration methods in this standard. Therefore, the user should obtain the recorder dynamic accuracy chart from the universal tensile testing machine manufacturer to calculate the probability measurement error and evaluate whether the error is significant. In the event of such a dynamic error, the acceleration and speed can be reduced by reducing the test speed or increasing the full scale of the output device.
Wuhan Guoliang Instrument specializes in the manufacture of electronic tensile testing equipment Manufacturers of inspection machine tensile testing machines, universal tensile testing machines and other testing instruments. Among the testable Materials include: rubber, plastic, metal, geotextile, etc. Welcome to the consultation!
