First, it is necessary to first perform the accuracy detection of the root bottom of the universal tensile testing machine before performing the tensile strength test . We need to prepare a tensile test sample, the force value is between 60-90% of the tensile test machine test interval. The sample was clamped on an electronic universal tensile testing machine , and the tensile strength test was performed on the standard sample by a tensile testing machine according to the standard speed of GB/T228-2002 .
When the sample is larger than 90% of the additional force of the tensile testing machine , it is necessary to stop the stretching immediately, and let the sample be stretched. Then, the sample of the sub-electronic universal tensile testing machine is attached with an extensometer or a strain gauge according to GB/T228. The -2002 standard allows the electronic universal tensile testing machine to test the tensile strength of the sample. The amount of stretch exhibited is calculated by Hooke's law, and the tensile value of the test is obtained. Comparison with the force value for a point on the tensile testing machine. By comparison , the situation and accuracy of the electronic universal tensile testing machine can be known .
The electronic universal tensile testing machine will wear and other problems in the long-term operation, so as the working time of the tensile testing machine is lengthened, the wear and damage will become more serious. These losses can cause the accuracy of the instrument to decrease. Some spare parts are accelerating the wear and damage of the electronic universal tensile testing machine because of the poor working conditions of the equipment . If normal usually possible to protect it during operation, it will cause the functionality and accuracy of the tensile testing machine in good condition. Therefore, how important it is to protect the electronic universal tensile testing machine on a daily basis .
Here, Wuhan National Instruments Xiaobian introduces us to several electronic universal tensile testing machines that require attention in the tensile strength test:
1. It is not allowed to bend the steel bars with things that do not match the diameter, especially the small diameter steel rods with large diameters.
2. After each tension tester is applied, the piston does not need to quickly fall to the bottom of the cylinder, which can leave a little distance, which is conducive to the next work.
3. When the electronic universal tensile testing machine is inactive for a long time, it should be coated with anti-rust oil on the outside and placed in a monotonous environment.
4. Adhere to the regular cleaning of the electronic universal tensile testing machine .
5. It is not allowed to stop and disassemble the equipment by professionals who do not understand the structure of the tensile testing machine .
6. The valve on the dynamometer should not be placed open to prevent dust and other impurities from falling into the interior, affecting the sensitive function of the tissue.
7. It is necessary to disconnect the electrical equipment before it is disconnected, otherwise it will easily damage the electronic components.
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