What is the reason for the inaccurate yield strength measured by the electronic universal test machine

Recently, some customers often call whyElectronic universal testing machineThe measured yield strength value is inaccurate, and the tensile strength value is fine. Many customers call with this question, and the main reasons are as follows:
1. What material is the sample tested? Is the yield of this material obvious? If it is obvious, it means there is really a problem, and the following points need to be checked:
1. Whether the tester's operation is correct.
2. Is there any problem with the material?
3. Whether there is any problem with the software needs to be consulted with the manufacturer to solve it.
2. The yield of the tested materials is unknown, and the following points need to be checked:
1. Since the material yield is not obvious, it is necessary to measure it with an electronic extensometer to see if there is an extensometer during the test. If not, contact the manufacturer to purchase one.
2. If there is an electronic extensometer, it is considered as whether the sample has slippage during the test. If there is slippage, it will affect the measurement results of the yield strength.
3. Whether the electronic extensometer is calibrated correctly, please check
4. The problem of whether it is software must be solved by the manufacturer.

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