Verification method of universal material tensile testing machine
ã€Tensile testing machine】 Verification method of universal material tensile testing machine
According to the force value of the tested section of the testing machine, the standard tensile sample of the corresponding force value is clamped on the testing machine, and the testing machine is allowed to stretch the standard tensile sample at the speed specified in the GB / T228-2002 standard. When the specimen is in tension, install an extensometer or attach a strain gauge on it, and let the tensile testing machine continue to stretch the standard tensile specimen. The extensometer or strain gauge will display the elongation of the standard tensile specimen. Convert the elongation to the tensile value, and then compare it with the same force value point on the dial of the tensile testing machine as the standard tensile sample, and determine the technical status and accuracy of the testing machine according to the difference of the comparison value. This method uses Hooke's law to compare the force value of the standard tensile sample with the force value and compare it with the dial force value of the testing machine to determine the accuracy of the testing machine. This method greatly simplifies the verification process and brings great convenience and standardization to the daily verification of the original tensile state of the testing machine.
1. The verification method of the universal material testing machine is characterized in that, firstly, a standard tensile sample is selected according to the force value of the tested section, and the force value of the standard tensile sample is 60% to 90% of the full-scale force value of the section Choose between the standard tensile sample and the tensile test machine, and let the tensile test machine stretch the standard tensile sample at the speed specified in the GB / T228-2002 standard. When the pointer swings slightly, stop stretching immediately, that is, The standard tensile specimen is in a tensile state. At this time, install an extensometer or attach a strain gauge on the standard tensile specimen, and continue to stretch the standard tensile specimen at the speed specified in the GB / T228-2002 standard. The extensometer or strain The piece shows the elongation of the standard tensile sample. According to Hooke's law, the elongation is converted into a tensile value, and then compared with the same force value point on the dial as the standard tensile sample. According to the comparison value To determine the technical status and accuracy of the testing machine.
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