Inspection details of tensile testing machines for 2 kinds of materials

Tension testerAs a high-level testing equipment, strict verification is required before testing of various materials can be carried out before leaving the factory. Today, Jinan Hengsi Shanda Instrument Co., Ltd. has come up with the following methods with many years of experience, hoping to be helpful to the majority of users and friends.

1. The calibration method of universal material testing machine is characterized in that, first, the standard tensile sample is selected according to the force value of the tested range. The force value of the standard tensile sample is between 60% and 90% of the full range force value of the interval. The standard tensile sample is clamped on the tensile test machine, and the tension test machine is allowed to stretch the standard tensile sample according to the speed specified in GB/T228-2002 standard. When the pointer swings slightly, the stretching is stopped immediately, that is, the standard tensile test The sample is in a tensile state. At this time, an extensometer is installed on the standard tensile sample or a strain gauge is attached. The standard tensile sample is continued to stretch according to the speed specified in the GB/T228-2002 standard. The extensometer or strain gauge displays 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 as the standard tensile sample on the dial. The technical status and accuracy of the test machine are determined based on the difference in the comparison value.

2. According toMaterial testing machineThe force value of the test area is clamped on the test machine, and the test machine is allowed to stretch the standard tensile sample according to the speed specified in the GB/T228-2002 standard. When the standard tensile sample is in a tensile state, an extensometer or a strain gauge is installed on it, so that the tensile test machine can continue to stretch the standard tensile sample. The extensometer or strain gauge displays the elongation amount of the standard tensile sample, converts the elongation amount into the tensile value, and then compares it with the same force value point as the standard tensile sample on the tensile test machine dial, and determines the technical status and accuracy of the test machine based on the difference in the comparison value. This method uses Hooke's law to compare the elongation amount of the standard tensile test sample into force value and the force value of the test machine dial to determine the accuracy of the test machine. This method greatly simplifies the verification operation process and brings great convenience and standardization to the daily verification of the original tensile state of the test machine.

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