Measuring Principle of Tensile Testing Machine
July 15,2022
- The measurement of the force value of the tensile testing machine is completed through the force measuring sensor, expander, and data processing system. It is known from the data mechanics that under the premise of small deformation, the strain at a certain point of an elastic element ε is directly proportional to the force on the elastic element and also directly proportional to the elastic deformation. Taking the sensor of an S-type testing machine as an example, when the sensor is subjected to the effect of tension P, because the elastic element is pasted with a strain gauge on the surface, and because the strain of the elastic element is in direct proportion to the size of the external force P, the strain gauge is connected to the measuring circuit, and then the output voltage can be measured, and then the size of the output force can be measured.
- The deformation measurement is carried out through the deformation measurement installation, which is used to measure the deformation of the sample during the experimental process. There are two chucks on the installation, which are connected with the photoelectric encoder installed on the top of the measurement installation through the primary transmission memory head structure. When the interval between the two chucks changes, it drives the shaft of the photoelectric encoder to rotate, and the photoelectric encoder will have pulse signal output. The deformation of the sample can be obtained by processing this signal by the processor.
- The principle of beam displacement measurement is roughly the same as that of deformation measurement. The displacement of the beam is obtained by measuring the output pulse number of the photoelectric encoder.
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