Measuring Principle Of Tensile Testing Machine

1. The force value of the tensile testing machine is measured through the force sensor, amplifier and data processing system. According to data mechanics, under the premise of small deformation, the strain at a certain point of an elastic element ε It is directly proportional to the force on the elastic element and also to the deformation of the elastic element. Take the sensor of 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 the strain of the elastic element is in direct proportion to the size of the external force P, so connect the strain gauge into the measuring circuit, then measure its output voltage, and then measure the size of the force.
2. The deformation is measured through the deformation measurement installation, which is used to measure the deformation of the sample during the experiment process. There are two collets on the installation, which are connected with the photoelectric encoder installed on the top of the measurement installation through the primary memory head structure. When the interval between the two collets changes, the shaft of the photoelectric encoder is driven to rotate, and the photoelectric encoder will have pulse signal output. Then the signal is processed by the processor, and the deformation of the sample can be obtained.
3. The principle of beam displacement measurement is roughly the same as that of deformation measurement. The beam displacement is obtained by measuring the output pulse number of the photoelectric encoder.