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How does the standard and tension test work

Source: Tensile testing machine June 19, 2018 Keywords: Tensile testing machine    

The precision of high precision testing instruments such as tensile testing machine has reached the national accuracy level of 0.5. The tensile testing machine is manufactured according to the standard GB / T 16491-2009 of electronic universal testing machine, and verified and accepted by GB / t16825-2010 inspection of tensile testing machine. The test and data are provided according to GB, ISO, DIN, ASTM, JIS and other international standards. The national standards, industrial standards and international standards are strictly followed.  

Tensile testing machine The mechanical part is driven by the motor, and the speed is reduced to the required speed by the worm gear reducer, and then driven by the screw rod. After the positive and negative rotation of the motor, the intermediate connecting plate moves up and down to cooperate with the clamp, so as to realize the pulling and pressing process. The driving screw rod is equipped with three bearings (two on the upper connecting plate, A guide rod is installed behind the screw rod, which is mainly used to guide the middle connecting plate to keep balance when it rises and descends. The principle of measuring the displacement of the cross beam is roughly the same as that of the deformation measurement. The displacement of the beam is obtained by measuring the output pulse number of the photoelectric encoder.  

1. The force value of tensile testing machine is measured by force sensor, amplifier and data processing system. It is known from data mechanics that under the condition of small deformation, the strain at a certain point of an elastic element is directly proportional to the force exerted on the elastic element and also to the elastic deformation. Taking the sensor of S-type testing machine as an example, Shanghai Farui instrument adopts the imported sensor of American brand. When the sensor is subjected to the effect of tension P, because the strain gauge of the elastic element is pasted on the surface of the elastic element, the strain of the elastic element is positively proportional to the size of the external force P. therefore, the strain gauge is connected into the measuring circuit to measure its output voltage and then the magnitude of the output force.  

    2、 Metal tensile testing machine The core device of the software operating system adopts the latest imported ultra-high precision 24 bit ad. the sampling rate is 400 times / s, and the resolution is 100000 divisions. Three point calibration technology is used to further improve the accuracy, and the power acquisition accuracy reaches the national 0.1 level standard. Communication with PC, equipped with special fr2101pro professional luxury version measurement and control software, real-time display of force displacement, force time, displacement time, stress-strain curves, automatic calculation of maximum force, yield strength, average force, maximum deformation, yield point, elastic modulus and other parameters, and flexible report editing and printing functions.  

3. The deformation measurement is measured by the deformation measurement installation. It is used to measure the deformation of the sample in the process of experiment. There are two chucks on the installation, which are connected with the photoelectric encoder installed on the top of the measurement installation through a series of transmission head structure. When the interval between the two collets changes, the shaft of the photoelectric encoder is twisted, and the photoelectric encoder will have pulse signal output. Then the signal is disposed by the processor, and the deformation of the sample can be obtained.

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