What are the factors that affect performance and accuracy of the tensile test

 

         1. The force sensor of the tensile testing machine. The quality of the sensor determines the accuracy of the testing machine. At present, the sensor for the tensile machine on the market generally uses an s-type sensor for small force values, and a spoke-type sensor for high force values. The inside of the sensor is generally a resistance strain gauge type. If the accuracy of the strain gauge is not high, or the anti-aging ability of the glue used to fix the strain gauge is not good, or the sensor material is not good, it will affect the accuracy and service life of the sensor.

 

　　 2. The ball screw that drives the sensor movement, because if there is a gap in the screw, the future test data will directly respond to the maximum deformation and elongation after the test. This leads to inaccuracy of the experimental results.

 

        3. The transmission system of the tensile machine. Some of the current tensile machine transmission systems on the market use reducers and some use ordinary belts. These two transmission methods have their own advantages and disadvantages. The main disadvantages: the former requires regular lubrication, while the latter is It cannot be guaranteed that the synchronization of the transmission will affect the test results.

 

         4. The power source (motor) of the tensile testing machine is also called a motor. At present, some tensile machines on the market use ordinary three-phase motors or variable frequency motors. This kind of motor adopts analog signal control, inaccurate positioning, slow control response, and general adjustment. The speed range is small. If there is a high speed, the low speed is lost or if there is a low speed, the high speed is lost, and the speed control is not accurate, which greatly reduces the accuracy of the test.

 

         5. The measurement and control system of the tensile machine (that is, software and hardware). At present, most of the measurement and control systems of the tensile machine on the market use 8-bit single-chip microcomputer control, which has poor anti-interference ability and low sampling rate. If the converter resolution is low. Then the measurement result will not be accurate.

For more information, please visit us at: https://www.qinsun-lab.com/index.html
Or write email to us at: info@qinsun-lab.com