Operation and attention description of extensometer on universal testing machine

Universal testing machineIt has the test performance of a variety of test machines such as tensile testing machines and pressure testing machines. The following is an understanding of the operating steps and precautions of the extensometer in the universal testing machine.

1. Install the sample in the upper and lower chucks of the universal testing machine. When performing the elastic modulus test of the material, a certain initial load F0 can be applied to the sample (corresponding to 5% to 10% of the elastic deformation load). Then carefully install the extensometer on the sample to check whether the contact between the extensometer and the sample is appropriate and whether the dial pointer rotates flexibly.

2. Adjust the extensometer gauge distance according to the actual needs of the measured sample size. Make the gauge of the extensometer equal to the gauge required for the measured sample.

3. After confirming that the test system is installed correctly, formal tests can be conducted.

4. Things to note

1) When the extensometer is installed on the sample, the longitudinal plane of symmetry of the instrument should be kept in the same plane as the axis of the sample as much as possible, and the gauge fork should not be significantly tilted left and right.

2) The actual deformation of the sample is not allowed to exceed the range of the extensometer, otherwise the extensometer will be damaged.

Universal testing machineThe extensometer on the test piece is an instrument used to measure the expansion and deformation of the tiny wires. It generally consists of three basic parts, namely the feeling of deformation; the transfer and enlargement of the majority; and the display part. There are many types of extensometers, and now we introduce two commonly used ones.