How to select electronic tensile testing machine
What kind of rubber tensile testing machine should we choose to do rubber tensile test?
1、 First of all, we should understand: according to relevant standards, what data do we need? Generally speaking, the following parameters or seven parameters need to be obtained in the tensile test of rubber https://www.lyxyantech.com
1. The value of strong force (tensile strength) during the tensile fracture of the sample;
2. Force value (breaking strength) when the sample is broken;
3. Stress value corresponding to yield point (tensile stress at yield point);
4. Force value when the sample is stretched to a given elongation (constant elongation stress);
5. Elongation when the sample is stretched to a given stress (constant stress elongation);
6. Elongation corresponding to yield point (elongation at yield point);
7. Elongation at break of sample (elongation at break).
2、 According to the requirements of the above measured parameters. There are two items of data to be tracked in the process of rubber tensile test: tensile force value and gauge distance change.
Therefore, the rubber tensile testing machine used to test the tensile properties of rubber must meet the following four requirements:
1. Large stroke. https://www.lyxyantech.com
Due to the large deformation of rubber during stretching, especially latex products, the elongation may be as high as more than 1000%. Therefore, before the rubber sample breaks, it must be ensured that the gripper has enough travel.
2. High precision and high frequency data acquisition. https://www.lyxyantech.com
The tensile rubber does not need a large force, and the tensile force measurement range does not need to be large, so the accuracy of the force value is high. General requirements: dynamometer, tension machine, vulcanizer
It can calculate the force value with more than two decimal places. In addition, because testing the tensile properties of rubber requires several tensile values in the tensile process, and the tensile test can not be repeated, the real-time and accurate recording of the tensile force value of each test section plays a very important role in the success or failure of the test.
3. Accurate gauge distance measuring and recording device. https://www.lyxyantech.com
The measurement of sample gauge distance is an important data for calculating rubber elongation. Therefore, in rubber tensile test, the tensile testing machine must accurately measure the strain of the sample and record it immediately.
4. A device that can accurately describe the stress-strain curve. https://www.lyxyantech.com
There is a close relationship between the tensile value and the gauge distance in the tensile sample. For example, the constant tensile stress of the sample needs to measure the force value when the sample is stretched to a given elongation, while the constant stress needs to measure the gauge distance when the sample is stretched to a given stress. After the test, the accurate stress-strain curve can reproduce the test process and clearly reflect the value of each test section, which is convenient to calculate the items required by the test