What matters should be paid attention to when the tensile testing machine is installed in the fixture?

What matters should be paid attention to when the tensile testing machine is installed in the fixture?

The tensile testing machine is a multifunctional tensile testing machine, which is widely used in machinery, electronics, universities, research institutes and other industries in China. With the advancement of technology, it is increasingly used for tensile test, compression test, and bending test of various metal materials, non-metal materials, composite materials such as metal, plastic, rubber, film, fiber, glass fiber, paper, textile, etc. , Stress relaxation or creep test and tensile, peeling and welding strength test of mechanical parts and electronic parts. The clamp is an indispensable part of the tensile testing machine. The tensile testing machine clamps the sample through the clamp, and judges whether the material is qualified and reaches the predetermined performance index through the force application device, the force value display device and the record. Unable to judge. The clamp is a part of the tensile testing machine that changes frequently according to the change of the material sample. Different materials require different clamps. The clamp is an important factor in whether the test can be carried out smoothly and the accuracy of the test results. Because the tensile testing machine can measure the performance of a variety of products, and the structure and appearance of various samples are different, the particularity of the fixture structure is formed. Therefore, the proper and correct use of the fixture is conducive to the smooth progress of the test. In the actual application of the tensile testing machine, some requirements for the installation of the fixture are explained: 1. The correct clamping of the sample is very important for the test, which directly affects the success or failure of the test and the accuracy of the test data; 2. For rectangular specimens and brittle specimens In other words, the clamping is more important; 3. When clamping, install the sample as parallel as possible before and after the parallel, and then stretch it; 4. In the steel wire winding fixture, there can be no line pressure, which will Causes local stress concentration, which often breaks from the pressure line, resulting in a difference in the breaking point; 5. For the wedge fixture, the left and right centering of the sample is guaranteed by the fixture, but it is easy to install diagonally before and after installation. During the stretching process, the stress on both sides of the sample is uneven, which may tear the sample or break point difference; 6. For lapped samples, the lapped surface should pass through the force center of the sensor. To sum up, when we install the fixture, the general principle is to make the force line of the sample (or finished product or semi-finished product) coincide with the force line of the sensor as much as possible, and for the user, every time Before one-step operation, you should carefully read the relevant product manuals and operate in strict accordance with the relevant operations, so that you can better operate the tensile testing machine.

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