The requirements for the fixture structure of the universal material testing machine

What are the requirements for the fixture structure of the universal material testing machine?

The clamps of the universal material testing machine have different forms, and the clamps play a very important role in the testing process of the testing machine and are an indispensable part of the testing machine. So what requirements does the universal material testing machine have on the structure of the fixture? Let us continue to look down.

1. The design of the fixture is mainly based on the test standard of the material and the shape and material of the sample. The test standards mentioned here mainly refer to ISO, ASTM, DIN, GB, BS, JIS, etc., as well as corporate standards and industry standards. These standards generally have strict requirements on sample preparation and test methods. It is stipulated that we can design different fixtures according to different samples and test methods. For fixtures used for special specimens, it is necessary to design fixtures according to the shape and material of the specimen.
2. The fixture itself has no fixed structure. In this respect, there is a clear difference between the fixture and the host. The host machine is similar whether it is domestic or foreign, but the difference between foreign and domestic fixtures is very big, and there are also big differences between different companies. This mainly depends on the overall level of the company and the accumulation of experience of the designers. For some new materials and special materials, there is a certain gap between domestic and foreign standards.
3. I all know that the fixture itself belongs to a locking mechanism, and the mechanical locking structures are: ridges, inclined planes, eccentric wheels, levers, etc., and the fixture is a combination of these structures. There is no fixed pattern in the structure of the fixture for the testing machine. According to different samples and the size of the test force, the structure is very different. If the clamps are divided by structure, they can be divided into wedge clamps, pair clamps, winding clamps, eccentric clamps, lever clamps, shoulder clamps, bolt clamps, 90° peeling clamps, etc. Of course these The knot of the fixture has its own advantages and disadvantages. When experimenting with materials, the type of fixture should be selected according to the item to be tested.