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 enterprise standards and industry standards. These standards generally have strict 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 the fixture according to the shape and material of the specimen.

2. The fixture itself has no fixed structure. In this respect, the fixture and the host are obviously different. Hosts are similar in both domestic and foreign countries, and the difference between foreign and domestic fixtures is very large, and there are big differences between different companies. This depends mainly on the overall level of the company and the accumulation of experience of the designers. All of the fixtures for new materials and special materials have a certain gap between domestic and foreign levels.

3, I know that the fixture itself belongs to a locking mechanism, and the mechanical locking structure respectively: crepe, bevel, eccentric, lever, etc., and the fixture is a combination of these structures. There is no fixed pattern in the structure of the fixture for the test machine, and the structure differs greatly depending on the size of the sample and the test force. If the fixture is divided according to the structure, it can be divided into wedge-shaped fixture, clamp-type fixture, winding-type fixture, eccentric-type fixture finger, lever-type fixture, shoulder-type fixture, bolt-type fixture, 90° peeling type fixture, etc. The knots of the fixtures have their own advantages and disadvantages. In the experimental materials, the type of fixtures should be selected according to the items to be tested.