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Tensile testing machine fixture selection criteria
Click:738 Release time:2017-03-13

Tensile testing machine fixture selection criteria from dongguan kunlun testing Instrument Co., Ltd.

First, the tensile test machine fixture has the characteristics:

 (1) Easy to hold, and can not have slippery phenomenon.

(2) During the test, the test break is good. Data discretization is small. (Ie, the sample is constantly jaw, jaw, parallel section or gauge distance

 (3) Whether the fixture is easy to use and safe.

二、Should pay attention to a few special cases:

1For the some deformation materials, deformation is too large, so is difficult to clamp and  fixture design is also a difficult point.

2For the test that need to do in high temperature environment, the requirements for fixture are high. Whats more, to meets the requirements of anti high temperature, no deformation and small volume, few factories can do that.

3Common fixture names are: universal fixture, wire tension fixture, rubber stretch fixture, spring tension and compression fixture, sewing thread special fixture, terminal fixture, etc.

Third, the last thing is to pay attention to the fixture material: material requirements must meet the following criteria:

1.        For the general metal and non - metallic samples, jaws of the jaws directly contact with the sample, so w generally use high - quality alloy structural steel, alloy high - carbon steel (or low - carbon steel), cold work die steel, etc. through appropriate Heat treatment process (quenching and tempering, carburizing and quenching, etc.) to increase its strength, wear resistance. Sometimes also in the jaw atlas special steel, or in the jaw surface spray steel sand and so on.

2.        For some small test fixture, contact with the sample surface with a sticky soft rubber and so on. (For example: plastic film, fiber yarn and other samples of the fixture clamping surface.)

3.      Clamps are generally made of high quality medium carbon steel, alloy structural steel, through the appropriate heat treatment process to increase its mechanical properties. Sometimes in order to reduce the weight of aluminum and other non-ferrous metals and special metals. Sometimes also used casting structure (cast steel, cast aluminum, etc.) testing machine