Cylinder bar separated pneumatic direct dynamic tensile test device

Abstract

The invention discloses a cylinder-rod separation type pneumatic direct dynamic stretching test device, the input rod (3) passes through the input rod sleeve (9); the rear part of the input rod sleeve (9) is sealed and sleeved on the input rod ( 3), the front part is sleeved on the bullet (2) on the input rod (3); the inner cavity in the middle of the input rod sleeve (9) is connected with the bullet launching cylinder (1) through the air pipe (21), realizing the cylinder , The rod is separated. The device has simple structure, convenient debugging and use, low manufacturing and maintenance costs, and is stable and reliable.

Description

technical field [0001] The invention relates to the field of material performance testing, in particular to the field of material dynamic mechanical performance testing. Background technique [0002] Dynamic mechanical properties of materials, including compression and tension mechanical properties. To test the dynamic compression mechanical properties of materials, the Hopkinson compression bar test device is usually used. Its structure and principle see figure 1 . The tested object 4 is fixed between the input rod 3 and the output rod 5 . The instantaneous high-pressure gas fired by the pneumatic bullet launching cylinder 1 pushes the bullet 2 to hit the input rod 3, and the incident compressive stress wave is generated in the input rod 3, and the strain ε is recorded by the strain gauge 7 i . After the stress wave compresses the tested piece 4, a reflected stress wave and a transmitted stress wave are generated, which are respectively recorded by the input rod strain...

AI Technical Summary

Problems solved by technology

[0009] However, since the input rod 3 of the existing pneumatic direct tension test device is nested in the pneumatic bullet launching cylinder 1 ', it becomes an integrated structure

The pneumatic bullet launching cylinder 1' is a high-pressure cylinder. After the input rod 3 is penetrated, the space of the pneumatic and control structure in the cylinder is narrow, the layout is difficult, the structure becomes very complicated, and it is difficult to manufacture and debug.

And after the input rod is penetrated, the sealing of the high-pressure cylinder is also very difficult and the structure is complicated, which makes the manufacturing and maintenance costs of the whole device high and the reliability low

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