Fatigue performance testing device and method for bolt bearing large load at low temperature

A technology of fatigue performance testing and testing equipment, which is applied in the direction of measuring equipment, applying stable tension/pressure to test material strength, strength characteristics, etc., can solve problems such as fatigue gaps, poor fatigue performance, and easy low-temperature cold and brittle bolt materials, etc. Achieve the effect of high feasibility and simple operation

Inactive Publication Date: 2013-09-04
PEKING UNIV
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Problems solved by technology

However, there are inevitably initial defects in bolted joints, which are prone to fatigue cracks under dynamic loads, especially in low temperature environments, where the bolt material is prone to low temperature cold and brittle, and the fatigue performance is even worse
In addition, although theoretical studies

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  • Fatigue performance testing device and method for bolt bearing large load at low temperature
  • Fatigue performance testing device and method for bolt bearing large load at low temperature

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[0018] The specific structure and implementation of the present invention will be further described below in conjunction with the drawings:

[0019] reference figure 1 , figure 2 As shown, a device for testing the fatigue performance of bolts under a large load in a low temperature environment includes a low temperature box 1 (in order to ensure the thermal insulation performance of the low temperature box, the box body adopts a cylindrical configuration), a guide column 2, and a rotating shaft device 3. Upper loading rod 4, test fixture 5, low temperature box door 8, liquid nitrogen input port 9, limit locking device 10, beam lifting device 11, electro-hydraulic servo system 12, beam 13, control panel 14, linear variable differential Transformer (LVDT) 15, nitrogen outlet 16, base 17, lower loading rod 18.

[0020] Among them, a lower loading rod 18 and four guide posts 2 are fixed on the base 17, and the other end of the guide post 2 is connected to the cross beam 13; the two e...

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Abstract

The invention relates to a fatigue performance testing device for a bolt bearing large load at a low temperature. The fatigue performance testing device comprises a cryogenic tank (1), guide columns (2), rotation shaft apparatuses (3), an upper loading pull rod (4), a test fixture (5), a cryogenic tank door (8), a liquid nitrogen inlet (9), a limit locking apparatus (10), a beam lifting apparatus (11), a loading apparatus (12), beams (13), a control panel (14), a displacement sensor (15), a nitrogen outlet (16), a base (17) and a lower loading pull rod (18). The fatigue performance testing device realizes test of the fatigue performance of bolt bearing the large load at the low temperature, can carry out low temperature dynamic low-cycle fatigue and programmed fatigue tests, and realizes fatigue performance parameter measurement and deformation behavior research when the bolt bears the large load at a condition close to a service environment. The fatigue performance testing device is simple in operations and has high practicability.

Description

technical field [0001] The invention relates to a device and method for testing the fatigue performance of bolts in a low-temperature environment and under large loads. The closed liquid nitrogen refrigeration is used, and the maximum dynamic load can reach 1500kN. Low-temperature dynamic low-cycle fatigue and program-controlled fatigue tests can be performed to realize low-temperature bolts. The characterization of dynamic and static mechanical properties, especially the low-temperature fatigue mechanical performance test of structures, belongs to the technical field of low-temperature mechanical testing. Background technique [0002] Cryogenic technology is an indispensable technology for many fields such as national defense construction, national economy and scientific research. With the rapid development of information, energy, machinery, aerospace and life sciences and other projects, as their related supporting technologies, cryogenic technology has also been obtained. ...

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Application Information

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IPC IPC(8): G01N3/10G01N3/02
Inventor 方岱宁曲兆亮庄庆伟裴永茂张如炳王戈
Owner PEKING UNIV
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