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Bolt pure bending fatigue test tool and system

A fatigue test, pure bending technology, applied in the direction of using a stable bending force to test the strength of materials, measuring devices, and using repeated force/pulse force to test the strength of materials, etc., can solve the problem that the test structure is only suitable for specific test institutions and cannot be Pure bending loading and other problems, to achieve the effect of easy operation

Inactive Publication Date: 2019-08-09
BEIJING JIAOTONG UNIV
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  • Claims
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Problems solved by technology

[0007] In view of the deficiencies in the prior art, the object of the present invention is to provide a bolt pure bending fatigue test tool and system, which can be adapted to the MTS fatigue testing machine, and solve the problem that the existing testing structure is only applicable to a specific testing mechanism and cannot realize pure bending fatigue testing. bending loading problem

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  • Bolt pure bending fatigue test tool and system
  • Bolt pure bending fatigue test tool and system
  • Bolt pure bending fatigue test tool and system

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Embodiment Construction

[0034] The preferred embodiment of the present invention will be illustrated in detail below in conjunction with the accompanying drawings, but the preferred embodiment cannot be used to limit the protection scope of the present invention.

[0035] Such as figure 2 , image 3 , Figure 4 , Figure 5 As shown, the present invention provides a kind of bolt pure bending fatigue test fixture, comprises:

[0036] The upper plate 1 and the lower plate 2 are parallel to each other, one end of the upper plate 1 is the positioning end, the other end is the pressure end, one end of the lower plate 2 is the positioning end, and the other end is the fixed end, the positioning end of the upper plate 1 is connected to the lower The positioning end of the plate 2 is respectively provided with an upper positioning hole 11 and a lower positioning hole 21 corresponding to the position, allowing the test bolt 3 to pass through and position;

[0037] Two groove blocks 22 with the same shape ...

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Abstract

The invention provides a bolt pure bending fatigue test tool and system. The test tool comprises an upper plate and a lower plate which are parallel to each other, and two groove blocks and two protrusions which are engaged with each other, wherein the positioning end of the upper plate and the positioning end of the lower plate are provided with an upper positioning hole and a lower positioning hole with corresponding positions for enabling a test bolt to pass through and to be positioned; and the two groove blocks and the two protrusions are fixed or integrally formed on the lower plate andthe upper plate respectively and located at two sides of the upper positioning hole and the lower positioning hole, and thus, the connection line between two engaged points is vertical to the centralaxis of the test bolt. The system is formed when longitudinal test signals of an MTS testing machine are received at the other end of the upper plate. Through adopting the above structure, bolt bending fatigue strength test can be carried out on a general MTS fatigue testing machine.

Description

technical field [0001] The invention relates to a fixture and a system for testing the fatigue strength of bolts under pure bending load, in particular to a fixture and a system for testing the bending fatigue strength of high-strength bolts under pretightening force. Background technique [0002] Bolt connection is a widely used connection form in mechanical equipment. Among them, high-strength bolts are the most common and important connection method in automobile, aviation, metallurgical equipment, and steel structure industries. In actual engineering, high-strength bolts must bear various external repeated loads on the basis of high pre-tightening force, such as tension and compression, bending, shearing and impact loads, or bear the above-mentioned loads repeatedly effect. In these load types, the occurrence of bending loads can be catastrophic for the bolt due to the characteristics of the bolt geometry. As for the fatigue strength of bolts under pure bending load, d...

Claims

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Application Information

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IPC IPC(8): G01N3/20G01N3/32G01N3/04
CPCG01N3/04G01N3/20G01N3/32G01N2203/0023G01N2203/0073G01N2203/0435
Inventor 王曦郑琪潘越李强
Owner BEIJING JIAOTONG UNIV
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