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Test method for performance detection of bolt connection stage under transverse load

A lateral load, staged technology, applied in the testing of mechanical components, testing of machine/structural components, measuring devices, etc., can solve problems such as dispersion of bolt pre-tightening force

Inactive Publication Date: 2020-01-07
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used fastening methods will cause a certain degree of dispersion of the bolt pre-tightening force.

Method used

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  • Test method for performance detection of bolt connection stage under transverse load
  • Test method for performance detection of bolt connection stage under transverse load
  • Test method for performance detection of bolt connection stage under transverse load

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Experimental program
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Embodiment Construction

[0018] The method will be described in detail below in conjunction with the accompanying drawings.

[0019] A test method for performance detection of bolt connection stage under lateral load, the implementation steps of the method are as follows:

[0020] Step 1: Pre-tighten the bolted connection structure;

[0021] Pass the screw 8 through the pressure sensor 9, the upper test piece 2, the lower test piece 5, the gasket 3, and the nut 4 in sequence, connect the pressure sensor 9 to the data acquisition card 10 and the computer 7, and configure the relevant acquisition software. Select the appropriate pre-tightening tool and pre-tightening method to pre-tighten the bolted connection structure, and record the obtained bolt pre-tightening force F.

[0022] Step 2: Tensile test of bolted connection structure;

[0023] The pre-tightened bolted connection structure is placed on the material testing machine 1, wherein the upper connecting part 2 is clamped by the upper clamp of t...

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Abstract

The invention, which belongs to the field of mechanical design, discloses a test method for performance detection of a bolt connection stage under a transverse load. Testing equipment comprises a material testing machine, a bolt connection test piece, a pressure sensor, a data acquisition card and the like. According to the disclosed test method, a transverse load is applied to a bolt connection structure by the material testing machine, a force-displacement curve of a bolt pre-tightening force and a one-way tensile test process is recorded, and all stages of bolt connection in the transversesliding process are divided. With the provided testing equipment and test method, load and displacement threshold values of all stages of bolt connection transverse slippage under different pre-tightening forces are recorded and tangential characterization rigidity of the bolt connection is calculated. A pre-tightening force of a pre-tightened bolt is obtained by using the pressure sensor and multi-factor analysis of the bolt connection performance is carried out. In addition, performance detection and evaluation can be carried out on a specific bolt connection structure and an important basisand reference are provided for reliability evaluation and optimization design of bolt connection application.

Description

technical field [0001] The invention relates to a test method for performance detection of bolt connection stage under transverse load, belonging to the field of mechanical design. Background technique [0002] Bolt connection is widely used in various mechanical structures, and its connection quality will directly affect the overall performance of the mechanical structure. However, under the action of external load, the bolt pre-tightening force will gradually decrease, which will reduce the connection performance of the bolted connection structure. External loads are often divided into axial loads along the bolt axis and perpendicular to the axial direction of the bolts (transverse). Compared with axial loads of bolted connections, bolted connections are more likely to loosen under lateral loads, thus attracting more attention. Moreover, under the action of lateral load, the force-displacement curve of the bolted connection has nonlinear characteristics, so exploring the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M13/00
CPCG01M13/00
Inventor 刘志峰郑铭坡闫兴王宝恩徐文祥
Owner BEIJING UNIV OF TECH
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