Bolt fastening axial force ultrasonic detection method based on differential method

A fastening axial force and ultrasonic testing technology, applied in force/torque/work measuring instruments, measuring torque/torsion force during tightening, measuring devices, etc., can solve poor adaptability, high cost, and unfavorable bolt fastening axial force Ultrasonic testing method engineering application and other issues

Inactive Publication Date: 2020-06-19
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Application Information

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Problems solved by technology

However, the existing methods generally obtain the ultrasonic detection coefficients of bolts with different specifications and different connection states through a large number of calibration experiments.
Its high cost and poor adaptability are not conducive to the engineering application of the ultrasonic testing method for bolt fastening axial force

Method used

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  • Bolt fastening axial force ultrasonic detection method based on differential method
  • Bolt fastening axial force ultrasonic detection method based on differential method
  • Bolt fastening axial force ultrasonic detection method based on differential method

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Embodiment Construction

[0074] The specific embodiment of the present invention is described in detail below:

[0075] The invention provides a method for ultrasonic detection of bolt fastening axial force based on a differential method, the method described in the method, such as figure 1 Shown, its implementation steps are as follows:

[0076] Step 1. Establish the principle model of bolt fastening axial force ultrasonic testing

[0077] Based on the finite element theory and acoustic elasticity theory, the mathematical relationship between the bolt fastening axial force and the ultrasonic propagation time difference is established, and the ultrasonic detection principle model of the bolt fastening axial force is established. The specific methods are as follows:

[0078] According to the theory of acoustoelasticity, when an isotropic solid material is subjected to stress in one direction, the sound velocity of ultrasonic longitudinal waves propagating along the stress direction can be deduced as: ...

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Abstract

The invention provides a bolt fastening axial force ultrasonic detection method based on a differential method, which comprises the following steps: (1) establishing a mathematical relationship between bolt fastening axial force and ultrasonic propagation time difference, and establishing a bolt fastening axial force ultrasonic detection principle model; (2) establishing a finite element model ofthe bolt connection structure, carrying out static simulation, obtaining axial stress data on the central axis of the bolt, and calculating to obtain a bolt shape factor; (3) carrying out a loading test in combination with the critical refraction longitudinal wave, and carrying out linear fitting on the loading stress and the measured time difference to obtain the acoustic elastic coefficient of the bolt material; and (4) substituting the bolt shape factor, the acoustic elastic coefficient and other bolt material attribute parameters into the detection principle model, and determining the boltfastening axial force ultrasonic detection coefficient. According to the method, the adaptability of a detection model is improved, and ultrasonic detection coefficients of the bolt under different specifications and different connection states are obtained; the method is low in cost and good in adaptability, and accurate and quick determination of ultrasonic detection parameters is achieved.

Description

technical field [0001] The invention proposes an ultrasonic detection method of bolt fastening axial force based on a differential method. The method described in the method is suitable for the non-destructive measurement of bolt fastening axial force by ultrasonic acoustic time method, and belongs to the technical field of bolt fastening detection technology. Background technique [0002] Bolted connections are widely used in armored vehicles, aerospace, special machinery and other fields due to their advantages such as simple assembly, convenient disassembly, high efficiency, low cost, and good adaptability. For different types of bolts, in order to ensure the quality and reliability of mechanical equipment, it is necessary to apply appropriate pre-tightening force to them. Excessive pre-tightening force will easily cause the bolt to break and fail under the action of axial load, while insufficient pre-tightening force will make it difficult to achieve the required clampin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L5/24G06F30/23G06F119/14
CPCG01L5/246
Inventor 潘勤学潘瑞鹏邵唱常梅乐徐晓宇郑崑琳
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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