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Method for ultrasonically and synchronously measuring axial force and shearing force of bolt

A technology of synchronous measurement and shearing force, applied in the direction of measuring torque/torsion force, measuring device, force/torque/power measuring instrument, etc. during tightening, to achieve low cost, improve calibration accuracy, and improve measurement accuracy.

Active Publication Date: 2021-01-05
四川优安协创科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] There is no method for synchronously measuring bolt axial force and shear force in existing technical solutions

Method used

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  • Method for ultrasonically and synchronously measuring axial force and shearing force of bolt
  • Method for ultrasonically and synchronously measuring axial force and shearing force of bolt
  • Method for ultrasonically and synchronously measuring axial force and shearing force of bolt

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Embodiment Construction

[0041] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0042] A method for ultrasonic simultaneous measurement of bolt axial force and shear force, comprising the following steps:

[0043] Step 1: Paste piezoelectric chips on both ends of the bolt to be tested. The piezoelectric chips on each end face are two semicircular concentric piezoelectric chips; the piezoelectric chips on different end faces have the same structure, coaxial and same direction, and the bolt head The upper side of the tail is piezoelectric wafer A, the lower side is piezoelectric wafer B, the upper side of the tail is piezoelectric wafer a, and the lower side is piezoelectric wafer b.

[0044] Before the measurement, the bolts to be tested are polished to meet the surface requirement that the surface roughness is less than 3.2 μm. Paste piezoelectric wafers on the two ends of the bolt, use bolt fastening glue to paste two id...

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Abstract

The invention discloses a method for ultrasonically and synchronously measuring axial force and shearing force of a bolt. The method comprises the steps of 1, adhering piezoelectric wafers to two endsurfaces of a bolt to be measured; 2, calibrating an axial stress coefficient Kx and a radial stress coefficient Ky of the bolt; 3, obtaining the difference [delta]t1 which is equal to t1-t0x betweenthe time t1 in the service state and the time t0x in the axial zero stress; 4, calculating an axial force F1 which is equal to Kx*[delta] t1 according to the axial stress coefficient Kx; 5, obtainingthe difference [delta]t' which is equal to t'-t0 between the time t' under the service state and the time t0 under the zero stress; 6, obtaining the sound time difference [delta]t2 which is equal to [delta]t'-[delta]t1=(t'-t0)-(t1-t0x) caused by the shearing force of the bolt in the service state; and 7, according to the radial stress coefficient Ky, calculating the shearing force F2 which is equal to Ky*[delta]t2. By setting excitation and receiving directions and positions of different piezoelectric wafers, the axial force and the shearing force of the bolt to be measured in the service state are measured respectively, and the measurement precision of the bolt stress is improved; and the axial force and the shearing force can be measured simultaneously.

Description

technical field [0001] The invention relates to the technical field of ultrasonic nondestructive testing, in particular to a method for ultrasonically synchronously measuring the axial force and shear force of bolts. Background technique [0002] As an important connection method in engineering production, bolt connection transmits nodal force to support the structure through the friction between the contact surface and the thread, and can provide sufficient connection force. It has the advantages of simple structure, convenient loading and unloading, high efficiency and low cost, and is widely used in important equipment such as aerospace, traffic bridges, building structures, and chemical products. [0003] In actual engineering construction, inappropriate bolt axial force will damage the quality of the bolt connection pair, and directly affect the integrity and reliability of the equipment. Therefore, accurate, intuitive and convenient measurement of bolt stress plays a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L5/24G01L5/173
CPCG01L5/246G01L5/173
Inventor 邱菲菲苟国庆陈兵高唯于金朋朱忠尹张曦陈佳胡彧孜
Owner 四川优安协创科技有限公司
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