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A Vibration-Based Nondestructive Testing Method for Mechanical Parameters of I-beams

A technology of non-destructive testing and mechanical parameters, applied in the direction of applying repetitive force/pulsation force to test the strength of materials, measuring devices, scientific instruments, etc., can solve the problems of lack of applicable methods, and achieve the effect of avoiding damage

Active Publication Date: 2019-05-03
WENZHOU UNIVERSITY
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Problems solved by technology

However, previous studies were limited to simple standard sample structures (rectangular blocks and cylinders), aiming at the rapid identification of mechanical parameters of complex mechanical structures such as I-shaped beams under actual operating conditions, due to the lack of applicable methods and no report

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  • A Vibration-Based Nondestructive Testing Method for Mechanical Parameters of I-beams
  • A Vibration-Based Nondestructive Testing Method for Mechanical Parameters of I-beams
  • A Vibration-Based Nondestructive Testing Method for Mechanical Parameters of I-beams

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Embodiment Construction

[0025] Embodiments of the present invention will be further described below in conjunction with accompanying drawings:

[0026] The invention includes obtaining the empirical calculation formulas for the elastic modulus and shear modulus of the I-shaped beam pulse excitation detection through the finite element analysis and the response surface analysis method, and establishing the elastic modulus, the shear modulus and the geometric dimensions of the I-shaped beam and bending frequency, the I-beam (section shape such as figure 1Shown) the time-domain vibration signals under two vibration states of bending and shearing, the time-domain vibration signals are processed by fast Fourier transform (FFT), and the vibration spectrum diagrams of the time-domain vibration signals in the frequency domain are obtained, respectively Extract the first-order bending resonance frequency f of the time-domain vibration signal f and the first shear resonance frequency f t , and then take the ...

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Abstract

The invention relates to a vibration based I-beam mechanical parameter nondestructive testing method. The corresponding relations between the elasticity modulus and the shear modulus and the geometric dimension, the bend frequency and the shear modulus of an I-beam are established through the empirical formula. Finally, the measured first-stage flexural resonance frequency ff and first-stage shear resonance frequency ft and the geometric dimension of the I-beam are taken as an input of the empirical formula, and the dynamic elasticity modulus E and the dynamic shear modulus G of the I-beam are obtained through calculation. The provided I-beam mechanical parameter nondestructive testing method overcomes the limit that an engineering material needs to be made into a standard sample when the mechanical parameter of the material is tested, overcomes the influences of the machining process on the mechanical parameter of the material, simplifies the testing steps of the traditional testing method and the damage on the structure in the testing process, and is suitable for the practical application condition of the I-beam; the flexural resonance frequency and the shear resonance frequency of the I-beam are recognized, and the dynamic mechanical parameter of the I-beam is efficiently, accurately and nondestructively tested.

Description

technical field [0001] The invention belongs to the technical field of nondestructive testing, and relates to a vibration-based nondestructive testing method for the mechanical parameters of an I-beam. Background technique [0002] At present, with the rapid development of the country's manufacturing industry, the society's demand for mechanical equipment is expanding day by day. In the process of engineering application, the requirements for the stability and reliability of mechanical structures are getting higher and higher. As far as the mechanical structure is concerned, due to the unstable working conditions, the mechanical structure bears a large impact load and random excitation, and is prone to damage and failure caused by fatigue damage. Therefore, it is particularly important to carry out systematic digital simulation in advance to realize the evaluation of the stability of the mechanical structure and the prediction of the service life, which will greatly improve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/34
CPCG01N3/34G01N2203/0039
Inventor 向家伟宋文磊钟永腾汤何胜
Owner WENZHOU UNIVERSITY
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