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

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...

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