Novel non-contact electromagnetic acoustic emission signal excitation experimental device

Abstract

The invention belongs to the technical field of nondestructive testing, and discloses a novel non-contact electromagnetic acoustic emission signal excitation experimental device. The novel non-contactelectromagnetic acoustic emission signal excitation experimental device is provided with a signal processing module used for data analysis and calculation, an acoustic emission signal acquisition system connected with the signal processing module and used for detecting weak electromagnetic acoustic emission signals and a gauss meter connected with the signal processing module and used for detecting magnetic field intensity. The acoustic emission signal acquisition system is connected to sensors fixed to the four corners of a conductive defect material plate by an amplifier, the gauss meter isconnected with a hall probe which is arranged between a group of parallel corresponding electromagnets, and the electromagnets are connected with a program-controlled current source through a wire. The problems of low reliability, poor stability, contact with a material to be detected, damage to the material to be detected and other shortcomings of an acoustic emission signal acquisition method currently used for defect detection are solved.

Description

technical field [0001] The invention belongs to the technical field of non-destructive testing, and in particular relates to a novel non-contact electromagnetic acoustic emission signal excitation experimental device. Background technique [0002] At present, metal alloy materials are widely used in construction, aviation, railway, automobile, subway and many other industries because of their high tensile strength, good fatigue strength, excellent welding characteristics, good wear resistance, corrosion resistance, and many other advantages. middle. In modern society, various metal structures are becoming more and more complex and large-scale, and any small defect in any component will have an incalculable impact on the entire structure, so it is necessary for the performance of various workpieces to meet higher safety standards. Therefore, before various metal structures are officially used, it is very necessary to detect defects through technical means. When the electrom...

AI Technical Summary

Problems solved by technology

However, the load will cause irreversible damage to the tested specimen, and there are still great difficulties in applying stress to the entirety of large components

At the same time, during the propagation of the acoustic emission signal, the signal is distorted due to the noise interference signal integrated into the stress-loaded equipment, and the continuous scattering and reflection of the signal at the material boundary, thereby reducing the true reliability of the signal.

This leads to problems such as low reliability, poor stability, and damage to the measured material of the collected signal.

[0003] To sum up, the problems existing in the existing technology are: the current acoustic emission signal acquisition method used in defect detection has low reliability, poor stability, contact with the tested material, and damage to the tested material.

[0004] Metal materials have the advantages of high tensile strength, corrosion resistance, and good welding performance, so they are widely used in all walks of life. Due to the imprecise or negligent production process, it is likely to cause tiny defects, cracks, and even some defective materials inside the material. The external and complete materials are the same, and various metal structures are becoming more and more complex and large, making it impossible for us to directly identify defects with the naked eye, which makes it difficult to detect complex structural defects

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