No-reference SH wave guide method used for flat plate thinning defect quantitative detection

Abstract

The invention discloses a no-reference SH wave guide method used for flat plate thinning defect quantitative detection. Defect reconstruction is conducted on a flat plate by means of no-reference SH wave guide, and the specific position and shape of a defect are given. The method includes the steps that mode separation is conducted on a total field, and a reflection coefficient of a required SH wave guide mode is obtained; a green function in the no-defect flat plate is solved, and a approximate solution of a far field is obtained; a boundary integral equation is solved, and the shape of the defect in the flat plate is reconstructed in a no-reference mode. The method relates to a quantitative detection technology, people do not need to refer to the approximate position of the defect in advance, a defect expression is directly induced theoretically, a whole component can be detected at a time, an efficient and precise scheme is provided for ultrasonic wave guide quantitative detection, the method has important application value in engineering, and a whole structure can be detected at a time. Detection can be conducted without removing coating and insulating layers, and complex rotating and walking devices are not needed. Defect sensitivity and precision are high, energy consumption is low, and the method is economical.

Description

technical field [0001] The invention belongs to the technical field of non-destructive testing, and in particular relates to a non-reference SH guided wave method for quantitative detection of plate thinning defects. Background technique [0002] With the development of science and technology, the requirements for defect detection and evaluation in the machinery, construction and aerospace industries are getting higher and higher. It is no longer only satisfied with the detection of defect positions and fuzzy shapes, but needs to quantitatively give the exact position and details of defects. shape. [0003] Conventional non-destructive testing and evaluation methods in the industry include magnetic particle testing, radiographic testing, eddy current testing, ultrasonic testing, etc. Among them, ultrasonic non-destructive testing is a widely used testing method. Due to its high frequency and short wavelength, ultrasonic waves can interact with tiny features in structures su...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a non-reference SH guided wave method for the quantitative detection of flat plate thinning defects, aiming to solve the problem that the exact position and specific shape of the defect cannot be quantitatively given in the current defect detection and evaluation

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