Ultrasonic guided wave detection technology for positioning defects of composite laminated plate

Abstract

The invention provides a nondestructive test method for positioning defects of a composite laminated plate. The method is characterized in that a multi-probe detection mode is adopted to accurately and conveniently perform two-dimensional positioning on interfacial defects of the composite laminated plate. The method comprises the following steps: (a) arranging four sensors in a square at a certain spacing on the surface of the composite laminated plate; (b) taking each sensor in the square arrangement as an excitation sensor sequentially and two sensors adjacent to the excitation sensors as receiver sensors, thus forming a multiplex defect positioning system; (c) performing cluster analysis on position information of a plurality of groups of the defects, keeping effective data and eliminating information with obvious deviation; and (d) calculating to obtain position information of the defects based on an elliptic positioning method according to time delay, and further reducing errors by an averaging method for centering, thus performing accurate two-dimensional positioning on the defects of the composite laminated plate.

Description

Technical field [0001] The invention relates to a defect location non-destructive detection method of a composite material laminated board. Background technique [0002] For the defects of composite laminates, the acoustic emission detection method is usually used at present. Acoustic emission (AE) refers to the phenomenon that the material locally emits sound waves due to the rapid release of energy. Because the sound emission signals come from defects, the sound emission signals of different defects are also different. The sound wave signals are collected by the receiving sensor and processed according to the signal. Characteristics, determine the location of the acoustic emission source. The advantage of acoustic emission detection technology is that it can realize dynamic and real-time detection, but when the sound wave is attenuated severely in the propagation path, the detection accuracy is difficult to guarantee. At the same time, it is a passive detection method, so its o...

AI Technical Summary

Problems solved by technology

[0004] In view of the technical problems existing in the existing detection and positioning methods, the purpose of the present invention is to provide a non-destructive testing method for defect positioning of composite material laminates, which can accurately and conveniently detect interlayer defects of composite material laminates by means of multi-probe detection. two-dimensional positioning

Images