Non-destructive testing method and system based on multi-channel surface wave analysis of piezoelectric ceramics

Abstract

The invention discloses a non-destructive detecting method and system based on multi-channel surface wave analysis of piezoelectric ceramics. The method comprises the steps that a signal generator iscontrolled to generate a sinusoidal pulse voltage signal, and the sinusoidal pulse voltage signal is amplified through a voltage amplifier; the amplified sinusoidal pulse voltage signal is connected with the driving end of a piezoelectric ceramic piece; the piezoelectric ceramic piece generates ultrasonic vibration under the inverse piezoelectric effect, and the ultrasonic vibration is propagatedin the form of stress wave in a carbon fiber reinforced composite material-concrete composite member; the functional element array of the piezoelectric ceramic piece on a receiving end generates timedomain voltage signals of different peaks under the action of the piezoelectric ceramic positive piezoelectric effect; the time domain voltage signals of different channels are acquired by a multi-channel data acquisition device; and according to a multi-channel surface wave analysis method, data analysis is carried out on the acquired time domain voltage signals to complete damage detection. Themethod has low detection cost and high recognition accuracy for interface peeling defects, and is convenient for popularization and application in engineering practice.

Description

technical field [0001] The invention relates to the technical field of defect detection, in particular to a nondestructive detection method and system based on multi-channel surface wave analysis of piezoelectric ceramics. Background technique [0002] Relevant mature technologies that can realize interfacial delamination defects in carbon fiber reinforced composite material-concrete composite members (CFRP-concrete composite members) mainly include wave method, impedance method, electromagnetic wave method, percussion method, etc. The wave method is mainly divided into the body wave method and the surface wave method. The body wave method has a small detection range, and generally requires pre-embedded sensors to compensate for the rapid attenuation of stress waves in concrete. Although the surface wave method solves the problem of sensor embedding in the bulk wave method, its detection accuracy is low and the detection range is relatively small. The detection accuracy of ...

AI Technical Summary

Problems solved by technology

Although the surface wave method solves the problem of sensor embedding in the body wave method, its detection accuracy is low and the detection range is relatively small

The detection accuracy of the electromagnetic wave method is high, but the detection cost is expensive

The detection cost of the knocking method is low, but the detection results are highly dependent on the experience of the detection personnel, and generally only used as an auxiliary detection method

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