Device and method for detecting damage to composite by aid of Lamb guide waves

Abstract

The invention discloses a device and a method for detecting damage to a composite by the aid of Lamb guide waves. The device comprises a composite plate, multiple PZT sensors, an arbitrary wave generator, a high voltage amplifier, a data acquisition unit and a computer, wherein the computer is used for acquiring and calculating exciting signals sensed by the PZT sensors and corresponding signals sent by the PZT sensors, range envelope is performed on Lamb response signals of the composite plate in a healthy state and Lamb response signals of the composite plate in a damage state, subtraction is performed, damage signals generated after the Lamb waves are reflected and scattered through a round hole (the round hole is equivalent to the damage position of the composite plate) are obtained and subjected to superposition, influence of random errors can be eliminated, the amplitude of the damage signals is increased, the accuracy and the reliability of a measuring result are greatly increased, and the deviation between the measured damage distance and the actual distance can be kept within 7%.

Description

technical field [0001] The invention relates to the field of composite material damage detection, in particular to a method for damage detection of composite materials using Lamb guided waves. Background technique [0002] Composite materials have the characteristics of high specific strength, high specific stiffness, corrosion resistance, fatigue resistance and excellent thermal insulation and sound insulation properties, and have been widely used in different fields; however, composite parts are easy to manufacture and use. Problems such as debonding, delamination and cracks occur; in order to meet the requirements of high quality, high reliability and long life of industrial products, composite parts must be tested in all directions, especially for crack damage that cannot be observed by the naked eye. important; [0003] The current testing method is ultrasonic nondestructive testing. Ultrasonic nondestructive testing is widely used in the quality testing stage of the m...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for damage detection of composite materials using Lamb guided waves, improve the detection efficiency of damage path detection of composite materials and the reliability of detection results, so as to solve the problem of damage path of composite materials by traditional detection methods. The detection efficiency of the detection is low, or even the problem that cannot be detected

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