Ultrasonic guided-wave evaluation method for debonding of steel-glass fiber reinforced plastic composite boards

A technology of composite sheet and ultrasonic guided wave, which is applied in the direction of using sound wave/ultrasonic wave/infrasonic wave to analyze solids, etc. It can solve the problems of inability to detect internal hidden defects and achieve effective detection and evaluation

Active Publication Date: 2015-12-16
NANCHANG HANGKONG UNIVERSITY
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Problems solved by technology

However, this method can only be used to detect defects whose openings are exposed on the surface of the workpiece, and cannot detect internal hidden defects

Method used

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  • Ultrasonic guided-wave evaluation method for debonding of steel-glass fiber reinforced plastic composite boards
  • Ultrasonic guided-wave evaluation method for debonding of steel-glass fiber reinforced plastic composite boards
  • Ultrasonic guided-wave evaluation method for debonding of steel-glass fiber reinforced plastic composite boards

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Embodiment Construction

[0024] The technical scheme adopted by the present invention is as follows: a steel-glass reinforced plastic composite sheet debonding ultrasonic guided wave evaluation method, which is characterized in that the material bonding defect can be detected without destroying the structural integrity of the composite sheet, and the defect and non-defective places can be detected. Cross-correlation processing is performed on the ultrasonic guided wave signals, and the structural quality status is evaluated by calculating the cross-correlation coefficient. Due to the special structure of this kind of composite sheet, it is made of 0.5-1mm steel plate and 2.5mm glass fiber reinforced plastic. The propagation process of ultrasonic guided waves in it is very complicated, with many modes, and the sound attenuation of glass fiber reinforced plastic is very large. The propagated guided wave signal is very weak. Even if there is detection information propagated by the glass fiber reinforced pl...

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Abstract

The invention discloses an ultrasonic guided-wave evaluation method for debonding of steel-glass fiber reinforced plastic composite boards. Two 500-KHz ultrasonic guided-wave probes in the fixed distance are used for exciting and receiving guided-wave detection signals at certain incident angles with a direct contact method, board structure detection information is acquired, a cross-correlation coefficient is calculated through cross-correlation processing of healthy ultrasonic guided-wave detection signals in well debonding positions, the structural debonding size can be evaluated quantitatively according to the cross-correlation coefficient, and structural quality conditions of the composite boards are effectively detected and evaluated. The method has the advantages as follows: the data processing and evaluating method is further applicable to debonding quality detection of composite boards adopting other structures and has the important actual application value.

Description

Technical field [0001] The invention relates to the use of a high-power ultrasonic guided wave detection system to realize the effective detection and evaluation of the structural quality of steel-glass reinforced plastic composite sheet by ultrasonic guided waves, and is a new composite material structural quality detection and evaluation method belonging to the scope of ultrasonic nondestructive testing. It involves an ultrasonic guided wave evaluation method for debonding steel-glass reinforced plastic composite plates. Background technique [0002] In the field of aerospace, bonding structures are more and more widely used due to their specific strength, high specific modulus, strong fatigue resistance, low cost, shock absorption and other significant advantages. As a representative of the metal-non-metal bonding structure, the steel-glass fiber reinforced plastic bonding structure often has delamination and debonding at the bonding interface due to many practical reasons suc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04
Inventor 李秋锋陈建娟张震曾亮陈果习璐颖
Owner NANCHANG HANGKONG UNIVERSITY
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