Method for ultrasonic distinguishing of R-region defect of composite material structure

A composite material and ultrasonic technology, applied in the analysis of materials, the use of sound waves/ultrasonic waves/infrasonic waves to analyze solids, and the use of sound waves/ultrasonic waves/infrasonic waves for material analysis, etc., can solve complex sound wave reflection signals, defect detection and misjudgment, and influence Quantitative analysis and other issues

Active Publication Date: 2017-04-26
AVIC BEIJING AERONAUTICAL MFG TECH RES INST +1
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Problems solved by technology

At present, defect discrimination is mainly based on the amplitude of the ultrasonic reflection signal from the R-zone of the composite material structure (i.e., the

Method used

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  • Method for ultrasonic distinguishing of R-region defect of composite material structure
  • Method for ultrasonic distinguishing of R-region defect of composite material structure
  • Method for ultrasonic distinguishing of R-region defect of composite material structure

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Embodiment

[0193] Adopt the present invention, choose the MUT-1 and FCC-D-1, FCC-B-1 ultrasonic detection instrument, CUS-21J ultrasonic detection system and FJ-1 high-resolution ultrasonic transducer produced by AVIC Composite Materials Co., Ltd., A series of practical detection applications have been carried out on the R zone of carbon fiber composite structures with different thicknesses by using water film coupling. Display mode and image mode, through manual scanning and automatic scanning detection methods, a series of detection applications have been carried out. The actual detection results show that: 1. When the ultrasonic detection detects that there is no defect inside the composite material structure R to be detected, the detection signal displayed by the display unit 5 Only in with and Both are 0; 2 When the ultrasonic detection detects that there is a delamination defect inside the skin in the composite material structure R to be detected, the detection signal displaye...

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Abstract

The invention belongs to the technical field of nondestructive testing, and relates to a method for ultrasonic distinguishing of an R-region defect of a composite material structure. The method for ultrasonic distinguishing of the R-region defect of the composite material structure and a method for determining the depth position of the detected defect are constructed by utilizing the signal relationship between changes of time domain amplitude, phase position and propagation time as well as other parameters and the inside of an R-region skin, the interface between the R-region skin and an R-region filling area, the R-region filling area and the defect thereof of the detected composite material structure based on broadband narrow pulse ultrasonic reflection signals from different directions and positions of the R-region of the detected composite material structure and characteristics thereof; and the ultrasonic RF and imaging detection of the R-region of the composite material structure can be realized by adopting a soft membrane contact coupling or water-spray coupling, manual or automatic scanning mode, and the detecting thickness range of the R-region is 0.5-20mm. Actual detection results indicate that the accuracy and the reliability for distinguishing of R-region ultrasonic detection defects of the composite material structure, as well as the defect detection capability and the detectability for the R-region can be remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of nondestructive testing, and relates to an ultrasonic discrimination method for defects in the R zone of a composite material structure. Background technique [0002] Composite material structures have been applied in batches in aerospace, transportation and other fields. The R zone is an important connection and geometric transition zone in composite material structures, which plays the role of bearing and force transmission. Therefore, 100% coverage non-destructive testing of the R-zone in composite structures is usually required. At present, defect discrimination is mainly based on the amplitude of the ultrasonic reflection signal from the R-zone of the composite material structure (i.e., the dB method). , affecting the identification of defects and the quantitative analysis of defects, it is easy to cause missed detection and misjudgment of defects. Contents of the invention [0003] The object of ...

Claims

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Application Information

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IPC IPC(8): G01N29/07
CPCG01N29/075G01N2291/0231
Inventor 刘松平刘菲菲李乐刚白金鹏傅天航
Owner AVIC BEIJING AERONAUTICAL MFG TECH RES INST
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