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Visual Quantitative Detection of Delamination Defects in GFRP via Microwave.
Xihan Yang1, Yang Fang1, Ruonan Wang1
1State Key Laboratory for Strength and Vibration of Mechanical Structures, Shaanxi Engineering Research Centre of NDT and Structural Integrity Evaluation, School of Aerospace Engineering, Xi'an Jiaotong University, Xi'an 710049, China.
This study introduces a novel microwave imaging method for detecting delamination defects in Glass Fiber reinforced polymers (GFRPs). The technique enables accurate visual and quantitative characterization of internal flaws, enhancing equipment safety and lifespan.
Area of Science:
- Materials Science
- Non-Destructive Testing
- Microwave Engineering
Background:
- Glass Fiber reinforced polymers (GFRPs) are susceptible to delamination defects due to their multilayer structure.
- These defects compromise the integrity and safety of GFRP components.
- Effective monitoring of delamination is crucial for assessing equipment performance and lifespan.
Purpose of the Study:
- To develop a visual and quantitative method for characterizing delamination defects in GFRPs.
- To combine visual detection with quantitative analysis for nondestructive testing (NDT).
- To address the limited research in quantitative characterization of microwave-detected defects.
Main Methods:
- Implementation of a 2D-imaging visualization and quantitative characterization technique.
- Development and utilization of a microwave testing experimental system.
- Validation of the method's effectiveness in detecting and quantifying internal delaminations.
Main Results:
- The proposed method successfully detected all internal delamination defects of 0.5 mm thickness in GFRP with high accuracy.
- Achieved a signal-to-background ratio (SBR) of 4.41 dB for the 2D imaging.
- Demonstrated quantitative accuracy with positional errors within 0.5 mm and relative area errors within 11%.
Conclusions:
- The developed microwave imaging method is effective and innovative for GFRP delamination detection.
- The technique enables accurate visual and quantitative assessment of internal defects.
- This approach enhances the NDT capabilities for GFRP structures, improving safety and reliability.
