Detection and characterisation of defects in composite materials using microwave non-destructive testing methods

This paper proposes a technique for detecting impact-induced surface and subsurface fractures in Glass Fibre Reinforced Composites (GFRPs) and hybrid composite materials. Various categories of composite samples, namely Unidirectional GFRP, Bidirectional GFRP, Woven mat GFRP and Carbon-flax hybrid co...

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Bibliographic Details
Published in:Proceedings of the Institution of Mechanical Engineers. Part C, Journal of mechanical engineering science Journal of mechanical engineering science, 2024-08, Vol.238 (15), p.7652-7660
Main Authors: Balakrishnan, Sakthi Abirami, Ramalingam, Vimal Samsingh, Sundarsingh, Esther Florence, Anbalagan, Abirami, Ramachandran, Achyuth, Ahmed, Waleed, Raman, Shyam, R, Praveen
Format: Article
Language:English
Subjects:
Algorithms
Cracks
Fiber composites
Flax
Fractures
Glass fiber reinforced plastics
Glass fibers
Hybrid composites
Interpolation
Nondestructive testing
Rendering
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Summary:This paper proposes a technique for detecting impact-induced surface and subsurface fractures in Glass Fibre Reinforced Composites (GFRPs) and hybrid composite materials. Various categories of composite samples, namely Unidirectional GFRP, Bidirectional GFRP, Woven mat GFRP and Carbon-flax hybrid composites are fabricated by the hand-layup process, and cracks are induced in the samples by three-point flexural bending test using a Universal Testing Machine. Near-field microwave Non-Destructive Testing (NDT) is employed in detecting the above cracks by recording the S11 parameter from the microwave transceiver probe throughout the sample. For image rendering the resulting outputs are passed as a 2-dimensional array to the image-rendering algorithms, namely Iterative Curve-Based Interpolation (ICBI), Improved New Edge-Directed Interpolation (INEDI) and the Lanczos algorithm. The most suitable algorithm to identify the clear picture and size of crack is identified, and the effectiveness of Microwave NDT for these composites is analysed.
ISSN:0954-4062
2041-2983
DOI:10.1177/09544062241233429