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Influence of Composite Ply Layup on Active Thermographic Non-destructive Inspection of Carbon Fiber-Reinforced Plastic Laminates

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Abstract

This paper examines the effect of the composite ply layup on defect detection using non-destructive active thermographic inspection of carbon fiber-reinforced plastic (CFRP) laminates. Numerical calculations using simplified models were performed and verified experimentally. The results indicated that the local temperature contrast (\(\Delta T\)) observed on the surface of the laminates, generally caused by existing internal defects, depended on two characteristics of the laminates: the difference between the orientation angles of neighboring layers \((\theta _{\mathrm{d}})\) and the number of different orientation angles in the layers \((N_{\mathrm{a}})\). The \(\Delta T\) was higher when \(\theta _{\mathrm{d}}\) and \(N_{\mathrm{a}}\) were small. These effects were more clearly observed when inspecting CFRPs reinforced with carbon fibers with higher thermal conductivity (such as pitch-based fibers), and when the number of layers is larger.

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Acknowledgements

Part of this work was supported by JSPS KAKENHI Grant Number 26282099.

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Authors and Affiliations

  1. Graduate School of Science and Technology, Tokushima University, 2-1 Minamijousanjima-cho, Tokushima, 770-8506, Japan

    Masashi Ishikawa

  2. School of Science and Engineering, Meisei University, 2-1-1 Hodokubo, Hino, Tokyo, 191-8506, Japan

    Masashi Koyama

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  1. Masashi Ishikawa
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Correspondence to Masashi Ishikawa.

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Ishikawa, M., Koyama, M. Influence of Composite Ply Layup on Active Thermographic Non-destructive Inspection of Carbon Fiber-Reinforced Plastic Laminates. J Nondestruct Eval 37, 18 (2018). https://doi.org/10.1007/s10921-018-0472-6

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  • DOI: https://doi.org/10.1007/s10921-018-0472-6

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