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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