Abstract

Natural fibres present ozone-friendly solutions in the field of construction. The attenuation of the sound and heat losses is an important feature in such type of materials above all, when used in non-woven fabrics and fibre-reinforced composites. Hemp fibres show robust insulation performance; this research work should be considered beneficial to the development of a non-destructive thermographic methodology, which can address the thermal barrier (typically applied on multi-layer panel) effects. The intent is to assess the integrity of the sub-surface reinforcing glass fibres; such integrity state will help confer the rigidity and the resistance to mechanical stresses. The testing proposed in this study can be further developed in a laboratory right after the manufacturing process of similar type of components. The testing needs preliminary numerical simulations to help guide the selection of the appropriate pre- and post-processing algorithms combined with or without segmentation operators. A set of numerical and experimental tests were performed through controlled thermal stimulation while recording the thermal responses. The study also highlights the advantages, disadvantages, and future development of the presented technique and methodologies.

Highlights

  • Non-destructive testing (NDT) of composites, including active infrared thermography (IRT), remains an important issue in civil engineering [1]

  • Infrared NDT has proven to be efficient in inspecting glass fibres, but there is still a lack of knowledge in using IRT techniques to assess the composite integrity, when combining glass fibres with hemp fibres scattered in a matrix, to be used as protective coating

  • Observing the six indicator vector (IV) images of the local linear embedding (LLE) results, it can be said that the inhomogeneous background is attenuated in the images when compared to the isometric feature mapping (ISOMAP) results

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Summary

A Numerical–Thermographic–Segmentation Approach

Kaixin Liu 1 , Stefano Perilli 2 , Arsenii O.

Introduction
Numerical Results
Processing Experimental Thermograms
ISOMAP
Discussion and Conclusions
Full Text
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