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The transport and construction industries are increasingly interested in natural fiber composites (NFCs) for the production of some of their structural elements. NFCs have significant advantages over synthetic fiber-based composites: lightweight, mechanical resistance, thermal and acoustic insulation. In addition, natural fibers are renewable and biodegradable, a significant advantage over synthetic and petrochemical-based fibers. In this study, honeycomb cores made from non-woven flax-epoxy composites are investigated. The experimental characterization focuses on their compressive response. Three different core densities are used: 100 g/m2, 150 g/m2 and 200 g/m2. In addition to the compressive behavior, honeycomb core damage was monitored using acoustic emission (AE). The K-means method was used to classify acoustic events and to identify damage mechanisms.

Characterisation of Natural Flax Fibers Honeycomb: Compression Damage Analysis Using Acoustic Emission