Abstract
This work describes a new class of sandwich panels made of hemp fibre composites and eco-friendly core materials (balsa, paper honeycomb and recycled polyethylene terephthalate foam). The biobased panels are designed to replace analogous glass fibre mat solutions widespread in the automotive sector. Compared to their fossil benchmarks, these panels show a significant reduction in the global warming potential (from 29 to 40%). Moreover, creep/recovery tests performed under two hygrothermal environments (23 °C-50% RH and 70 °C-65% RH) suggest that the time-delayed behaviour must be considered in the design of biobased sandwich panels, particularly for severe environments.
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