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Multi-scale foam : 3D structure/compressive behaviour relationship of agglomerated cork

Abstract : This study focuses on the microstructural aspects of a cork-based by-product known as agglomerated cork and its influence on the compressive mechanical behaviour. The material consists in granulates of a natural polymeric foam-cork-mixed together with a small quantity of a bio-sourced resin. Optical and scanning electron microscopy (SEM) are first used to investigate on the bead geometry and placement and interfaces arrangement. Then X-ray computed tomography allows to study the spatial arrangement of agglomerated cork microstructure and hence to complete and confirm 2D observations. 2D and 3D observations show a transverse anisotropic material which is confirmed by the mechanical tests. SEM pictures demonstrate an intricate and heterogeneous material. Microtomography confirms the presence of macroporosities between cork granulates having a mean volume around 0.1 mm 3. Cork cell specific geometry is also confirmed. The volume of those cells lies around 10 −5 mm 3. Finally quasi-static compression tests are run to establish a link between microstructure and mechanical behaviour thanks to digital image correlation (DIC). Cork agglomerate demonstrates strong strain localisation at its surface caused by its multi-scale structure.
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Submitted on : Thursday, December 9, 2021 - 10:16:27 AM
Last modification on : Wednesday, January 5, 2022 - 9:34:02 AM


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Louise Le Barbenchon, Jérémie Girardot, Jean-Benoît Kopp, Philippe Viot. Multi-scale foam : 3D structure/compressive behaviour relationship of agglomerated cork. Materialia, Elsevier, 2019, 5, pp.100219. ⟨10.1016/j.mtla.2019.100219⟩. ⟨hal-03472052⟩



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