Static and dynamic mechanical response of different cork agglomerates

Abstract

a b s t r a c tCork is a natural cellular material capable of withstanding considerable amounts of energy and exhibiting a viscoelastic return to its original shape. This feature is particularly interesting to resist to successive impacts. In this study, the behavior of different types of agglomerated cork (AC) and expanded cork (EC) is investigated under static and dynamic loadings. Double impact was carried out on the samples using a hemispheric actuator. The peak acceleration data for all compounds were further analyzed. Static compression tests gave an interesting insight into the stress-strain curve of agglomerates and Poisson's ratio variation during deformation. Results demonstrate a clear influence of agglomerated density and grain size on the resulting mechanical properties and point out a tremendous potential for this sustainable material to be tailored to fit diverse crashworthiness applications.

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

“…19 a presents the global compressive behaviour of agglomerated cork tested in the three directions. As already reported it demonstrates a foam-like distinctive compressive behaviour [8,9] and it seems to be an elastomeric foam [36] . Hence the three following main stages can be identified.…”

“…It also allows to overstep the anisotropy of natural cork by randomly arranging cork cell orientation and to mold pieces with a more complex geometry. For 10 years, few studies investigated on the mechanical behaviour of such materials under quasi-static and impact loadings [8][9][10][11][12] . Giving its considered applications, they focused on the compressive behaviour of cork agglomerates.…”

Mechanical properties of cork: Effect of hydration

“…In most cases, it is an expansion in compression, or a contraction in tension. For example, Jardin et al, [36] followed the change in dimensions of agglomerated cork samples during compression test. They determined a Poisson ratio close to 0.15 at the beginning of the compression, which decreases to 0.05 at 50% strain.…”

Cork–polymer biocomposites: Mechanical, structural and thermal properties

“…Cork is a lightweight material, viscoelastic and impermeable to liquids or gases, good thermal, acoustic and electrical insulator, sound and vibration insulator and exhibits a near-zero Poisson coefficient, which found applications from the stoppers, agglomerates to aeronautics [5,[8][9][10][11][12]. Furthermore, cork composites are one of the most promising fields of cork technology [8].…”