Effect of polymer foam anisotropy on energy absorption during combined shear-compression load

Journal article (2018)

Authors

Yasmine Mosleh Katholieke Universiteit Leuven
Kelly Vanden Bosche Katholieke Universiteit Leuven
Jos Vander Sloten Katholieke Universiteit Leuven
Ignaas Verpoest Katholieke Universiteit Leuven
Jan Ivens Katholieke Universiteit Leuven
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Published Date

2018

Language

English

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Abstract

Polymeric foams are extensively used in applications such as packaging, sports goods and sandwich structures. Since in-service loading conditions are often multi-axial, characterisation of foams under multi-axial loading is essential. In this article, quasi-static combined shear-compression behaviour of isotropic expanded polystyrene foam and anisotropic polyethersulfone foam was studied. For this, a testing apparatus which can apply combined compression and transverse shear loads was developed. The results revealed that the shear and compression energy absorption, yield stress and stiffness of foams are dependent on deformation angle. The total energy absorption of the anisotropic polyethersulfone foam is shown to be direction dependent in contrast to isotropic expanded polystyrene. Furthermore, for similar relative density, polyethersulfone foam absorbs more energy than expanded polystyrene foam, regardless of deformation angle. This study highlights the importance of correct positioning of foam cells in anisotropic foams with respect to loading direction to maximise energy absorption capability