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This and the next 3 images are from:
J.M. Gattas (1) and Z. You (2)
(1) School of Civil Engineering, University of Queensland, St Lucia QLD 4072, Australia
(2) Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, UK
“The behaviour of curved-crease foldcores under low-velocity impact loads”, International Journal of Solids and Structures, Vol. 53, pp 80-91, January 2015, https://doi.org/10.1016/j.ijsolstr.2014.10.019
ABSTRACT: The primary aim of this paper was to manufacture aluminium curved-crease foldcores and assess their behaviour under quasi-static compressive loads, relative to existing straight-crease foldcores and a honeycomb cores. Four foldcore types, standard, indented, and two curved-crease foldcore tessellations, were constructed with comparable density and height to a commercial honeycomb core. An experimental and numerical study of foldcore performance under quasi-static crush loads showed that all foldcore types were highly sensitive to geometric imperfections, and that curved-crease foldcores had significantly higher energy-absorption capability than straight-crease foldcores. Validated numerical methods were used in a comprehensive parametric study on curved-crease foldcore geometry, with two main findings. First, it was seen that altering the curved-crease foldcore tessellation did not provide significant energy-absorption capability beyond that achievable with direct changes to the core aspect ratio. Second, an optimum configuration of the curved-crease foldcore was found which appeared to offer a comparable out-of-plane strength, energy-absorption under quasi-static compressive loads, and stiffness to a honeycomb core. A brief numerical investigation into low-velocity impact loading showed that curved-crease foldcores were the only foldcore type that saw a substantial inertial strengthening under dynamic loading, although not to as large an extent as honeycomb.
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