Dynamic crushing and energy absorption of regular, irregular and functionally graded cellular structures

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Dynamic behaviour of auxetic gradient composite hexagonal honeycombs (2016, positive): “The energy absorption of functionally graded regular hexagonal honeycombs has been observed to be highly sensitive to the type of gradient topology used, especially under very high dynamic compressive loading and during the early stages of crushing [18].”
Compressive behaviour of 3D printed thermoplastic polyurethane honeycombs with graded densities (2019, background): “[15] showed that by grading the density of a honeycomb in 5 discrete regions, the deformation-mode and energy absorption characteristics could be significantly modified from the equivalent uniform density structure.”
Dynamic compressive behaviour of cellular materials: A review of phenomenon, mechanism and modelling (2018, positive): “In the subsequent studies, it has been shown that the morphology [28-35], topology [36-39] and defects [40-46] of cell structure can also significantly affect the bulk properties.”