(a) Stress-strain and (b) Energy absorption-strain of three types of honeycomb

Fig. 23. Stress-strain (a) and energy absorption-strain (a) curves of E-HC, UR/PU-HC and GR/PU-HC structures after impact tests

“E-HC” = Empty HoneyComb cells
“UR/PU-HC” = UnReinforced PolyUrethane HoneyComb
“GR/PU-HC” = Graphene Reinforced PolyUrethane HoneyComb

From the same paper as the previous 2 images

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