Saufi SASA et al. (2021), Compression Behaviour of Bio-Inspired Honeycomb...

ECB-ART-50610

Polymers (Basel) 2021 Dec 14;1324:. doi: 10.3390/polym13244388.

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Compression Behaviour of Bio-Inspired Honeycomb Reinforced Starfish Shape Structures Using 3D Printing Technology.

Saufi SASA , Zuhri MYM , Dezaki ML , Sapuan SM , Ilyas RA , As'arry A , Ariffin MKA , Bodaghi M .

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The bio-inspired structure (e.g., honeycomb) has been studied for its ability to absorb energy and its high strength. The cell size and wall thickness are the main elements that alter the structural ability to withstand load and pressure. Moreover, adding a secondary structure can increase the compressive strength and energy absorption (EA) capability. In this study, the bio-inspired structures are fabricated by fused deposition modelling (FDM) technology using polylactic acid (PLA) material. Samples are printed in the shape of a honeycomb structure, and a starfish shape is used as its reinforcement. Hence, this study focuses on the compression strength and EA of different cell sizes of 20 and 30 mm with different wall thicknesses ranging from 1.5 to 2.5 mm. Subsequently, the deformation and failure of the structures are determined under the compression loading. It is found that the smaller cell size with smaller wall thickness offered a crush efficiency of 69% as compared to their larger cell size with thicker wall thickness counterparts. It is observed that for a 20 mm cell size, the EA and maximum peak load increase, respectively, when the wall thickness increases. It can be concluded that the compression strength and EA capability increase gradually as the cell size and wall thickness increase.

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References :

Meng, The energy absorption and bearing capacity of light-weight bio-inspired structures produced by selective laser melting. 2019, Pubmed

	Figure 1. Starfish shape [41].
	Figure 2. Illustration of honeycomb reinforced starfish structure.
	Figure 3. Cell size of (a) 20, (b) 25 and (c) 30 mm.
	Figure 4. The final 3D printed specimens for (a) cell size 20 mm, thickness 2.5 mm, (b) cell size 25 mm, thickness 2 mm and (c) cell size 30 mm, thickness 1.5 mm.
	Figure 5. (a) Schematic of sample orientation during test. (b) Sample orientation during test.
	Figure 6. The load-displacement curve for samples with 20 mm cell size with 2 mm wall thickness.
	Figure 7. Load-displacement curve of a sample with a 25 mm cell size, 2 mm wall thickness, showing the (a) initial stage and (b) second stage of the failure.
	Figure 8. Comparison between constant wall thicknesses with variable cell sizes.
	Figure 9. Cell size 20 mm, wall thickness 2.5 mm load-displacement mean curve.
	Figure 10. Comparison between constant cell sizes with variable thickness.
	Figure 11. Comparison of CFE with different cell sizes and wall thickness.
	Figure 12. The comparison of EA for the same cell size with different wall thicknesses.
	Figure 13. The SEA comparison of the same wall thickness with different cell sizes.