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Impact and hardness optimisation of composite materials inspired by the babassu nut (Orbignya speciosa)

The babassu nut is the fruit of the babassu palm Orbignya speciosa. The combination of hardness and impact strength is difficult to acquire for artificial materials, making the babassu nut a promising source for biomimetic inspiration. Unnotched Charpy impact tests, Shore D hardness tests and scanni... Full description

Contained in: Bioinspiration & Biomimetics (Online) Vol. 10, No. 5 (2015), p. 056006/1-12
Journal Title: Bioinspiration & Biomimetics (Online)
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Links: Additional Link (dx.doi.org)
Additional Keywords: CELLULOSISCHE-CHEMIEFASER
CHARPY-SPITZKERBSCHLAGVERSUCH
ELEKTRONENMIKROSKOPIE
FEINHEIT
POLYMILCHSAEURE
POLYPROPYLEN
RANDSCHICHT
SHORE-HAERTE
STOFFGEMISCH
VERBUNDWERKSTOFF
DOI: 10.1088/1748-3190/10/5/056006
Notes: Copyright: Metadaten: TEMA, Copyright WTI-Frankfurt eG
Copyright: (C) Alle Rechte beim Herausgeber
Physical Description: 12 Seiten, 22 Quellen
ID (e.g. DOI, URN): 10.1088/1748-3190/10/5/056006
PPN (Catalogue-ID): WTI055612776
Note: WTI TEMA DB
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520 |a The babassu nut is the fruit of the babassu palm Orbignya speciosa. The combination of hardness and impact strength is difficult to acquire for artificial materials, making the babassu nut a promising source for biomimetic inspiration. Unnotched Charpy impact tests, Shore D hardness tests and scanning electron microscopy were used for mechanical and microscopical analysis of the pericarp. Four major principles were found for a biomimetic approach: a hard core ((1); endocarp) is embedded in a soft outer layer of high impact strength ((2); epicarp) and is reinforced with fibres of variable fineness (3), some of which are oriented radial to the core (4). Biomimetic fibre-reinforced composites were produced using abstracted mechanisms of the babassu nut based on regenerated cellulose fibres (lyocell, L) with two different fineness values as reinforcement embedded in a polylactide (PLA) core matrix and polypropylene (PP) based outer layers. The biomimetic fibre composite reaches a significantly higher impact strength that is 1.6 times higher than the reference sample produced from a PLA/PP/L-blend. At the same time the hardness is slightly increased compared to PP/L. [Copyright IOP Institute of Physics Publishing. Reproduced with permission.] 
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