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Schiuma di alluminio rinforzata con grafene per il settore automobilistico e aerospaziale
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ISBN10: 6207891619
ISBN13: 9786207891610
Publisher: Edizioni Sapienza
Published: Jul 31 2024
Pages: 92
Weight: 0.32
Height: 0.22 Width: 6.00 Depth: 9.00
Language: Italian
ISBN13: 9786207891610
Publisher: Edizioni Sapienza
Published: Jul 31 2024
Pages: 92
Weight: 0.32
Height: 0.22 Width: 6.00 Depth: 9.00
Language: Italian
La presente ricerca è rivolta al comportamento di deformazione a compressione della schiuma di alluminio composita e della schiuma di alluminio rinforzata con grafene in condizioni di carico statico e dinamico a compressione con velocità di deformazione di 500/s-1276/s. La schiuma di alluminio a celle chiuse è stata prodotta utilizzando un processo di metallurgia liquida per una concentrazione dello 0,5% di grafene. Il comportamento a compressione ad alta velocità di deformazione della schiuma ibrida (densità relativa: da 0,23 a 0,29) è stato studiato utilizzando il test Split Hopkinson Pressure Bar; i risultati delle prove di compressione mostrano che la sollecitazione di plateau e l'assorbimento di energia della schiuma di grafene Al sono molto più elevati rispetto alla schiuma composita di Al. Il rinforzo di grafene aumenta la sollecitazione di plateau e la capacità di assorbimento di energia della schiuma di 1,25-2,4 volte nelle prove statiche. Ciò è dovuto principalmente alla presenza del grafene, che a sua volta rafforza le pareti cellulari. Si è riscontrato che la sollecitazione di plateau e l'assorbimento di energia della schiuma ibrida sono aumentati all'aumentare della velocità di deformazione nell'intera gamma di velocità di deformazione da 500s-1 a 2760s-1 . La sollecitazione di plateau è sensibile alla velocità di deformazione ma insensibile alla deformazione di densificazione. Si nota anche che la sollecitazione di plateau è insensibile alla densità relativa.
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