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Espuma de alumÃnio reforçada com grafeno para o sector automóvel e aeroespacial
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ISBN10: 6207891600
ISBN13: 9786207891603
Publisher: Edicoes Nosso Conhecimento
Published: Jul 31 2024
Pages: 92
Weight: 0.32
Height: 0.22 Width: 6.00 Depth: 9.00
Language: Portuguese
ISBN13: 9786207891603
Publisher: Edicoes Nosso Conhecimento
Published: Jul 31 2024
Pages: 92
Weight: 0.32
Height: 0.22 Width: 6.00 Depth: 9.00
Language: Portuguese
A presente investigação aborda o comportamento de deformação compressiva da espuma composta de Al e da espuma de alumÃnio reforçada com grafeno sob condições de carga compressiva estática e dinâmica com taxas de deformação de 500/s-1276/s. A espuma de alumÃnio de célula fechada foi fabricada utilizando uma rota de metalurgia lÃquida para uma concentração de 0,5% de grafeno. O comportamento de compressão de alta taxa de deformação da espuma hÃbrida (densidade relativa: 0,23 a 0,29) foi estudado usando o teste de barra de pressão Split Hopkinson, os resultados dos testes de compressão mostram que a tensão de platô e a absorção de energia da espuma de grafeno Al são muito maiores do que a espuma composta de Al. O reforço de grafeno aumenta a tensão de patamar e a capacidade de absorção de energia da espuma em 1,25-2,4 vezes nos ensaios estáticos. Este facto deve-se principalmente à presença de grafeno que, por sua vez, reforça as paredes celulares. Verifica-se que a tensão de patamar e a absorção de energia da espuma hÃbrida aumentam à medida que a taxa de deformação aumenta em toda a gama de taxas de deformação de 500s-1 a 2760s-1. A tensão de patamar é sensÃvel à taxa de deformação, mas insensÃvel à tensão de densificação. Também se observa que a tensão de patamar não é sensÃvel à densidade relativa.
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