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Investigações experimentais sobre compósitos de alumÃnio
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ISBN10: 6209426476
ISBN13: 9786209426476
Publisher: Edicoes Nosso Conhecimento
Published: Jan 20 2026
Pages: 164
Weight: 0.50
Height: 0.38 Width: 6.00 Depth: 9.00
Language: Portuguese
ISBN13: 9786209426476
Publisher: Edicoes Nosso Conhecimento
Published: Jan 20 2026
Pages: 164
Weight: 0.50
Height: 0.38 Width: 6.00 Depth: 9.00
Language: Portuguese
Os compósitos de matriz de alumÃnio (AMC) oferecem uma resistência superior, rigidez, resistência ao desgaste e baixa densidade em comparação com as ligas não reforçadas. Os AMC reforçados com SiC, grafite e outros carbonetos, nitretos, boretos e óxidos são amplamente utilizados, sendo a fundição por agitação o método de fabrico preferido. As propriedades dos compósitos dependem do tipo, dimensão e distribuição dos reforços, bem como de factores de processamento como a velocidade de agitação, a temperatura e o tempo. O comportamento de desgaste é influenciado pela carga e pela distância de deslizamento, enquanto as caraterÃsticas de maquinação por EDM, como a MRR, a TWR e a rugosidade da superfÃcie, dependem da corrente, do tempo de impulso, da tensão e da pressão de descarga. Para ultrapassar a otimização por tentativa e erro, foram desenvolvidos modelos de regressão e ANN para prever a perda de peso e as respostas de maquinagem utilizando experiências baseadas em CCD. Foram efectuados estudos de tratamento térmico, dureza e SEM para analisar os efeitos do envelhecimento e a distribuição das partÃculas. Os resultados apoiam as indústrias na previsão do desgaste, no desempenho da maquinação e na conceção de componentes AMC, tais como tambores de travão para automóveis.
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