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Browsing by Issue Date, starting with "2024-04-15"

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  • Microstructural characterization and corrosion-resistance behavior of friction stir-welded A390/10 wt% SiC composites-AA2024 Al alloy joints
    Publication . Aval, Hamed Jamshidi; Galvão, Ivan
    This study examined the effect of traverse speed on the mechanical properties, corrosion-resistance behavior, and microstructure of friction stir-welded A390/10 wt% SiC composites AA2024 Al alloy joints. The laminar flow of both materials was found to diminish in the stir zone (SZ) when the traverse speed of the tool increased from 40 to 80 mm/min, lowering their mixing rate. Large aspect ratio Si particles are broken by the tool pin-induced applied plastic strain, which turns them into refined equiaxed particles. Their aspect ratio remains unchanged in the SZ, despite their decreasing size. SiC and Si particles progressively come into view when moving from the AA2024 alloy’s SZ to the composite workpieces. These changes happen abruptly as traverse speed increases due to the lack of an interfacial layer structure. The advancing side (AS)’s SZ grain size drops from 4.2 ± 0.3 μm to 1.2 ± 0.2 μm as the traverse speed drops from 80 to 40 mm/min. Increased traverse speed from 40 to 80 mm/min will result in a 5.8% decrease in elongation percentage (EP) and 8.4%, 36%, and 10.3% increases in the ultimate tensile strength (UTS), corrosion resistance, and yield strength, respectively.
    2024-04-15Journal article Open access Show more
  • Ricardo Reis no espetáculo do mundo: uma interpretação cénica saramaguiana da personagem Ricardo Reis de "O ano da morte de Ricardo Reis" de José Saramago
    Publication . Lopes, Adérito
    No ano 2016 estreava pelo grupo A Barraca o espetáculo 1936, O Ano da Morte de Ricardo Reis, a partir do romance com o mesmo nome de José Saramago. Ricardo Reis foi a personagem que me foi atribuída. Sendo esta uma personagem saramaguiana herdada de Fernando Pessoa, transporta consigo um percurso que se estendeu para além das vidas dos seus progenitores. No presente trabalho proponho-me a apresentar a caminhada desta personagem heteronímica desde a obra escrita até ao palco, descodificando-a para o espaço cénico. Assim, a personagem que nasce em Pessoa, renasce com Saramago, é adaptada dramaturgicamente por Hélder Mateus da Costa, e logo posteriormente interpretada em cena.
    2024-04-15Thesis Open access Show more