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Percorrer por autor "Costa, Tiago"

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  • Guyd Robot
    Publication . Calçada, Carolina; Costa, Tiago; Costa, Jacinta Casimiro da
    O trabalho que se apresenta foi realizado na unidade curricular de investigação em design orientada pela docente Jacinta Costa e parte da análise do projeto desenvolvido na Unidade Curricular de Design de Produto II da licenciatura de Arte e Design, da Escola Superior de Educação de Bragança, sob a tutela de Teresa Tavares, Carlos Costa, em colaboração com o Centro de Investigação CEDRI - Research Centre in Digitalization and Intelligent Robotics e que teve como objetivo conceber o design exterior de um robot, com finalidade de apoiar a comunidade académica do Instituto Politécnico de Bragança.
    2022Póster em conferência Acesso aberto Ver mais
  • Solidification and heat-treatment conditions affecting the tensile properties and fracture feature of an automotive alsimg alloy
    Publication . Barbosa, Carolina; Azevedo, Hugo; Costa, Sharlane; Ribeiro, J.E.; Carlos, José; Costa, Tiago; Rocha, Otavio
    In this work, a study on the interrelationship between the solidification and heat-treatment processes parameters with tensile properties and fracture feature was performed with an automotive AlSiMg alloy. For that, samples of the horizontally solidified Al7Si0.3 Mg (wt.%) alloy were subjected to the T6-heat treatment, and tensile tests were performed on both investigated samples, under conditions established from the literature. The solidification conditions such as growth and cooling rates and the secondary dendritic spacing (V-L and T-R and lambda(2), respectively) and their effects on the ultimate tensile strength (sigma(UTS)) and elongation (E%) were evaluated. Higher sigma(UTS) values were observed in the heat-treated samples and finer microstructures resulted in a better E% performance. Analysis by SEM/EDS fractography on both samples showed a mix between brittle and ductile fractures, constituted by cleavage facets, secondary cracks, facets covered with micro-voids, tear ridges and dimples. This allowed the deduction of the occurrence of a transition of a transition from ductile to brittle fracture along the solidified ingot as well as the predominance of brittle fracture in the heat-treated samples.
    2023Artigo científico Acesso aberto Ver mais