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Browsing by Issue Date, starting with "2021-10-04"

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  • Tensile properties of S355 butt welds after exposure to high temperatures
    Publication . Rodrigues, D. M.; Leitao, Carlos; Balakrishnan, M.; Craveiro, Hélder D.; Santiago, A.
    The influence of the exposure to high temperatures on the tensile properties and failure mode of butt-welded connections in 5355 J2 steel was assessed. With this aim, welds were produced using GMAW and FCAW semiautomatic processes. Transverse tensile specimens were extracted from the welded coupons, heated to high temperatures (300, 600 and 900 degrees C), cooled to room temperature and then loaded to failure. Microstructural characterization and hardness measurements were performed to explain the tensile behaviour of the specimens after exposure to high temperatures. Tests at ambient temperature were also conducted for benchmark comparison. From the analyses, it was possible to conclude that, in the absence of welding defects, the residual properties of the 5355 joints, after heat exposure, are very similar to that of the base material. However, the presence of welding defects, depending on its severity and typology, may conduct to rupture in the welds and low residual strength, after heat exposure. This happens even if those defects not affect the tensile properties of the connections in the as-welded condition. The residual capacity of steel structures will be only severely reduced after heat exposure to temperatures in the eutectoid range, i.e., between 700 and 900 degrees C. The critical exposure temperature may vary according to the chemical composition of the steels/welds and to the duration of the heat exposure. The strength loss and the ductility of the BM and of the connections are dependent of the duration of the heat exposure. Very long exposure conditions conduct to a maximum decrease in residual yield and ultimate strength of 30 % and 20%, respectively, in S355 J2 steels and welds.
    2021-10-04Journal article Restricted access Show more
  • Teatro dos renegados & a bolha marginal na era digital
    Publication . Siqueira, César Augusto Ruiz de; Rosa, Armando Nascimento
    Este é um relatório de estágio que aborda o meu percurso como ator dentro da companhia teatral brasileira Os Satyros entre o mês de março e dezembro de 2020, o ano em que a pandemia da Covid-19 assolou o planeta e o mundo das artes cênicas ficou fisicamente paralisado. Dessa forma, o conteúdo deste trabalho narra além das minhas experiências pessoais e profissionais com o grupo paulistano, a transição d’ Os Satyros do espaço cênico físico para o digital, apresentando, através da telecopresença, o seu pioneiro e inovador espetáculo: A Arte de Encarar o Medo. Narro em primeira pessoa todo o processo de criação e de ensaios através do sistema de devising, usado pelo coletivo, e conto toda a trajetória até atingirmos as quase cem apresentações públicas. Este relatório também ressalta a grande importância das tecnologias contemporâneas, que foram essenciais para que este projeto fosse realizado. Tenho como base bibliográfica pensadores e estudiosos como Alberto Guzik, Augusto Boal, Judith Butler, Paul B. Preciado, Ivam Cabral, Rodolfo García Vázquez, Virginie Despentes, entre outros; e se dirige a todos os estudantes e profissionais das artes performativas que se utilizam da tecnologia para o fazer teatral.
    2021-10-04Master thesis Open access Show more