This paper presents the ductility characterization for a medium carbon steel, for two microstructural conditions, that has been evaluated using the continuum damage mechanics theory, as proposed by Kachanov and developed by Lemaitre. Tensile tests were carried out using loading-unloading cycles in order to capture the gradual deterioration of the elastic modulus, which may be linked to the ductile damage increase with increasing plastic strain. The mechanical parameters for the isotropic damage evolution equation were obtained and then used as inputs for a plasticity-damage coupled numerical algorithm, validated through numerical simulations of the experimental tensile tests. A comparison between the SAE 1050 steels studied and two carbon steel alloys (obtained from the literature), provided some basic understanding of the influence of the carbon level on the evolution of the damage parameters. An empiric relationship for this set of parameters, which can provide useful data for preliminary studies envisaging prediction of ductile failure in carbon steels, is also presented.
Dedico este trabalho ao meu avô, Stergios, imigrante, autodidata e inspirador da terceira geração de engenheiros da família. AGRADECIMENTOS Agradeço à família, sempre. Agradeço a Pericles, meu pai, engenheiro e exemplo como homem; a Idalina, minha mãe, pelo apoio e orientação nas decisões que tomei; meus irmãos Georgios e Thalles, a melhor companhia que alguém poderia ter no cotidiano agitado de São Paulo; Marcela, sempre atenciosa e carinhosa, me trazendo de volta ao mundo real; aos avós Stergios, Loris e Ana, deseducadores na medida certa, e ao restante de minha enorme família, pelo suporte, atenção e acolhimento, seja na capital, seja no interior. Ao Prof. Dr. Ronald Lesley Plaut, sempre disponível e atencioso na orientação no trabalho, ágil na revisão dos textos e instigador de um trabalho que honre as tradições desta Escola.
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