Mestrado em Engenharia Mecânica

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http://repositorio.ufes.br/handle/10/17622

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    Análise comparativa de aços ARBL usados na fabricação de tubos flexíveis para produção de petróleo no mar, em formações com baixo teor de H2S : um estudo de FPH utilizando solução de tiossulfato de sódio
    (Universidade Federal do Espírito Santo, 2006-06-02) Girelli, Rosental Alves; Scandian, Cherlio; Macêdo, Marcelo Camargo Severo de; 1º membro da banca
    This document is an experimental study of the Stress Corrosion Cracking (SCC) and Hydrogen Embrittlement (HE) behavior of a Brazilian high-strength low-alloy steel, in media with low content of H2S. It is intended to begin a qualification process of the material, which is already used in flexible pipes for petroleum production operations at the sea in situations where there is no H2S presence, to also act in cases where low concentration of this gas exists. A heat treatment is proposed for the resistance improvement of the material in these environments. The base for experimental results comparison was another material, a French one, which is already qualified and used in flexible pipes for sour oil (with H2S) production. Hence, three materials were tested: the original Brazilian one, without heat treatment (it is used in flexible pipes, in situations without H2S), the same material with the heat treatment suggested for the property improvement and possible use in low H2S environments and the French one (qualified material used in flexible pipes for oil production operations, in situations where the presence of H2S is a reality). The SCC Slow Strain Rate and Constant Strain techniques were used as the experimental tests and the media was an aqueous solution of NaCl with micro addictions of sodium thiosulfate (Na2S2O3), indicated to simulate corrosive environments with low concentration of H2S. Damage parameters (energy), embrittlement measurements, tensile properties and also fracture features of the specimens were evaluated at the comparative analysis of the materials.
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    Análise da influência das tensões residuais na variação do comportamento do ruído magnético de Barkhausen em arames utilizados em dutos flexíveis
    (Universidade Federal do Espírito Santo, 2024-02-27) Feijó, Gabriel Fracalossi; Co-orientador1; https://orcid.org/; http://lattes.cnpq.br/; Co-orientador2; https://orcid.org/; http://lattes.cnpq.br/; Co-orientador3; https://orcid.org/; http://lattes.cnpq.br/; Co-orientador4; ID do co-orientador4; Lattes do co-orientador4; Orientador1; https://orcid.org/; http://lattes.cnpq.br/; Orientador2; https://orcid.org/; http://lattes.cnpq.br/; https://orcid.org/; http://lattes.cnpq.br/; 1º membro da banca; https://orcid.org/; http://lattes.cnpq.br/; 2º membro da banca; https://orcid.org/; http://lattes.cnpq.br/; 3º membro da banca; https://orcid.org/; http://lattes.cnpq.br/; 4º membro da banca; http://lattes.cnpq.br/; 5º membro da banca; https://orcid.org/; http://lattes.cnpq.br/; 6º membro da banca; https://orcid.org/; http://lattes.cnpq.br/; 7º membro da banca; https://orcid.org/; http://lattes.cnpq.br/
    Flexible pipelines are used in the oil industry to transport oil and gas, being considered an advantageous option for the challenges encountered in the exploration of deeper areas, such as the pre-salt. These ducts are made up of different layers, including the traction reinforcement, made up of steel wires, which are responsible for resisting traction, compression and radial loads applied to this component. Due to the application of complex stress modules, their failure modes can become unpredictable, therefore, verify their integrity becomes essential. The use of electromagnetic techniques presents itself as a good method for the non-destructive evaluation of these materials. The present work aims to present information that makes it possible to understand the influence of residuals stress on the behavior of Barkhausen magnetic noise. To do this, the residuals stress in the flexible tubes will be tested and correlated with the rotational parameters of the Barkhausen magnetic noise and the envelope behavior of this same method. To this end, in the experimental stage, the residual stress will be proven, using the hole drilling method, in the direction of bending transverse, bending and 45º bending transversal. Next, the Barkhausen magnetic noise rotation test will be carried out at frequencies of 50 Hz and 125 Hz. After the experimental part, the RMS parameters and the Barkhausen magnetic noise envelope will be analyzed and correlated with the variation in residual stress. It is worth mentioning that with plastic deformation there is the development of crystalline anisotropy, which also directly influences the results collected. Note that the rotational RMS presents a more objective characterization of crystalline anisotropy, while the Barkhausen magnetic noise envelope presents a better understanding of the residual stress variation in the tested samples but is a challenge to separating the influence of residuals stress in the envelope of magnetic noise in materials that present crystalline anisotropy