Análise da integridade estrutural de conexões flangeadas em dutos flexíveis

• Ano de defesa: 2019
• Autor(a) principal: Martins, Alexandre Miguel Calhau
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal do Rio de Janeiro; Brasil; Instituto Alberto Luiz Coimbra de Pós-Graduação e Pesquisa de Engenharia; Programa de Pós-Graduação em Engenharia Metalúrgica e de Materiais; UFRJ
• Palavras-chave em Português: Mecânica da fratura; Método dos elementos finitos; Conexões flangeadas; Curvas de resistência; Diagrama de força motriz para a propagação de trinca; CNPQ::ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA
• Link de acesso: http://hdl.handle.net/11422/13534

In this study some numeric technics were evaluated for the calculation of elastoplastic fracture mechanics parameter integral on pre-cracked flanged connections using finite element analysis. Resistance curves to the crack propagation were evaluated experimentally at room temperature (23°C) in metallic material AISI 4130, that is used in the fabrication of flanged connections. The material toughness was also evaluated at low temperatures (-20°C and -40°C) and the integral values at the instability point was obtained. The crack length during the tests was evaluated trough the unloading compliance technique using compact-tension C(T) test specimens. This study provided good results by using finite element on pre-cracked flanged connections in flexible pipes under tension and internal pressure, allowing an instability analysis using Crack Driving Force Diagrams. In addition, it allowed plastic collapse analysis of the flanged connections by comparison of the stress level and the yield strength of the material.