Modelagem fisicamente não linear de materiais refratários a altas temperaturas considerando efeitos de dano

• Ano de defesa: 2017
• Autor(a) principal: Lucas Breder Teixeira
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Minas Gerais; UFMG
• Palavras-chave em Português: Refratários; Fissuração distribuída; Modelagem numérica; Dano; Engenharia de estruturas; Mecânica do dano contínuo; Método dos elementos finitos; Materiais refratarios
• Link de acesso: http://hdl.handle.net/1843/BUOS-AV2LJZ

This thesis discusses the physically non-linear modeling of refractory materials subjected to high temperatures using the Finite Element Method, where the effects of damage are meaningful to the right description of their behavior during work. Initially a general description of refractory materials is made, citing their several chemical compositions and shapes. The thermomechanical characteristics of such materials are detailed, highlighting mainly their elastic properties, the softening andthe creep and stress relaxation over time. Some considerations are made about the evolution of the numerical modeling of refractorys materials, starting from linear elastic models until the use of complex constitutive models. Since the smeared cracking model is extensively used in this work, it is discussed in more details. The structural analysis software INSANE, developed in the Structural Engineering Department of UFMG, is presented since itll be used as a platform to the modelsimplementation and use in this work, showing the necessary modications init to t the model requirements. Considerations about the models stability are presented regarding the effects of strain localization and modeling results are discussed