Caracterização e modelagem do comportamento mecânico de poliuretana enriquecida com carbonato de cálcio

• Ano de defesa: 2015
• Autor(a) principal: Taguti, Marcos Vinícios Hiroshi
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Tecnológica Federal do Paraná; Cornelio Procopio; Brasil; Programa de Pós-Graduação em Engenharia Mecânica; UTFPR
• Palavras-chave em Português: Biopolímeros; Compostos poliméricos; Simulação (Computadores); Biopolymers; Polymeric composites; Computer simulation; CNPQ::ENGENHARIAS; Engenharia Mecânica
• Link de acesso: http://repositorio.utfpr.edu.br/jspui/handle/1/3339

The biopolymers can be an alternative to petroleum-derived polymers, because they have the advantage of being obtained from a renewable carbon source. In this way the polyurethane (PU) derived from castor oil becomes a strategic option. However, for application in projects of structural components is necessary a study about its properties and mechanical behavior. In this work it made an investigation of the behavior of PU with addition of calcium carbonate in the proportions of 0% (pure polymer), 10%, 20% and 30% by mass were carried out, considering tensile, compressive and flexure monotonic tests. To obtain the displacements and calculation of the strain of the specimens were used two gages in tensile tests and for compressive and flexure tests the technique of optical extensometer by images correlation were used. Based on the Finite Element Method and with the experimentally obtained data were performed computer simulations, applying the model of plasticity of Drucker-Prager and the model of von Mises with viscoplastics effects in order to verify the ability of these models to simulate the mechanical behavior of the studied materials. Finally the computational results were compared to the experimental results and the validation of models was discussed, showing the model of von Mises with viscoplasticity showed a better simulation of the behavior of the materials as compared with the results obtained by the Drucker-Prager model for all types of requests and for any calcium carbonate content.