Obtenção de curvas mestre de compósitos poliméricos estruturais utilizando ensaios dinâmicos mecânicos sob fluência

• Ano de defesa: 2010
• Autor(a) principal: Rocha, Danielle Ferrari Borges
• Orientador(a): Agnelli, José Augusto Marcondes
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de São Carlos
• Programa de Pós-Graduação: Programa de Pós-Graduação em Ciência e Engenharia de Materiais - PPGCEM
• País: BR
• Palavras-chave em Português: Engenharia de materiais; Curva mestre; Viscoelasticidade; Resistência mecânica; Compósitos poliméricos; Ensaios acelerados; Propriedade mecânica; Compósito; DMTA
• Palavras-chave em Inglês: Accelerated test; Master curve; Viscoelasticity; Mechanical properties; Composites; DMTA
• Área do conhecimento CNPq: ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA
• Link de acesso: https://repositorio.ufscar.br/handle/ufscar/814

The growing advanced composites appliance in aircraft s structural parts has demanded to spread the knowledge about mechanical behavior prediction in longer time periods. In this way, the main purpose of this study is to establish an accelerated test method based on mechanical-dynamical-thermal analysis (DMTA), to predict the mechanical behavior of carbon fiber/epoxy resin composites. The DMTA technique was used on two modes: multi-frequency and creep. In the first case, three point bending tests on dynamical mode did not present a good fitting to built master curves, considering the experimental parameters used. Though, creep tests showed good results. In these tests, parameters used as temperature range from 25ºC to 235ºC and isothermals at every 15ºC for 100 minutes allowed to obtain compliance modulus versus time master curves with a good fitting. From the obtained results, it is possible to conclude that the proposed method presented good adhesion to the basic concept of material viscoelasticity, therefore can be used to predict mechanical behavior of composite materials.