Estudo dos critérios de falhas em compósitos PPS/fibras de carbono utilizando elementos finitos
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Data
2009-06-29
Autores
Siqueira, Eder José [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
O constante desenvolvimento dos materiais aliado à necessidade de se obter componentes estruturais de alto desempenho como materiais alternativos na indústria aeronáutica, bem como considerando a aplicabilidade atual dos compósitos estruturais, previsões de falha da estrutura e análise das cargas máximas que as mesmas podem suportar se tornam tópicos fundamentais de pesquisas com a finalidade de garantia da confiabilidade quanto ao emprego dos mesmos em diversas áreas. Considerando que o compósito termoplástico do tipo PPS/C – Poli(sulfeto de fenileno) reforçado com fibras de carbono está surgindo como uma alternativa a compósitos poliméricos termorrígidos e que ainda há escassez na literatura atual de dados relativos à previsão de falhas, este trabalho se detém na analise bidimensional do comportamento mecânico do compósito PPS/C sob carregamento estático linear em flexão de três pontos e em tração com relação a alguns critérios de previsão de falhas inseridos no aplicativo computacional ANSYS, que são os critérios da máxima tensão, dos índices de forças e das relações inversas dos índices de forças de Tsai-Wu, bem como os critérios de previsão de falhas de Hill e de Hoffman calculados através do EXCEL com base nas tensões fornecidas pelo ANSYS e nas resistências contidas na literatura. Por fim, foram comparados os resultados obtidos através do modelo computacional com os resultados experimentais com o objetivo de analisar, avaliar e validar a simulação numérica como complementação dos ensaios experimentais.
The continuous development of materials associated with the need to obtain structural components of high performance that can serve the purpose of alternate material for the aircraft industry; in addition to the current applicability of the structural composite, structural failure predictions, as well as the maximum loads that such structures may have the capacity to bear, have become the subject-matter to a number of fundamental researches, which purpose is to guarantee the reliability of such materials, so that they can be duly applied in a variety of fields. Taking into account that the thermoplastic composite of PPS/C – Poly(phenylene-sulfide) type, reinforced with carbon fibers, is springing up as an alternate to the thermoset polymers composites, besides the fact that the current literature lacks data regarding failure predictions, the present paper limits itself to the two-dimensional analysis of PPS/C composite type mechanical behavior under a linear static loading at a three point bending and in traction with regards to some predicted failure criteria that have been inserted in ANSYS computer model, namely the maximum stress criteria, the strength ratio, and the reversed relation of strength ratio of Tsai-Wu, as well as the criteria of Hill and Hoffman to predict failure, which in turn were calculated on EXCEL, but based on the stresses supplied by ANSYS, and on the tensile strengths found on the literature. At last, a comparison was made between the results obtained from the computer model against the experimental results. The purpose of such comparison was to analyze, assess and validate the numerical simulation as a supplement to the experimental trials.
The continuous development of materials associated with the need to obtain structural components of high performance that can serve the purpose of alternate material for the aircraft industry; in addition to the current applicability of the structural composite, structural failure predictions, as well as the maximum loads that such structures may have the capacity to bear, have become the subject-matter to a number of fundamental researches, which purpose is to guarantee the reliability of such materials, so that they can be duly applied in a variety of fields. Taking into account that the thermoplastic composite of PPS/C – Poly(phenylene-sulfide) type, reinforced with carbon fibers, is springing up as an alternate to the thermoset polymers composites, besides the fact that the current literature lacks data regarding failure predictions, the present paper limits itself to the two-dimensional analysis of PPS/C composite type mechanical behavior under a linear static loading at a three point bending and in traction with regards to some predicted failure criteria that have been inserted in ANSYS computer model, namely the maximum stress criteria, the strength ratio, and the reversed relation of strength ratio of Tsai-Wu, as well as the criteria of Hill and Hoffman to predict failure, which in turn were calculated on EXCEL, but based on the stresses supplied by ANSYS, and on the tensile strengths found on the literature. At last, a comparison was made between the results obtained from the computer model against the experimental results. The purpose of such comparison was to analyze, assess and validate the numerical simulation as a supplement to the experimental trials.
Descrição
Palavras-chave
Compositos polimericos, Método dos elementos finitos, Polymers composites
Como citar
SIQUEIRA, Eder José. Estudo dos critérios de falhas em compósitos PPS/fibras de carbono utilizando elementos finitos. 2009. 181 f. Dissertação (mestrado) - Universidade Estadual Paulista, Faculdade de Engenharia de Guaratinguetá, 2009.