Influence of temperature on the behavior of carbon fiber fabrics reinforced PPS laminates

Vieille, B.; Aucher, Jérémie; Taleb, Lakhdar

doi:10.1016/j.msea.2009.03.038

Cited by 52 publications

(48 citation statements)

References 13 publications

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“…Previous works have discussed about transcrystallization in CF/ PPS composites and the degree of crystallinity influence on the mechanical properties [21][22][23][24] . In the present work, morphological observations revealed a highly homogeneous crystallization process for PPS, which posed some difficulties in the visualization of crystallites nucleation on the surface of the carbon fiber.…”

Section: Discussionmentioning

confidence: 99%

“…PPS is also well known for being able to attain a high level of crystallinity, with the commercial grades achieving crystallinities of 60% 8 . Crystallinity degree in high performance thermoplastics is important, because it has a strong influence on chemical and mechanical properties: the crystalline phase tends to increase stiffness and tensile strength, while the amorphous phase is more effective in absorbing impact energy 9 .…”

Section: Introductionmentioning

confidence: 99%

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Correlation between degree of crystallinity, morphology and mechanical properties of PPS/carbon fiber laminates

et al. 2016

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The crystallization degree in semi-crystalline thermoplastics plays an important role in determining the final properties of structural composite material (e.g. toughness, stiffness and solvent resistance). The main purpose of this work is to study different induced degrees of crystallinity in carbon fiber (CF) reinforced polyphenylene sulfide (PPS) composites, by using three different cooling rates during hot compression molding processing (51%, 58% and 62% of crystallinity). In this study, the morphology, thermal and mechanical properties of the produced laminates were investigated and compared. The results showed an increase in the storage modulus (9.8%), Young's modulus (9.2%) and ILSS (14.2%) for the lower cooling rates. Evidences of fiber/interface improvement and crystallites nucleation on the fiber reinforcement surface were also identified.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Correlation between degree of crystallinity, morphology and mechanical properties of PPS/carbon fiber laminates

et al. 2016

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“…A cristalinidade influencia significativamente nas propriedades químicas e mecânicas desses materiais, sendo que em geral, a cristalinidade tende a aumentar a resistência à tração, a rigidez e a resistência a solventes, enquanto que a fase amorfa confere a característica de maior absorção da energia de impacto [5,8] . O grau de cristalinidade é consequência de diversos fatores, incluindo a natureza do polímero e suas condições de processamento.…”

Section: Processamentounclassified

“…Ainda nesse sentido, outros estudos se apresentam para contribuir no desenvolvimento dessa tecnologia [12,13] , na avaliação mais detalhada do comportamento mecânico desses materiais, bem como no estudo da influência da temperatura nas características finais dessa classe de compósitos poliméricos [8,14,15] . Nesse sentido, este presente estudo mostra o trabalho realizado no processamento de compósitos de poli(sulfeto de fenileno) reforçados com tecido de fibra de carbono em autoclave, sob diferentes ciclos de consolidação.…”

Section: Processamentounclassified

“…Os polímeros PEEK e PEKK destacam-se ainda mais por manterem suas elevadas rigidez em altas temperaturas (temperatura de transição vítrea (T g ) em torno de 150 °C) [5,6] . Nesse sentido, a matriz de PPS vem também se destacando pelo seu processamento ocorrer em temperaturas menores que as necessárias para o PEEK e PEKK, e por conferir boas propriedades mecânicas a laminados com requisitos de uso em temperaturas mais altas (T g PPS puro = 89 °C e Tg PPS em compósitos = 126 °C) [7][8][9] . A Tabela 1 apresenta valores de resistências à compressão e flexão Polímeros, vol.…”

Section: Introductionunclassified

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Avaliação dos comportamentos mecânico e térmico de laminados de PPS/fibra de carbono processados em autoclave sob diferentes ciclos de consolidação

Marques¹,

Narita²,

Costa³

et al. 2010

Polímeros

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Resumo: Usualmente, um dos processos mais utilizados para fabricação de componentes em termoplásticos estruturais é a moldagem por compressão a quente, porém restringindo-se na obtenção de peças de pequeno e médio porte. Tal restrição deve-se à limitação do tamanho das prensas utilizadas, principalmente pelo custo envolvido. Procurando ampliar a aplicação de compósitos termoplásticos, possibilitando a fabricação de peças maiores e com maior potencial de integração, pelo uso de infra-estrutura já disponível em processadores de compósitos, este trabalho aborda o processamento de laminados de poli(sulfeto de fenileno) (PPS) reforçado com fibra de carbono em autoclave, pelo uso de quatro diferentes ciclos de consolidação. Os laminados obtidos foram caracterizados por inspeção por ultrassom, análises de DSC para a determinação da cristalinidade e avaliação das propriedades mecânicas em flexão, compressão e cisalhamento interlaminar. Os resultados mostram que laminados obtidos com taxas de resfriamento mais lentas apresentam menor resistência e módulo em compressão, uma vez que o maior grau de cristalinidade (~30%) promove maior fragilização da matriz polimérica. Palavras-chave: Compósito termoplástico, PPS, poli(sulfeto de fenileno), consolidação em autoclave. Evaluation of Thermal and Mechanical Behaviors of PPS/Carbon Fiber Laminates Processed in Autoclave Under Different Consolidation CyclesAbstract: One of the most used processes to obtain structural thermoplastic parts is the hot compression molding, which is limited to small and medium size parts because of the size of the press used, mainly related to its cost. This has hampered a wide use of thermoplastic composites in structural applications. In order to extend the application of thermoplastic composites, but still using available infrastructure in composite manufacturers, in this work we investigate the processing of carbon fiber reinforced polyphenylene sulfide (PPS) in an autoclave, using four consolidation cycles. The processed laminates were characterized by ultrasound inspection, DSC analyses for the crystallinity determination and mechanical tests to evaluate the compression, flexure and interlaminar shear strength (ILSS). The results show that the laminates obtained under the lowest cooling rate exhibited the lowest compressive strength and modulus, because of the higher crystallinity degree (~30%) that turns the matrix more brittle. Keywords: Thermoplastic composite, PPS, polyphenylene sulfide, consolidation in autoclave. IntroduçãoNa indústria aeronáutica, os materiais compósitos poliméricos surgem como uma alternativa às estruturas metálicas tradicionalmente utilizadas desde o início da aviação. Os materiais compósitos, com suas variadas combinações de matriz e reforço, conferem à estrutura menor peso em relação às estruturas metálicas, consequentemente, maiores resistência mecânica e rigidez específicas. A obtenção de componentes com esse tipo de material possibilita, ainda, uma maior integração de peças, um menor custo de fabricação e maiores re...

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Fractography of Composite Materials

Franco

2012

Wiley Encyclopedia of Composites

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The advent of composite materials and the knowledge acquired in the recent years in this area has increased the performance of the aeronautical industries' products. As the structural applications for fiber‐reinforced polymeric composites continue to increase, so too does the need for a thorough understanding of the fundamental failure processes in the different materials systems. To understand the mechanisms governing the behavior and failure processes of fiber‐reinforced plastics composites, it is necessary to know the origin and subsequent development of specific fracture features. With this knowledge, the mode of fracture, the overall direction of crack propagation, and ultimately the origin and sequence of structural failure may be ascertained. The study of fracture surfaces or fractography as it is more commonly known has been applied to continuous fiber‐reinforced plastics (CFRP), for over 20 years, and much work has been done during this time. But more is needed if a fundamental understanding and a database of the mechanisms and characteristics of fracture for different composite systems are to be established. In this article, the fracture behavior of carbon fiber‐reinforced thermoplastic and thermosetting polymer composites was evaluated as a result of fracture under different environmental conditioning and mechanical tests. Fatigue, longitudinal and transversal tension, compression, and “short beam shear test” were carried out. Tests were conducted at different temperatures (from—55 to 80°C) under various percentages of moisture‐absorbed contents (totally dry to saturated condition). A fractographic analysis was made to help in the understanding of the failure mode and reveals by the analysis of the fracture surface, the dominant mode of failure in every temperature‐moisture content pair for each mechanical test. The main issue of this work is the use of fractography to understand the relation between the environmental conditioning, the mechanical test, the degradation of the composite (interface, matrix degradation), and the fracture surface.

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Influence of temperature on the behavior of carbon fiber fabrics reinforced PPS laminates

Cited by 52 publications

References 13 publications

Correlation between degree of crystallinity, morphology and mechanical properties of PPS/carbon fiber laminates

Correlation between degree of crystallinity, morphology and mechanical properties of PPS/carbon fiber laminates

Avaliação dos comportamentos mecânico e térmico de laminados de PPS/fibra de carbono processados em autoclave sob diferentes ciclos de consolidação

Fractography of Composite Materials

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