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Abstract(s)
A aplicação dos materiais compósitos tem vindo a crescer dia após dia nos mais variados campos, incluindo o campo médico. Neste caso particular, o desenvolvimento de novas técnicas cirúrgicas, implantes ou tratamentos com maior eficiência só são possíveis com um maior conhecimento dos biomateriais existentes, ao nível do seu desempenho em serviço, ou então com o desenvolvimento de novos biomateriais. Contudo, para o seu desempenho em serviço torna-se muitas vezes necessário serem sujeitos a processos de esterilização/desinfeção. O vapor quente sob pressão revela-se, neste caso, o método mais eficaz na esterilização de materiais médico-hospitalares do tipo crítico, devido à sua não toxicidade e de baixo custo. Vulgarmente este tipo de processo é realizado com recurso aos autoclaves.
Neste contexto, o presente trabalho estuda o efeito da esterilização por autoclave na resistência ao impacto de um compósito hibrido carbono/Kevlar/resina epóxi, uma vez que este tipo de carregamento promove reduções significativas da resistência residual à tração, compressão e flexão. O benefício do uso de uma resina reforçada por nanoclays também foi estudado.
Verificou-se que, independentemente do laminado, a esterilização por autoclave diminui a resistência ao impacto destes laminados. A degradação resulta da ação conjunta temperatura/humidade. No entanto, a resina reforçada com nanoclays promove benefícios ao nível da energia restituída e da vida de fadiga. Finalmente estabeleceu-se modelos de previsão com base nas curvas obtidas.
The application of composite materials has been growing day by day in various fields, including the medical field. In this particular case, the development of new surgical techniques, implants or treatments with high efficiency are possible only with a better understanding of existing biomaterials, the level of their performance in service, or to the development of new biomaterials. However, for your service performance becomes often necessary to undergo the sterilization processes/disinfection. The hot steam under pressure reveals itself, in this case, the most effective method to sterilize medical and hospital-type critical due to its non-toxicity and low cost. Commonly this kind of process is performed with use of autoclaves. In this context, the present study examines the effect of sterilization by autoclaving in the impact strength of a composite hybrid carbon/Kevlar/epoxy resin, since this type of loading promotes significant reductions in residual resistance to traction, compression and bending. The benefit of using a resin reinforced with nanoclays was also studied. It was observed that, regardless of the laminate sterilization by autoclave decreases the impact resistance of these laminates. The degradation results from the action joint temperature / humidity. However, the resin reinforced with nanoclays promotes benefits in terms of energy restored and fatigue life. Finally settled forecasting models based on the curves obtained.
The application of composite materials has been growing day by day in various fields, including the medical field. In this particular case, the development of new surgical techniques, implants or treatments with high efficiency are possible only with a better understanding of existing biomaterials, the level of their performance in service, or to the development of new biomaterials. However, for your service performance becomes often necessary to undergo the sterilization processes/disinfection. The hot steam under pressure reveals itself, in this case, the most effective method to sterilize medical and hospital-type critical due to its non-toxicity and low cost. Commonly this kind of process is performed with use of autoclaves. In this context, the present study examines the effect of sterilization by autoclaving in the impact strength of a composite hybrid carbon/Kevlar/epoxy resin, since this type of loading promotes significant reductions in residual resistance to traction, compression and bending. The benefit of using a resin reinforced with nanoclays was also studied. It was observed that, regardless of the laminate sterilization by autoclave decreases the impact resistance of these laminates. The degradation results from the action joint temperature / humidity. However, the resin reinforced with nanoclays promotes benefits in terms of energy restored and fatigue life. Finally settled forecasting models based on the curves obtained.
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Keywords
Compósitos híbridos - Propriedades mecânicas Nanoclays Autoclave - Esterilização Materiais médico-hospitalares - Esterilização
Citation
Publisher
Universidade da Beira Interior