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Authors
Advisor(s)
Abstract(s)
Os materiais compósitos laminados com reforço de fibras longas, sob a forma unidirecional ou tecido, são utilizados em inúmeras aplicações que podem ir desde a conceção, a construção e a reparação de componentes e sistemas no âmbito das mais variadas indústrias.
Consoante o tipo de aplicação dos materiais compósitos, poderemos estar perante a necessidade de se recorrer a um processo de ligação que implique a necessidade de furação destes. Esta operação para além de fragilizar a zona onde é realizada, poderá provocar danos no laminado e em consequência acelerar a sua degradação até ocorrer falha.
Neste trabalho são estudas diferentes técnicas de análise não destrutivas (digitalização passiva (scan), raio-X e termografia passiva) bem como diferentes condições de furação desde a furação de diferentes espessuras, furação com diferentes ferramentas utilizando os mesmos parâmetros, furação de diferentes tamanhos de fibra (fibra curta e fibra longa)
e utilização de diferentes parâmetros de furação de modo a que se possa aferir em que condições o dano induzido é menor, tendo por base modelos matemáticos de quantificação do dano induzido pela furação de materiais compósitos.
Laminated composites materials with long fiber reinforcement, in a unidirectional form or woven, are used in numerous applications ranging from the design, construction and repair of components and systems in the most varied industries. Depending on the characteristics of the application, we may be facing a process of connection between components constructed with these materials, which imply the need to drill them. This operation, in addition to weakening the area where it is carried out, may cause damage to the laminate and consequently accelerate its degradation until failure occurs. In this work, several drilling conditions are studied, from the drilling of different thicknesses, drilling with different tools using the same parameters, drilling of different types of fiber (short fiber and long fiber) and use of different drilling parameters in order to can verify under what conditions the induced damage is smaller using mathematical models of the quantification of the damage induced by the drilling of composite materials taking into account the images obtained through non-destructive analysis techniques (passive scanning, x-ray and passive thermography) during the drilling tests described in the present work.
Laminated composites materials with long fiber reinforcement, in a unidirectional form or woven, are used in numerous applications ranging from the design, construction and repair of components and systems in the most varied industries. Depending on the characteristics of the application, we may be facing a process of connection between components constructed with these materials, which imply the need to drill them. This operation, in addition to weakening the area where it is carried out, may cause damage to the laminate and consequently accelerate its degradation until failure occurs. In this work, several drilling conditions are studied, from the drilling of different thicknesses, drilling with different tools using the same parameters, drilling of different types of fiber (short fiber and long fiber) and use of different drilling parameters in order to can verify under what conditions the induced damage is smaller using mathematical models of the quantification of the damage induced by the drilling of composite materials taking into account the images obtained through non-destructive analysis techniques (passive scanning, x-ray and passive thermography) during the drilling tests described in the present work.
Description
Trabalho Final de Mestrado para obtenção do grau de Mestre
em Engenharia Mecânica Ramo de Manutenção e Produção
Keywords
Compósitos laminados Furação Dano Termografia Raio-X Processamento de imagem Laminated Composites Drilling Damage Thermography X-ray Digital Image Processing
Citation
ALVES, Marisa Sofia Faria – Caracterização do dano induzido por furação de materiais compósitos laminados. Lisboa: Instituto Superior de Engenharia de Lisboa, 2017. Dissertação de Mestrado.
Publisher
Instituto Superior de Engenharia de Lisboa