Método Experimental de Análisis de las Juntas Híbridas de Estructuras Aeronáuticas
DOI:
https://doi.org/10.22480/revunifa.2011.24.720Palabras clave:
Juntas metal-material compuesto, Juntas mecánicas, Estructuras aeronáuticas en material compuesto, método experimentalResumen
Juntas estructurales de metal-compuesto es un desafío para diseño y análisis de estructuras aeronáuticas. En este trabajo se presenta una nueva metodología para análisis experimental en juntas compuestas por metal-material compuesto unidas por elementos fijación mecánico. Para esto fueron analizadas juntas, unidas por remaches de Monel, fabricadas con chapa metálica de titanio unida a placa de material compuesto de fibra de carbono y resina Epoxi. Las juntas estudiadas son de tipo simple e fueron sometidas a cizallamiento simple. Para esto fueron fabricadas probetas de material compuesto fibra de carbono-Epoxi, siguiendo las especificaciones de las normas ASTM-D3039 y ASTM-D3518. Los ensayos de tracción y cizallamiento de las probetas de material compuesto posibilitaron determinar las propiedades mecánicas así como valores admisibles de la tensión y deformación. Con estas informaciones fue posible generar modelos computacionales solucionados por Métodos de Elementos Finitos. Estas simulaciones computacionales siguieron las especificaciones norma ASTM-D5961, con el objetivo e proporcionar una buena estrategia para la realización de los ensayos. Ensayos experimentales se realizaron con las especificaciones de la geometría norma ASTM-D5961 (compuesto-compuesto) y método del módulo secundario MIL-HDBK-5J (metal-metal), proponiéndose así una metodología de ensayos para juntas metal-materia compuesto. Se verificó que las juntas donde en material compuesto posee capas orientadas a 0°/90°, fallaron por net-tensión, mientras que las juntas con camadas orientadas 45 fallaron por tear-out. De esta manera, el método experimental propuesto además de ofrecer un abordaje eficaz para obtener las propiedades mecánicas de juntas metal-compuesto también posibilita la evaluación del modo de falla de la junta.
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Derechos de autor 2011 Ricardo de Medeiros Volnei Tita, Silvio Venturini Neto
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