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Made available in DSpace on 2022-04-28T21:02:09Z (GMT). No. of bitstreams: 0 Previous issue date: 2010-07-01 The impact response of metal-fiber laminates has been investigated. Measurements were obtained for impact force and energy dissipation. The failure processes in the impact-loaded were initially investigated by examining the front and rear surfaces of the damaged specimens. After this, the delamination areas of hybrid composites were analyzed by ultrasound techniques. Considering the metal/polymeric composite interfaces, it was observed that the laminate was processed with good quality and the impact energy transferred into the metal-fiber laminate was higher than the observed in aluminum or traditional composites due to elastic restitution. The parameters used in this work describe the real material behavior and can be used as characteristic values to classify materials with respect to their impact stiffness and damage resistance. EMBRAER, São José dos Campos, São Paulo Department of Materials and Technology São Paulo State University, Guaratinguetá, São Paulo Divisão de Materiais Instituto de Aeronáutica e Espaço CTA, São José dos Campos, São Paulo Department of Materials and Technology São Paulo State University, Guaratinguetá, São Paulo

Made available in DSpace on 2022-04-28T21:50:35Z (GMT). No. of bitstreams: 0 Previous issue date: 2011-01-01 The hygrothermal and UV radiation influences on shear properties and moisture diffusion aging in polyetherimide (PEI) reinforced with continuous fibers were systematically studied in this research, by using ILSS and losipescu shear tests. The moisture weight gain curves of the PEI composites reinforced with glass fiber and carbon fiber were compared in order to determine the interface effect on moisture absorption. Both composites display similar anomalous diffusion behavior; the PEI reinforced with glass fiber presented higher diffusion and water absorption values. The mechanical results Indicate that moisture associated with temperature and UV radiation degrades the shear properties by about 20%, giving evidences of plasticization of PEI matrix. Department of Materials and Technology São Paulo State University, Guaratinguetá, SP Divisão de Materiais/AMR Instituto de Aeronáutica e Espaço (IAE) José Dos Campos, SP Department of Materials and Technology São Paulo State University, Guaratinguetá, SP