| IAEA-CN-115-29 · Effects of Electron Beam Irradiation on Carbon Fiber Tensile Properties C. Giovedi1, L. D. B. Machado2, E. S. Pino2, M. Augusto1, O. Carvalho1
1Centro Tecnológico da Marinha em São Paulo (CTMSP), Av. Prof. Lineu Prestes, 2468,
Cidade Universitária, 05508-000, São Paulo, SP, Brazil
2Instituto de Pesquisas Energéticas e Nucleares (IPEN/CNEN-SP), Av. Prof. Lineu Prestes,
2242, Cidade Universitária, 05508-000, São Paulo, SP, Brazil
Abstract: Carbon fibers are used as reinforcement material in epoxy matrix in advanced composites. An important
aspect of the mechanical properties of composites is associated to the adhesion between the surface of the carbon
fiber and the epoxy matrix. This paper aimed to the evaluation of the effects of EB irradiation on the tensile
properties of resin-impregnated specimens obtained from two commercial carbon fibers (6k and 12k). EB radiation
was applied in two conditions: on the carbon fiber itself before preparing resin-impregnated specimens for
mechanical testing and directly on the final test specimens. Experimental results showed that EB irradiation
improved the tensile strength of carbon fibers in the studied conditions for test specimens prepared from irradiated
fibers. Furthermore, SEM observations have shown that EB irradiation promoted significant changes in the failure
mode.
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