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Effect of Matrix Resin on the Impact Fracture Characteristics of Graphite-Epoxy Laminates.

P. E. Hertzberg, B. W. Smith, A. G. Miller

Abstract

The effect of resin chemistry on basic impact energy absorbent mechanisms exibited by graphite-epoxy composites was investigated. Impact fracture modes and microscopic resin deformation characteristics were examined for 26 NASA-impacted graphite epoxy laminates with different resin chemistries. Discrete specimen fracture modes were identified through cross sectional examination after impact, and subsequently compared with measured glass transition temperatures, cure cycles, and residual impact capabilities. Microscopic resin deformation mechanisms and their overall relationship to impact loading conditions, voids, and resin content were also characterized through scanning electron microscopic examination of separated fracture surfaces.

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Key concepts: Epoxy, Composite material, Materials science, Fracture (geology), Graphite, Deformation (meteorology), Scanning electron microscope, Matrix (chemical analysis)