Effect of Matrix Resin on the Impact Fracture Characteristics of Graphite-Epoxy Laminates.
BOEING COMMERCIAL AIRPLANE CO SEATTLE WA
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This report presents the results of an investigation into the effect of resin chemistry on basic impact-energy-absorbent mechanisms exhibited by graphite-epoxy composites. 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. Details of microscopic resin deformation mechanisms and their overall relationship to impact loading conditions, voids, and resin content also were characterized through detailed scanning electron microscopic examination of separated fracture surfaces. MM
- Laminates and Composite Materials