SYMPOSIA PAPER Published: 01 January 1992

Damage Tolerance of Three-Dimensional Commingled PEEK/Carbon Composites


The concept of structural toughening of composites by three-dimensional (3-D) fiber architecture is demonstrated. Polyetherketone (PEEK) matrix in filament form was commingled with carbon fiber before preform fabrication and composite consolidation to facilitate matrix introduction into the 3-D fiber network. The effect of matrix viscosity was found to be essential for effective fiber wetting in the 3-D fiber network. The tolerance of 3-D composites to damage induced by open holes and by impact was investigated under tensile and compressive loading. 3-D reinforced composites were found to have higher compression after impact strength and an order of magnitude lower damage area under 13 J/mm impact energy in comparison to laminated PEEK/carbon composites. This high level of damage tolerance is due to the lack of delamination inherent to 3-D reinforced composites.

Author Information

Hua, CT
Boeing Defense and Space Group, Parts, Materials, and Processes, Seattle, WA
Chu, J-N
Drexel University, Fibrous Materials Research Center, Philadelphia, PA
Ko, FK
Drexel University, Fibrous Materials Research Center, Philadelphia, PA
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Developed by Committee: D30
Pages: 400–413
DOI: 10.1520/STP20173S
ISBN-EB: 978-0-8031-5184-0
ISBN-13: 978-0-8031-1426-5