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    STP1120

    Damage Tolerance of Three-Dimensional Commingled PEEK/Carbon Composites

    Published: 0


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    Abstract

    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.

    Keywords:

    three-dimensional braid, angle-ply laminates, thermoplastics, commingled yarns, compression after impact strength, damage tolerance, failure mode, open hole compressive strength, open hole tensile strength


    Author Information:

    Hua, CT
    Senior engineer, Boeing Defense and Space Group, Parts, Materials, and Processes, Seattle, WA

    Chu, J-N
    Graduate studentprofessor, Drexel University, Fibrous Materials Research Center, Philadelphia, PA

    Ko, FK
    Graduate studentprofessor, Drexel University, Fibrous Materials Research Center, Philadelphia, PA


    Committee/Subcommittee: D30.05

    DOI: 10.1520/STP20173S