STP972: Effect of Adhesive Layers on Impact Damage in Composite Laminates

    Sun, CT
    Professor, School of Aeronautics and Astronautics, Purdue University, West Lafayette, IN

    Rechak, S
    Professor, School of Aeronautics and Astronautics, Purdue University, West Lafayette, IN

    Pages: 27    Published: Jan 1988


    Abstract

    Adhesive layers were included along the interfaces of a baseline graphite/epoxy [05/905/05] laminate for impact study. Impacted specimens were sectioned longitudinally and transversely for observation of the damage modes. The existence of adhesive layers resulted in the following effects: delamination was effectively suppressed up to very high impact velocities; matrix cracking in the upper lamina was greatly reduced; and the contact area appreciably increased thereby reducing the stress concentration effect. An apparent disadvantage in using adhesive layers was found; that is, the bending crack in the bottom lamina which could branch out into delamination cracks when adhesive layers were absent tended to penetrate the middle lamina and break fibers.

    Keywords:

    composite laminates, impact, delamination, matrix cracks, adhesive layer, contact force, contact law


    Paper ID: STP26130S

    Committee/Subcommittee: D30.02

    DOI: 10.1520/STP26130S


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