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.
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