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A procedure is proposed for determining the impact resistance of composite materials based on glass-and carbon-reinforced plastics and adhesive materials used as binders. Characteristics of the impact resistance are determined using a pendulum tester upon impact by a spherical steel indenter. It is shown that the most informative characteristic for estimating the impact resistance of composites is the work absorbed by the material upon impact. For comparative estimation of the impact resistance of different materials, whose specimens may have different thicknesses, it is convenient to use relative rather than absolute values of impact resistance. The relative value is calculated by dividing the maximum contact force by the specimen thickness. Glass-fiber laminates based on adhesive prepregs 1.9 and 2.1 mm thick and three-layer honeycomb panels were tested. Materials based on KMKS 2.120.T10 adhesive prepreg possess the best impact resistance.

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