The residual tensile and compressive strengths of specimens cut from composite plates subjected to repeated impact at various energy levels were measured. The 16-ply quasi- isotropic composite plates were 2 mm thick, fabricated from Hercules AS4/3501-6 car bon/epoxy prepreg. Impact energy level and number of impacts were found to be major factors influencing strength degradation. However, strength degradation was limited to the region near the impact point.
Cantwell, W.J. , P.T. Curtis and J. Morton "An Assessment of the Impact Performance of CFRP Reinforced with High-Stram Carbon Fibres,"Composites Science and Technology , 25:133-148 (1986)
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Lal, K.M."Residual Strength Assessment of Low Velocity Impact Damage of Graphite-Epoxy Laminates,"J. of Reinforced Plastics and Composites , 2:226-238 (1986)
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. Cantwell, W. , P. Curtis and J. Morton."Post-Impact Fatigue Performance of Carbon Fibre Laminates with Non-Woven and Mixed-Woven Layers,"Composites, 14:301-305 (1983)
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Joshi, S.P. and C.T. Sun."Impact Induced Fracture in a Laminated Composite,"J. of Composite Materials, 6:51-66 (1985)
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. Caprino, G.I.Crivelli Visconti and A. D'Ilio."Elastic Behavior of Composite Structures Under Low Velocity Impact,"Composites, 15.231-234 (1984)
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. Wardle, M.W. and E.W. Tokarsky."Drop Weight Impact Testing of Lammates Reinforced with Kevlar Aramid Fiber, E-Glass, and Graphite,"Composites Technology Review, 5(1):4-10 (Spring 1983)
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. Winkel, J.D. and D.F. Adams."Instrumented Drop Weight Impact Testing of Cross-Ply and Fabric Composites,"Composites , 16:268-278 (1985)
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. Leach, D.C. and D.R. Moore."Toughness of Aromatic Polymer Composites Reinforced with Carbon Fibres,"Composites Science and Technology, 23:131-161 (1985)
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. Lal, K.M."Relationship Between Phase Difference and Coefficient of Restitution During Low Velocity Foreign Object Transverse Damage of Composite Plates,"Composites Technology Review, 6(3):109-111 (Fall 1984)
18.
. Lal, K.M."Coefficient of Restitution for Low Velocity Transverse Impact of Thin GraphiteEpoxy Laminates,"Composites Technology Review, 6(3):112-117 (Fall 1984 )
19.
. Lal, K.M."Low Velocity Transverse Impact Behavior of 8-Ply, Graphite-Epoxy Laminates,"J. of Reinforced Plastics and Composites , 2:216-225 (1986)
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. "Standard Tests for Toughened Resin Composites-Revised Edition,"NASA Reference Publication 092, ACEE Composites Project Office, NASA-Langley Research Center, Hampton, Virginia (July 1983).
21.
Wyrick, D.A. and D.F. Adams."The Effects of Repeated Impact on a Carbon/Epoxy Composite Material," Report No. UWME-DR-701-101-0, Department of Mechanical Engineering, University of Wyoming, Laramie, Wyoming (March 1987).
