Impact-Damaged Graphite-Thermoplastic Trapezoidal-Corrugation Sandwich and Semi-Sandwich Panels

Abstract

The results of a study of the effects of impact damage on compression- loaded trapezoidal-corrugation sandwich and semi-sandwich graphite-thermoplastic panels are presented. Sandwich panels with two identical face sheets and a trapezoidal corrugated core between them, and semi-sandwich panels with a corrugation attached to a single skin are considered in this study. Panels were designed, fabricated and tested. The panels were made using the manufacturing process of thermoforming, a less-commonly used technique for fabricating composite parts. Experimental results for unimpacted con trol panels and panels subjected to impact damage prior to loading are presented. Little work can be found in the literature about these configurations of thermoformed panels.

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References

Williams, J.G. , M.S. Anderson , M.D. Rhodes , J.H. Starnes, Jr and W.J. Stroud. 1980. "Recent Developments in the Design, Testing and Impact-Damage Tolerance of Stiffened Composite Panels," Fibrous Composites in Structural Design, E. M Leneo, D. W. Oplinger and J. J. Burke, eds., New York: Plenum Publishing Corporation, pp. 259-291.

Rhodes, M.D. , J.G. Williams and J.H. Starnes, Jr. 1977. "Effect of Low-Velocity Impact Damage on the Compressive Strength of Graphite-Epoxy Hat-Stiffened Panels," NASA TN D-8411

Jegley, D.C. 1992. "A Study of Compression-Loaded and Impact-Damaged Structurally Efficient Graphite-Thermoplastic Trapezoidal-Corrugation Sandwich and Semi-Sandwich Panels," NASA TP-3269

Starnes, J.H., Jr , M.D. Rhodes and J.G. Williams 1979. "Effect of Impact Damage and Holes on the Compression Strength of a Graphite/Epoxy Laminate," Nondestructive Evaluation and Flaw Criticality for Composite Materials, ASTM STP 696, R B. Pipes, ed, pp 145-171