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TECHNICAL PAPERS

Low Velocity Impact and Compression-After-Impact Response of Z-Pin Reinforced Core Sandwich Composites

[+] Author and Article Information
U. K. Vaidya

Department of Mechanical Engineering & Applied Mechanics (MEAM), North Dakota State University, Fargo, ND 58103

A. N. Palazotto, L. N. B. Gummadi

Department of Aeronautics and Astronautics, Air Force Institute of Technology (AFIT), WPAFB, OH 45433

J. Eng. Mater. Technol 122(4), 434-442 (Apr 21, 2000) (9 pages) doi:10.1115/1.1289141 History: Received February 07, 2000; Revised April 21, 2000
Copyright © 2000 by ASME
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References

Freitas,  G., Magee,  C., Dardzinski,  P., and Fusco,  T., 1994, “Fiber Insertion Process for Improved Damage Tolerance in Aircraft Laminates,” J. Adv. Mater., 25, No. 4, pp. 36–43.
Herup, E. J., and Palazatto, A. N, 1996, “Low Velocity Impact Damage Initiation in Graphite/Epoxy Nomex Honeycomb Sandwich Plates,” AIAA Paper 96-1519 (A96-26976), 37th AIAA/ASCE/ASME/AHS SDM Conference, pp. 1765–1773.
Herup, E. J., 1996, “Low Velocity Impact on Composite Sandwich Plates,” Ph.D. dissertation, Air Force Institute of Technology, Dayton, Ohio.
Vaidya,  U. K., , 1999, “Low Velocity Impact Response of Laminated Sandwich Composites with Hollow and Foam-Filled Z-Pin Reinforced Core,” J. Compos. Technol. Res., 21, No. 2, Apr., pp. 84–97.
Palazotto,  A., Gummadi,  L. N. B., Vaidya,  U. K., and Herup,  E., 1999, “Low Velocity Impact Damage Characteristics of Z-Fiber Reinforced Sandwich Panels-An Experimental Study,” Compos. Struct., 43, Issue: 4, Feb., pp. 275–288.
Vaidya,  U. K., , “Damage Tolerance of Resin Transfer Molded Sandwich Composite Constructions,” AFRL-VA-WP-TR-1999-3053, Technical Report, WPAFB, Ohio.
Suppliers of Advanced Composite Materials Association (SACMA) 1998.

Figures

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Schematic of sandwich cores
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Experimental results: LVI-Z-pin sandwich plate force-time curves 4
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Experimental results: LVI-Z-pin sandwich plate load-displacement curves 4
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Load versus displacement finite element static analysis
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Load versus pin failures
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Load versus pin failures up to 160 pins
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Load versus pin failures up to 10 pins
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Vertical displacement of top face sheets, force equals 4.39 kN
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Vertical displacement of top face sheets, force equals 4.14 kN
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σyy at a force equal to 4.39 kN
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σyy at a force equal to 4.41 kN
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σxx at a force equal to 4.39 kN
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σxx at a force equal to 4.41 kN
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Dynamic analysis results
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Dynamic analysis results with face sheet failure
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(a) and (b) CAI curves for FCo samples A and D
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(a) and (b) CAI curves for F+PCo-75 samples A and D
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(a) and (b) Compression-after-impact curves for F+PCo-150 samples A and D
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Load Displacement curve for TCo sample

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