Damage resistance of aluminum core honeycomb sandwich panels with carbon/epoxy face sheets

Abstract

The damage resistance of composite sandwich structures with eight and 16 ply quasi-isotropic, carbon/epoxy face sheets and aluminum honeycomb core is evaluated. The external damage is induced quasi-statically, using spherical steel indentors under displacement control, to be in the vicinity of the barely visible threshold. In addition to the face sheet thickness, other parameters that are varied include the core thickness, core density, face sheet layup, and indentor diameter. The effect of these parameters on the extent of damage is evaluated using the damage metrics of dent depth, dent diameter, and planar area of delamination. When dent depth or dent diameter is considered as the damage metric, specimens containing a higher density core are always found to be the most damage resistant. When planar area of delamination is considered as the damage metric, the eight ply configuration comprised of a lower density core and face sheets containing only small ply angle changes are found to be the most damage resistant. However, this configuration is found to be the least damage resistant when this damage metric is applied to the 16 ply specimens. Rather, the best delamination resistance is provided by a 16 ply configuration with a high density core and face sheets that have ±45° ply groups at the beginning and ending of their stacking sequence.

Keywords

Quasi-static dent delamination core face sheet damage resistance low velocity impact

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References

Abrate

. Localized impact on sandwich structures with laminated facings. Appl Mech Rev 1997; 50: 69–82.

Tomblin JS, Lacy TE, Smith B, et al. Review of damage tolerance for composite sandwich airframe structures. Federal Aviation Administration Report DOT/FAA/AR-99/49, U.S. Department of Transportation, Washington, DC, 1999.

Shyprykevich P, Tomblin JS, Ilcewicz L, et al. Guidelines for analysis, testing, and non-destructive inspection of impact damaged composite sandwich structures. Federal Aviation Administration Report DOT/FAA/AR-02/121, U.S. Department of Transportation, Washington, DC, 2003.

Sjoblom

Hartness

Cordell

. On low-velocity impact testing of composite materials. J Compos Mater 1988; 22: 30–52.

Abrate

. Impact on laminated composite materials. Appl Mech Rev 1991; 44: 155–190.

Kim

Jun

. Impact resistance of composite laminated sandwich plates. J Compos Mater 1992; 26: 2247–2261.

Zhou

Hill

Loughlan

. Damage characteristics of composite honeycomb sandwich panels in bending under quasi-static loading. J Sandwich Struct Mater 2006; 8: 55–90.

Xue

Hutchinson

. A comparative study of impulse-resistant metallic sandwich plates. Int J Impact Eng 2004; 30: 1283–1305.

Fleck

Deshpande

. The resistance of clamped sandwich beams to shock loading. J Appl Mech 2004; 71: 386–401.

10.

Schoeppner

Abrate

. Delamination threshold loads for low velocity impact on composite laminates. Compos Part A 2000; 31: 903–915.

11.

Liu

Chang

. Matrix cracking effect on delamination growth in composite laminates induced by a spherical indenter. J Compos Mater 1994; 28: 940–977.

12.

Liu

. Impact-Induced delamination – a view of bending stiffness mismatching. J Compos Mater 1988; 22: 674–692.

13.

Davidson

Michaels

Sundararaman

. Ultrasonic imaging of impact damaged composite panels. Acoust Imaging 1992; 19: 589–594.

14.

Michaels

Davidson

. Ultrasonic inspection detects hidden damage in composite materials. Adv Mater Processes 1993; 143: 34–38.

15.

Park

Kang

. Impact damage resistance of sandwich structure subjected to low velocity impact. J Mater Process Technol 2008; 201: 425–430.

16.

Ferri

Sankar

. A comparative study on the impact resistance of composite laminates and sandwich panels. J Thermoplast Compos Mater 1997; 10: 304–315.

17.

Williamson JE and Lagace PA. Response mechanisms in the impact of graphite/epoxy honeycomb sandwich panels. In: Proceedings of the American Society for Composites eighth technical conference on composite materials, Cleveland, OH, 19–21 October 1993, pp.287–297.

18.

Zhou

Hill

Loughlan

. Damage characteristics of composite honeycomb sandwich panels in bending under quasi-static loading. J Sandwich Struct Mater 2006; 8: 55–90.

19.

Flores-Johnson

. Experimental study of indentation of sandwich panels with carbon fibre-reinforced polymer face sheets and polymeric foam core. Compos Part B 2011; 42: 1212–1219.

20.

Zhou

Hill

Hookman

. Investigation of parameters governing the damage and energy absorption characteristics of honeycomb sandwich panels. J Sandwich Struct Mater 2007; 8: 309–342.

21.

Singh

Davidson

Eisenberg

. Damage characterization of quasi-statically indented composite sandwich structures. J Compos Mater 2013; 47: 1211–1229.

22.

Raju

Smith

Tomblin

. Impact damage resistance and tolerance of honeycomb core sandwich plates. J Compos Mater 2008; 42: 385–412.

23.

Tsotsis

Lee

. Characterisation of localized failure modes in honeycomb sandwich panels using indentation. Compos Mater Test Des ASTM STP 1996; 1274: 139–165.

24.

Herup

Palazotto

. Low-velocity impact damage initiation in graphite/epoxy/nomex honeycomb-sandwich plates. Compos Sci Technol 1997; 57: 1581–1598.

25.

Anderson

Madenci

. Experimental investigation of low-velocity impact characteristics of sandwich composites. Compos Struct 2000; 50: 239–247.

26.

Palm TE. Impact resistance and residual compression strength of composite sandwich panels. In: Proceedings of the 8th International Conference on Composite Materials (ICCM/8), Honolulu, HI, 15–19 July 1991, 3-G-1–3-G-14.

27.

Meo

Vignjevic

Marengo

. The response of honeycomb sandwich panels under low-velocity impact loading. Int J Mech Sci 2005; 47: 1301–1325.

28.

Hong

Liu

. On the relationship between impact energy and delamination area. Exp Mech 1989; 29(2): 115–120.

29.

Bernard

Lagace

. Impact resistance of composite sandwich plates. J Reinf Plastics Compos 1989; 8: 432–445.

30.

Oplinger

Slepetz

Impact damage tolerance of graphite/epoxy panels. In: Greszczuk

(ed.). Foreign object impact damage to composites. ASTM STP 568, West Conshohocken, PA: ASTM, 1975, pp. 30–48.

31.

Czabaj MW, Zehnder AT, Davidson BD, et al. Compression strength of honeycomb-stiffened graphite/epoxy panels with barely visible indentation damage. J Compos Mater. 2014; 48(20): 2455–2471.

32.

Hasseldine BPJ, Zehnder AT, Keating B, et al. Compression after impact of thick sandwich composite structures. In: Proceedings of the 54th AIAA structures, structural dynamics, and materials conference, Boston, MA, 8–11 April 2013, pp.1689–1700.