A viable model for out-of-plane compressive and shear properties of Z-pin reinforced composite sandwich panels

Abstract

This paper attempts at developing a computational-analytical model to represent the behavior of Z-pin reinforced X-Cor composite sandwich panels under out-of-plane compression and shear loading. Parameters important in representing the behavior of the individual components of the sandwich are identified. The softening of Z-pins under compression from geometric and material imperfections, densification of the foam, and pin-facesheet interface strengths are incorporated into the model. For validation, the values of the parameters are obtained from experiments performed in house, and then for comparison, they are used to estimate the stiffness and strength of the specimens with experimentally obtained results reported in an open literature. Good correlation using these parameters across different specimens has implications on development of a predictive methodology for the behavior of Z-pin reinforced sandwich materials under compression and shear.

Keywords

X-Cor sandwich mechanical model out-of-plane compressive and shear stiffness and strength

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References

Seibert

. Applications for PMI foams in aerospace sandwich structures. Reinf Plast 2006; 50: 44–48.

Hamed

Rabinovitch

. Modeling and dynamics of sandwich beams with a viscoelastic soft core. AIAA J 2009; 47: 2194–2211.

Kardomateas

Frostig

Phan

. Dynamic elasticity solution for the transient blast response of sandwich beams/wide plates. AIAA J 2013; 51: 485–491.

Rakow

Waas

. Response of actively cooled metal foam sandwich panels exposed to thermal loading. AIAA J 2007; 45: 329–336.

Basu

Waas

Ambur

. Computational modeling of damage growth in composite laminates. AIAA J 2003; 41: 1158–1166.

Icten

Sayman

. Failure analysis of pin-loaded aluminum–glass–epoxy sandwich composite plates. Compos Sci Technol 2003; 63: 727–737.

Sleight DW and Wang JT. Buckling analysis of debonded sandwich panel under compression. NASA Technical Memorandum 4701.

Schultz

Oremont

Guzman

et al.

Compression response of fluted-core composite panels. AIAA J 2012; 50: 2546–2557.

Nanayakkara

Feih

Mouritz

. Experimental analysis of the through-thickness compression properties of Z-pinned sandwich composites. Compos Part A 2011; 42: 1673–1680.

10.

Chang

Mouritz

Cox

. Flexural properties of Z-pinned laminates. J Compos Part A 2007; 38: 244–251.

11.

Jiao

. Indentation study of Z-pin reinforced polymer foam core sandwich structures. J Compos Part A 2009; 40: 822–829.

12.

Marasco

Cartie

DDR

Partridge

et al.

Mechanical properties balance in novel Z-pinned sandwich panels: out-of-plane properties. J Compos Part A 2006; 37: 295–302.

13.

Mouritz

. Compression properties of Z-pinned sandwich composites. J Mater Sci 2006; 41: 5771–5774.

14.

Wallace

Sankar

Ifju

. Pin reinforcement of delaminated sandwich beams under axial compression. J Sandw Struct Mater 2001; 3: 117, 1530–7972/01/02 0117–13.

15.

Xia

. Study on impact properties of through-thickness stitched foam sandwich composites. J Compos Struct 2010; 92: 412–421.

16.

Zok

Waltner

Wei

et al.

A protocol for characterizing the structural performance of metallic sandwich panels: application to pyramidal truss cores. Int J Solids Struct 2004; 41: 6249–6271.

17.

Cartie

Fleck

. The effect of pin reinforcement upon the through-thickness compressive strength of foam-cored sandwich panels. Compos Sci Technol 2003; 63: 2401–2409.

18.

Liu

Deng

. Analytical modeling and finite element simulation of the plastic collapse of sandwich beams with pin-reinforced foam cores. Int J Solids Struct 2008; 45: 5127–5151.

19.

Sweeting

Thomson

. The effect of thermal mismatch on Z-pinned laminated composite structures. J Compos Struct 2009; 66: 189–195.

20.

Hetenyi M. Beams on elastic foundation, Ann Arbor: University of Michigan Press, 1946.