In this study, various sandwich panel structures with different reticulate lattice core geometrieswere designed and then fabricatedin titanium via the electron beam melting (EBM) process. Bending testswere performed on the titanium samples, and mechanical properties such as modulus, bending strength, and energy absorptionwere evaluated. Different failure mechanisms were observed, and it was found that sandwich structures with auxetic cores exhibitedmore homogeneous deflection and bending compliance compared with other structures. It was also demonstrated that properties of auxetic sandwich structurescan be tailored using different cell structuregeometries to suit the needs of a given design application.Furthermore, it was found that other 3D cellular sandwich structures can also exhibit high stiffness and strength, which is desirable in potential applications.
Cite this paper
L. Yang, O. Harrysson, H. West and D. Cormier, "A Comparison of Bending Properties for Cellular Core Sandwich Panels," Materials Sciences and Applications, Vol. 4 No. 8, 2013, pp. 471-477. doi: 10.4236/msa.2013.48057.
 H. G. Allen, “Analysis and Design of Structural Sandwich Panels,” Pergamon Press, Oxford, 1969.
 R. Lakes, “Foam Structures with a Negative Poisson’s Ratio,” Science, Vol. 235, No. 4792, 1987, pp. 1038-1040.
 F. Scarpa and P. J. Tomlin, “On the Transverse Shear Modulus of Negative Poisson’s Ratio Lattice Structures,” Fatigue & Fracture of Engineering Materials & Structures, Vol. 23, No. 8, 2000, pp. 717-720.
 F. Scarpa and G. Tomlinson, “Theoretical Characteristics of the Vibration of Sandwich Plates with In-Plane Negative Poisson’s Ratio Values,” Journal of Sound and Vibration, Vol. 230, No. 1, 2000, pp. 45-67.
 T. M. McCormack, R. Miller, O. Kesler and L. J. Gibson, “Failure of Sandwich Beams with Metallic Foam Cores,” International Journal of Solids and Structures, Vol. 38, No. 28, 2001, pp. 4901-4920.
 O. Kesler and L. J. Gibson, “Size Effects in Metallic Foam Core Sandwich Beams,” Materials Science and Engineering: A, Vol. 326, No. 2, pp. 228-234.
 C. Chen, A.-M. Harte and N. A. Fleck, “The Plastic Collapse of Sandwich Beams with a Metallic Foam Core,” International Journal of Mechanical Sciences, Vol. 43, No. 6, 2001, pp. 1483-1506.
 K. E. Evans, “The Design of Doubly Curved Sandwich Panels with Honeycomb Cores,” Composite Structures, Vol. 17, No. 2, 1991, pp. 95-111.
 R. Lakes, “Advances in Negative Poisson’s Ratio Materials,” Advanced Materials, Vol. 5, No. 4, 1993, pp. 293-296. doi:10.1002/adma.19930050416
 L. Yang, D. Cormier, H. West and K. Knowlson, “NonStochastic Ti-6Al-4V Foam Structure That Shows Negative Poisson’s Ratios,” Materials Science and Engineering: A, Vol. 558, 2012, pp. 579-585.
 L. Yang, O. Harrysson, D. Cormier and H. West, “Compressive Properties of Ti-6Al-4V Auxetic Mesh Structures Made by EBM Process,” Acta Materialia, Vol. 60, No. 8, 2012, pp. 3370-3379.
 L. Yang, O. Harrysson, D. Cormier and H. West, “Modeling of the Uniaxial Compression of a 3D Periodic ReEntrant Honeycomb Structure,” Journal of Materials Science, Vol. 48, No. 4, 2012, pp. 1413-1422.
 O. L. A. Harrysson, O. Cansizoglu, D. J. Marcellin-Little, D. Cormier and H. West II, “Direct Metal Fabrication of Titanium Implants with Tailored Materials and Mechanical Properties Using Electron Beam Melting Technology,” Materials Science and Engineering: C, Vol. 28, No. 3, 2008, pp. 366-373. doi:10.1016/j.msec.2007.04.022
 O. Cansizoglu, O, Harrysson, D. Cormier, H. West and T. Mahale, “Properties of Ti-6Al-4V Non-Stochastic Lattice Structures Fabricated via Electron Beam Melting,” Materials Science and Engineering: A, Vol. 492, No. 1-2, 2008, pp. 468-474.
 O. Cansizoglu, “Mesh Structures with Tailored Properties and Applications in Hip Stems,” Ph.D. Dissertation, North Carolina State University, Raleigh, 2008.
 L. J. Gibson, “Cellular Solids: Structure and Properties,” 2nd Edition, Cambridge University Press, New York, 1997.