A Comparison of Bending Properties for Cellular Core Sandwich Panels

Li Yang, Ola Harrysson, Harvey West, Denis Cormier

Department of Industrial & Systems Engineering, North Carolina State University, Raleigh, USA.
Department of Industrial & Systems Engineering, Rochester Institute of Technology, Rochester, USA.
Department of Industrial Engineering, University of Louisville, Louisville, USA.

DOI: 10.4236/msa.2013.48057                

Abstract

In this study, various sandwich panel structures with different reticulate lattice core geometries were designed and then fabricated in titanium via the electron beam melting (EBM) process. Bending tests were performed on the titanium samples, and mechanical properties such as modulus, bending strength, and energy absorption were evaluated. Different failure mechanisms were observed, and it was found that sandwich structures with auxetic cores exhibited more homogeneous deflection and bending compliance compared with other structures. It was also demonstrated that properties of auxetic sandwich structures can be tailored using different cell structure geometries 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.

Keywords

Auxetic Structure; Cellular Structure; Sandwich Panels; Electron Beam Melting; Bending Properties

Conflicts of Interest

The authors declare no conflicts of interest.

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