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Journal of Materials Science

, Volume 43, Issue 9, pp 3267–3273 | Cite as

Edge effects in compression testing periodic cellular metal sandwich cores

  • B. A. BouwhuisEmail author
  • E. Bele
  • G. D. Hibbard
Article

Abstract

Compression testing of cellular sandwich core materials is often complicated by the presence of edge effects, in which the cells on the outside of the specimen deform at lower stresses than those in the bulk. As a result, minimum specimen length-to-cell-size ratios have been established in the literature for metallic foams. Periodic cellular metals (PCMs) are a recently developed class of materials that have received considerable interest due to their greater architectural efficiency and enhanced mechanical properties compared to conventional metal foams. In this study, edge effects of PCM core materials have been measured in compression using a new test platform which evaluates the properties of the core as a stand-alone material. This approach introduces uniform and periodically rigid boundary conditions to the PCM nodes, resulting in the same inelastic buckling failure mechanism that occurs in reference PCM sandwich panels. Edge effects were comparatively small and samples down to 2 × 2 unit cells were found to be representative of bulk-like cores.

Keywords

Foam Edge Effect Sandwich Panel Tetrahedral Unit Truss Core 

Notes

Acknowledgements

The authors would like to acknowledge the National Science and Engineering Research Council of Canada (NSERC) for funding. One of the authors, B.A.B. is also supported by an Ontario Graduate Scholarship for Science and Technology (OGSST).

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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  1. 1.Department of Materials Science and EngineeringUniversity of TorontoTorontoCanada

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