A numerical and experimental approach to characterize the failure modes of hexagonal cell honeycomb core under in-plane loading

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Authors
Shahverdi Moghaddam, Hooman
Keshavanarayana, Suresh R.
Yang, Chihdar Charles
Horner, Allison L.
Issue Date
2017-10
Type
Conference paper
Language
en_US
Keywords
Fracture , Compression loading , Experimental approaches , Failure envelope , Hexagonal cells , Honeycomb core , Inplane loading , Structural applications , Tensile loading , Coremaking , Failure modes , Honeycomb structures
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Abstract

In the present study, the failure modes of a hexagonal cell honeycomb core under in-plane loading are investigated. It is shown that, under tensile loading, the node bond failure and ribbon fracture are the main causes of the honeycomb core failure when the core is loaded along the transverse and ribbon directions, respectively. However, under compression loading, the ribbon fracture dominates the failure mode along both directions. The development of a failure envelope for a honeycomb core material is demonstrated using a combination of experiments and simulations. The failureenvelope is cast in terms of the core normal strains along the principal material directions. The failure envelope can be used as a design tool to determine the suitability of the core material for sandwich structural applications.

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Moghaddam, H. S., Keshavanarayana, S. R., Yang, C., & Horner, A. L. (2017). A numerical and experimental approach to characterize the failure modes of hexagonal cell honeycomb core under in-plane loading. Paper presented at the 32nd Technical Conference of the American Society for Composites 2017, 10, 2, 830-839.
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DEStech Publications Inc.
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