CUED Publications database

Collapse mechanism maps for the hollow pyramidal core of a sandwich panel under transverse shear

Pingle, SM and Fleck, NA and Deshpande, VS and Wadley, HNG (2011) Collapse mechanism maps for the hollow pyramidal core of a sandwich panel under transverse shear. International Journal of Solids and Structures, 48. pp. 3417-3430. ISSN 0020-7683

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Abstract

The finite element method has been used to develop collapse mechanism maps for the shear response of sandwich panels with a stainless steel core comprising hollow struts. The core topology comprises either vertical tubes or inclined tubes in a pyramidal arrangement. The dependence of the elastic and plastic buckling modes upon core geometry is determined, and optimal geometric designs are obtained as a function of core density. For the hollow pyramidal core, strength depends primarily upon the relative density ρ̄ of the core with a weak dependence upon tube slenderness. At ρ̄ below about 3%, the tubes of the pyramidal core buckle plastically and the peak shear strength scales linearly with ρ̄. In contrast, at ρ̄ above 3%, the tubes do not buckle and a stable shear response is observed. The predictions of the current study are in excellent agreement with previous measurements on the shear strength of the hollow pyramidal core, and suggest that this core topology is attractive from the perspectives of both core strength and energy absorption. © 2011 Elsevier Ltd. All rights reserved.

Item Type: Article
Uncontrolled Keywords: Brazier buckling Finite element analysis Hollow pyramidal core Lattice materials Plastic buckling
Subjects: UNSPECIFIED
Divisions: Div C > Materials Engineering
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 11:25
Last Modified: 27 Nov 2014 19:19
DOI: 10.1016/j.ijsolstr.2011.08.004