Delamination from localized instabilities in compression sandwich panels

• Published in: Journal of the mechanics and physics of solids Vol. 49; no. 6; pp. 1281 - 1299
• Main Authors: Wadee, M.Ahmer, Blackmore, A.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.06.2001; Elsevier
• Subjects: A. Buckling; A. Delamination; Buckling; C. Stability and bifurcation; C. Variational calculus; Exact sciences and technology; Fundamental areas of phenomenology (including applications); Physics; Solid mechanics; Static buckling and instability; Structural and continuum mechanics; Structures; A. Delamination; A. Buckling; Structures; C. Stability and bifurcation; C. Variational calculus; Fold; Compression; Shell; Sandwich structure; Variational calculus; Delamination; Buckling; Modeling; Plate
• ISSN: 0022-5096
• DOI: 10.1016/S0022-5096(00)00078-8

Compressed sandwich structures, comprising two stiff face plates separated by a softer core material, while designed principally as efficient integral structures, can lose this quality when modes of overall (Euler) buckling and local buckling interact to produce buckle localization. Moreover, differing responses occur depending on the profile of the face plate buckling pattern relative to the core. An earlier variational formulation, leading to a system of nonlinear differential equations subject to boundary and integral constraints, has been adapted to account for an asymmetric response which manifests itself in delamination — the face plate coming apart from the core material. These are solved in a numerical continuation package, such that the response far into the unstable range can be portrayed.