Elastic-Plastic Wrinkling of Sandwich Panels With Layered Cores

[+] Author and Article Information
Joachim L. Grenestedt

Department of Mechanical Engineering and Mechanics, Lehigh University, 19 Memorial Drive West, Bethlehem, PA 18015e-mail jog5@lehigh.edu

Mikael Danielsson

Albany International AB, Box 510, SE 301 80 Halmstad, Swedene-mail: mikael.danielsson@albint.com

J. Appl. Mech 72(2), 276-281 (Mar 15, 2005) (6 pages) doi:10.1115/1.1828063 History: Received February 23, 2004; Revised August 11, 2004; Online March 15, 2005
Copyright © 2005 by ASME
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Danielsson,  M., and Grenestedt,  J. L., 1998, “Gradient Foam Core Materials for Sandwich Structures, Preparation and Characterisation,” Composites, Part A, 29(8), pp. 981–988.
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Specimen under consideration, consisting of two aluminum skins (material #1, dark gray), attached to two layers of high density foam (material #2, light gray), sandwiching a low density foam (material #3, white)
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Stress-strain relation of the aluminum skins according to the Ramberg-Osgood relation and the parameters in Table 1. The “yield” strain ε=0.62% is also plotted.
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Geometry of the analytically analyzed structure
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Comparison between experimental and theoretical wrinkling stress for a sandwich with a layered core. Elastic analysis (dotted line), elastic-plastic analysis (solid line), and experiments (X). The experimental configuration with h2/h1=∞ is plotted near the right end of the graph and marked with an arrow.
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Normalized load carrying capability σwrskinh1B/(Eskinh1A) of a sandwich with given mass and thickness, as a function of normalized thickness h2B/h1B of a layer of high density core




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