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Article

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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References

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.
Gough,  G. S., Elam,  C. F., and de Bruyne,  N. A., 1940, “The Stabilization of a Thin Sheet by a Continuous Supporting Medium,” J. R. Aeronaut. Soc., 44, pp. 12–43.
Hoff,  N. J., and Mautner,  S. E., 1945, “The Buckling of Sandwich-Type Panels,” J. Aeronaut. Sci., 12, pp. 285–297, eq. (103).
Grenestedt, J. L., and Olsson, K.-A., 1995, “Wrinkling of Sandwich with Layered Core or Non-Symmetric Skins,” Proc. Third International Conference on Sandwich Construction, Southampton, UK, 12–15 September.
Shield,  T. W., Kim,  K. S., and Shield,  R. T., 1994, “The Buckling of an Elastic Layer Bonded to an Elastic Substrate in Plane Strain,” ASME J. Appl. Mech., 61, pp. 231–235.Corrections: ASME J. Appl. Mech., 61 , pp. 796, and further, 1994, b=ω[1−P(1−2ν)/(2μ(1−ν))]1/2 in Eq. (4).
Hill,  R., 1957, “On Uniqueness and Stability in the Theory of Finite Elastic Strains,” J. Mech. Phys. Solids, 5, pp. 229–241.
Hill,  R., 1967, “Eigenmodal Deformations in Elastic/Plastic Continua,” J. Mech. Phys. Solids, 15, pp. 371–386.
Hutchinson, J. W., 1974, “Plastic Buckling,” in Advances in Applied Mechanics, C.-S. Yih, ed., 14 , pp. 67–144.
DIAB. Divinycell H-Grade Technical Manual, 10.00. DIAB AB, Box 201, S-312 22 Laholm, Sweden (also available at www.diabgroup.com/DIAB/filecabinet.nsf/LookupFiles/H_Man_M/$file/H_Man_M.pdf)
Ley, R. P., Lin, W., and Mbanefo, U., 1999, “Facesheet Wrinkling in Sandwich Structures,” NASA/CR-1999-208994.

Figures

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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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