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A Rate-Independent Constitutive Model for Square Honeycomb Core

[+] Author Affiliations
Zhenyu Xue

Harvard University

Paper No. IMECE2004-60326, pp. 373-379; 7 pages
doi:10.1115/IMECE2004-60326
From:
  • ASME 2004 International Mechanical Engineering Congress and Exposition
  • Aerospace
  • Anaheim, California, USA, November 13 – 19, 2004
  • Conference Sponsors: Aerospace Division
  • ISBN: 0-7918-4700-4 | eISBN: 0-7918-4178-2, 0-7918-4179-0, 0-7918-4180-4
  • Copyright © 2004 by ASME

abstract

All-metal sandwich construction with square honeycomb core holds promise for significant improvements in stiffness, strength and blast resistance for built-up plate structures. Analysis of the performance of sandwich plates under various loads, static and dynamic, requires modeling of face sheets and core with some fidelity. While it is possible to model full geometric details of the core for a few selected problems, this is unnecessary and unrealistic for larger complex structures under general loadings. A continuum constitutive model is recently developed as alternative means of modeling the cores. The constitutive model falls within the framework of a compressible rate-independent, anisotropic elastic-plastic solid. A multi-scale computing approach based on it has been developed for modeling the sandwich structures. The validity of the approach is established by comparing numerical finite element simulations using the model with those obtained by a full three-dimensional meshing of the core geometry for a clamped sandwich plate with square honeycomb core subject to uniform pressure load. Limitations of the model are also discussed.

Copyright © 2004 by ASME

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