Vol. 1, No. 3, 2006

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ISSN: 1559-3959
Quasi-static punch indentation of a honeycomb sandwich plate: experiments and modelling

Dirk Mohr, Zhenyu Xue and Ashkan Vaziri

Vol. 1 (2006), No. 3, 581–604
Abstract

Punching experiments on wide honeycomb sandwich beams were performed to evaluate the predictive capabilities of a newly developed constitutive model in structural applications. The employed constitutive model for plastically compressible orthotropic materials accounts for both non-uniform hardening and softening associated with stressing in different directions. This feature is vital when assessing the structural performance of metal sandwich plates with low density cellular cores. Pure shear and uniaxial compression tests have been carried out to identify the input stress-strain data for the constitutive model. The sandwich beam has been modeled with shell/beam elements for the face sheets and only one continuum element through-the-thickness for the honeycomb core material. Comparison of the numerical results with experimental observations validates the capability of the proposed approach based on continuum modeling of the core in capturing the main features of sandwich beam response under punch loading.

Keywords
sandwich structures, finite element modeling, constitutive modeling, metallic honeycomb, plasticity
Milestones
Received: 16 December 2005
Revised: 19 January 2006
Accepted: 26 January 2006
Published: 1 July 2006
Authors
Dirk Mohr
Impact and Crashworthiness Laboratory
Massachusetts Institute of Technology
Cambridge, MA
United States
http://web.mit.edu/mohr/www
Zhenyu Xue
Division of Engineering and Applied Sciences
Harvard University
Cambridge, MA
United States
Ashkan Vaziri
Division of Engineering and Applied Sciences
Harvard University
Cambridge, MA
United States
http://www.deas.harvard.edu/~avaziri