Vol. 2, No. 10, 2007

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ISSN: 1559-3959
Deformation and fracture modes of sandwich structures subjected to underwater impulsive loads

L. F. Mori, S. Lee, Z. Y. Xue, A. Vaziri, D. T. Queheillalt, K. P. Dharmasena, H. N. G. Wadley, J. W. Hutchinson and H. D. Espinosa

Vol. 2 (2007), No. 10, 1981–2006
Abstract

Sandwich panel structures with thin front faces and low relative density cores offer significant impulse mitigation possibilities provided panel fracture is avoided. Here steel square honeycomb and pyramidal truss core sandwich panels with core relative densities of 4% were made from a ductile stainless steel and tested under impulsive loads simulating underwater blasts. Fluid-structure interaction experiments were performed to (i) demonstrate the benefits of sandwich structures with respect to solid plates of equal weight per unit area, (ii) identify failure modes of such structures, and (iii) assess the accuracy of finite element models for simulating the dynamic structural response. Both sandwich structures showed a 30% reduction in the maximum panel deflection compared with a monolithic plate of identical mass per unit area. The failure modes consisted of core crushing, core node imprinting/punch through/tearing and stretching of the front face sheet for the pyramidal truss core panels. Finite element analyses, based on an orthotropic homogenized constitutive model, predict the overall structural response and in particular the maximum panel displacement.

Keywords
fluid-structure interaction, sandwich structures, dynamic plasticity
Milestones
Received: 5 August 2007
Accepted: 6 August 2007
Published: 1 December 2007
Authors
L. F. Mori
Department of Mechanical Engineering
Northwestern University
Evanston, IL 60208
United States
S. Lee
Department of Mechanical Engineering
Northwestern University
Evanston, IL 60208
United States
Z. Y. Xue
School of Engineering and Applied Sciences
Harvard University
Cambridge, MA 02138
United States
A. Vaziri
School of Engineering and Applied Sciences
Harvard University
Cambridge, MA 02138
United States
D. T. Queheillalt
Department of Materials Science and Engineering
University of Virginia
140 Chemistry Way
Charlottesville, VA 22904
United States
K. P. Dharmasena
Department of Materials Science and Engineering
University of Virginia
140 Chemistry Way
Charlottesville, VA 22904
United States
H. N. G. Wadley
Department of Materials Science and Engineering
University of Virginia
140 Chemistry Way
Charlottesville, VA 22904
United States
J. W. Hutchinson
School of Engineering and Applied Sciences
Harvard University
Cambridge, MA 02138
United States
H. D. Espinosa
Department of Mechanical Engineering
Northwestern University
Evanston, IL 60208
United States