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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 |
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Vol. 2 (2007), No. 10, 1981–2006
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Abstract |
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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
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Milestones
Received: 5 August 2007
Accepted: 6 August 2007
Published: 1 December 2007
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Authors |
| L. F. Mori | |
| Department of Mechanical
Engineering Northwestern University Evanston, IL 60208 United States |
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| S. Lee | |
| Department of Mechanical
Engineering Northwestern University Evanston, IL 60208 United States |
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| Z. Y. Xue | |
| School of Engineering and Applied
Sciences Harvard University Cambridge, MA 02138 United States |
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| A. Vaziri | |
| School of Engineering and Applied
Sciences Harvard University Cambridge, MA 02138 United States |
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| D. T. Queheillalt | |
| Department of Materials Science and
Engineering University of Virginia 140 Chemistry Way Charlottesville, VA 22904 United States |
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| K. P. Dharmasena | |
| Department of Materials Science and
Engineering University of Virginia 140 Chemistry Way Charlottesville, VA 22904 United States |
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| H. N. G. Wadley | |
| Department of Materials Science and
Engineering University of Virginia 140 Chemistry Way Charlottesville, VA 22904 United States |
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| J. W. Hutchinson | |
| School of Engineering and Applied
Sciences Harvard University Cambridge, MA 02138 United States |
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| H. D. Espinosa | |
| Department of Mechanical
Engineering Northwestern University Evanston, IL 60208 United States |
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