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Research Papers

Fluid Structure Interactions for Blast Wave Mitigation

[+] Author and Article Information
Wen Peng, George Gogos

Department of Mechanical Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588

Zhaoyan Zhang

Department of Mechanical Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588zzhang5@unl.edu

George Gazonas

 U.S. Army Research Laboratory, Aberdeen Proving Ground, MD 21005

J. Appl. Mech 78(3), 031016 (Feb 16, 2011) (8 pages) doi:10.1115/1.4002758 History: Received February 11, 2010; Revised September 24, 2010; Posted October 12, 2010; Published February 16, 2011; Online February 16, 2011

The dynamic response of a free-standing plate subjected to a blast wave is studied numerically to investigate the effects of fluid-structure interaction (FSI) in blast wave mitigation. Previous work on the FSI between a blast wave and a free-standing plate (Kambouchev, N., , 2006, “Nonlinear Compressibility Effects in Fluid-Structure Interaction and Their Implications on the Air-Blast Loading of Structures,” J. Appl. Phys., 100(6), p. 063519) has assumed a constant atmospheric pressure at the back of the plate and neglected the resistance caused by the shock wave formation due to the receding motion of the plate. This paper develops an FSI model that includes the resistance caused by the shock wave formation at the back of the plate. The numerical results show that the resistance to the plate motion is especially pronounced for a light plate, and as a result, the previous work overpredicts the mitigation effects of FSI. Therefore, the effects of the interaction between the plate and the shock wave formation at the back of the plate should be considered in blast wave mitigation.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of a free-standing plate subjected to a blast wave

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Figure 2

The ratio of impulse versus compressible FSI parameter for different blast intensities

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Figure 3

Numerical and analytical pressure profiles of the induced shock wave behind the plate for (a) low and (b) high plate velocities at different times

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Figure 4

The ratio of impulse versus FSI parameter for acoustic wave

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Figure 5

The reflection coefficient pr/pu as a function of time t

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Figure 6

The reflection coefficient for different plate thicknesses at different uniform incident blast intensities. (a) Uniform incident blast intensities of 0–50; (b) uniform incident blast intensities of 0–500.

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Figure 7

Comparison between the ratio of impulse Ip/Ii with and without resistance for low blast intensity at different plate thicknesses

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Figure 8

Comparison between the ratio of impulse Ip/Ii with and without resistance for higher blast intensity at different plate thicknesses

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Figure 9

Comparison between the ratio of impulse Ip/Ii with and without resistance for typical blast wave at different plate thicknesses

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Figure 10

The ratio of impulse Ip/Ii as a function of incident impulse Ii

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