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Research Papers: Fluid-Structure Interaction

Study of Fluid Effects on Dynamics of Composite Structures

[+] Author and Article Information
Y. W. Kwon

Department of Mechanical and Aerospace Engineering, Naval Postgraduate School, Monterey, CA 93943

J. Pressure Vessel Technol 133(3), 031301 (Mar 29, 2011) (6 pages) doi:10.1115/1.4002377 History: Received March 19, 2009; Revised August 11, 2010; Published March 29, 2011; Online March 29, 2011

This study investigated the effect of fluid-structure interaction on dynamic responses of submerged composite structures subjected to a mechanical impact loading. The research was focused on finding various parameters that affected the transient dynamic responses of the submerged composite structures. To this end, coupled fluid-structure interaction analyses of composite structures surrounded by a water medium were conducted numerically for various parametric studies and their results were compared with those of dry (i.e., in air) structures in order to understand the role of each parameter under study. Furthermore, modified dry structural models were developed to represent the dynamic responses of the same structures under water with a reasonable accuracy. Those models would be beneficial to predict the structural behaviors under water without an expensive computational or experimental cost.

Copyright © 2011 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Comparison of stresses in the middle of a 3D composite axial bar with free vibration between being in air and being in water: (a) early time response and (b) later time response

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Figure 2

Comparison of stresses in the middle of a 3D steel axial bar with free vibration between being in air and being in water

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Figure 3

Comparison of normalized displacements of the right end of the 1D axial member whose left end was fixed while the right end was under a constant compressive loading and attached to an infinite pseudofluid medium; the density and modulus of pseudofluid medium were varied to determine their effects on the structural member vibration

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Figure 4

Comparison of bending stresses at the center of a square E-glass composite plate under a constant center force while the plate was in air or under water

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Figure 5

Comparison of bending stresses at the center of a square E-glass composite plate under a constant center force while the plate was in air or under water as the density of the plate increased four times as a parametric study

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Figure 6

Comparison of bending stresses at the center of a square E-glass composite plate under a constant center force while the plate was in air or under water as the inplane elastic modulus of the plate increased four times as a parametric study

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Figure 7

Comparison of bending stresses at the center of the bottom surface of a thinner composite plate (L/t=40) in air (dry) and under water (wet) conditions

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Figure 8

Modified dry axial member model that substitutes the axial member submerged under water with FSI

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Figure 9

Comparison of tip displacements of 1D axial members between the modified dry member with added mass and damper (modified dry model) and the same axial member in contact with pseudofluid (wet model)

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Figure 10

Comparison of total energy variations of axial members between 3D wet model and modified 1D model with added mass and damper; the axial member had a cross-sectional area of 0.2×0.2 m2

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Figure 11

Comparison of total energy variations of axial members between 3D wet model and modified 1D model with added mass and damper; the axial member had a cross-sectional area of 0.1×0.1 m2

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Figure 12

Comparison of total energy variations of axial members between 3D wet model and modified 1D model with added mass and damper; the axial member had a cross-sectional area of 0.1×0.1 m2, and its density was also reduced by a half

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Figure 13

Modified dry beam model that represents the beam structure submerged under water with FSI

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Figure 14

Comparison of total energy variations of beam members between 3D wet model and modified 1D model with added mass and damper

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Figure 15

Comparison of bending stresses at the center point of the bottom surface of a composite plate in air (dry), under water (wet), and in air with added mass

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Figure 16

Comparison of bending stresses at the quarter point along the diagonal line of the bottom surface of a composite plate in air (dry), under water (wet), and in air with added mass

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