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Research Papers: Fluid-Structure Interaction

Impact to Composite Box Containing Water and Baffles

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

Department of Mechanical and
Aerospace Engineering,
Naval Postgraduate School,
Monterey, CA 93943
e-mail: ywkwon@nps.edu

T. J. South

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

K. J. Yun

Agency for Defense Development,
Daejeon 305-600, South Korea

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received June 29, 2016; final manuscript received August 25, 2016; published online October 11, 2016. Assoc. Editor: Jong Chull Jo.This material is declared a work of the U.S. Government and is not subject to copyright protection in the United States. Approved for public release; distribution is unlimited.

J. Pressure Vessel Technol 139(3), 031304 (Oct 11, 2016) (9 pages) Paper No: PVT-16-1100; doi: 10.1115/1.4034587 History: Received June 29, 2016; Revised August 25, 2016

A series of experimental tests were conducted for low-velocity impact on a composite box containing water in order to study the fluid–structure interaction (FSI). Then, baffles were inserted in the box to examine their effect on the structural response of the composite box. Finally, a computational study was conducted to supplement the experimental study. The water level inside the composite box was varied incrementally from 0% (i.e., no water) to 100% (full water). The impact velocity was also changed. In the experimental study, strain gauges and the load cell were used to measure the strain responses at the front, side, and back surfaces as well as the impact force. The results showed that the FSI effect was significant to the structural responses depending on the water level. The effect of the baffle was different among the front, side, and back surfaces. Both experimental and numerical results agreed well.

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References

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Figures

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Fig. 1

Experimental setup

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Fig. 2

Stain gauge locations: (a) front surface and (b) side and back surfaces

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Fig. 3

Two baffles: (a) cross-shape baffle called baffle 1 and (b) box-shape baffle called baffle 2

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Fig. 4

Finite mesh for the (a) box and the (b) fluid

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Fig. 17

Comparison of strains at the side surface between the numerical and experimental results

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Fig. 18

Comparison of transverse displacement at the back surface of the box without water and with 100% full water

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Fig. 19

Comparison of contour plots of the front surface deformation (a) without water and (b) with 100% water (a half model because of symmetry)

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Fig. 16

Comparison of impact forces at the front face between the numerical and experimental results without water

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Fig. 15

Plot of the lowest frequency of the back surface as a function of water fill level for different initial impact velocities with and without baffles

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Fig. 7

Plot of horizontal strain-time history at the front surface

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Fig. 6

Plot of maximum impact force for different water fill levels

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Fig. 5

Plot of impact force versus time: (a) zoom-in view and (b) zoom-out view

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Fig. 20

Comparison of contour plots of the side surface deformation (a) without water and (b) with 100% water

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Fig. 21

Comparison of contour plots of the back surface deformation (a) without water and (b) with 100% water

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Fig. 22

Comparison of strains at the front surface of the empty box with two different boundary conditions (1/2 sym. means bottom constrained, 1/4 sym. means both top and bottom constrained)

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Fig. 23

Comparison of strains at the front surface of the 100% water-full box with two different boundary conditions (1/2 sym. means bottom constrained, 1/4 sym. means both top and bottom constrained)

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Fig. 24

Comparison of strains at the back surface of the 100% water-full box with two different boundary conditions

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Fig. 14

Plot of the lowest frequency as a function of water fill level

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Fig. 13

Plot of frequency spectrum for 50% full cases corresponding to the two test cases plotted in Fig. 12

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Fig. 12

Comparison of strain histories for 50% full cases with the same impact condition

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Fig. 11

Plot of time for the maximum strain at the back face versus water fill level

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Fig. 10

Plot of the maximum strain at the back surface versus water fill level

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Fig. 9

Plot of the maximum strain at the front surface versus water fill level

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Fig. 8

Plot of strain-time history at the front surface with near full water levels

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