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Transient Dynamic Response and Failure of Sandwich Composite Structures under Impact Loading with Fluid Structure Interaction

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Abstract

The objective of this study is to examine the Fluid Structure Interaction (FSI) effect on transient dynamic response and failure of sandwich composite structures under impact loading. The primary sandwich composite used in this study consisted of a 6.35 mm balsa core and a multi-ply symmetrical plain weave 6 oz E-glass skin. Both clamped sandwich composite plates and beams were studied using a uniquely designed vertical drop-weight testing machine. There were three impact conditions on which these experiments focused. The first of these conditions was completely dry (or air surrounded) testing. The second condition was completely water submerged. The final condition was also a water submerged test with air support at the backside of the plates. The tests were conducted sequentially, progressing from a low to high drop height to determine the onset and spread of damage to the sandwich composite when impacted with the test machine. The study showed the FSI effect on sandwich composite structures is very critical such that impact force, strain response, and damage size are generally much greater with FSI under the same impact condition. As a result, damage initiates at much lower impact energy conditions with the effect of FSI. Neglecting to account for FSI effects on sandwich composite structures results in very non-conservative analysis and design. Additionally, it was observed that the damage location changed for sandwich composite beams with the effect of FSI.

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Authors and Affiliations

  1. Department of Mechanical & Aerospace Engineering, Naval Postgraduate School, Monterey, CA, 93943, USA

    Y. W. Kwon, M. A. Violette, R. D. McCrillis & J. M. Didoszak

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  1. Y. W. Kwon
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  2. M. A. Violette
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  3. R. D. McCrillis
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  4. J. M. Didoszak
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Correspondence to Y. W. Kwon.

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Kwon, Y.W., Violette, M.A., McCrillis, R.D. et al. Transient Dynamic Response and Failure of Sandwich Composite Structures under Impact Loading with Fluid Structure Interaction. Appl Compos Mater 19, 921–940 (2012). https://doi.org/10.1007/s10443-012-9249-8

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  • DOI: https://doi.org/10.1007/s10443-012-9249-8

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