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A coupled closed-form/Doubly Asymptotic Approximation approach for the response of orthotropic plates subjected to an underwater explosion

Abstract : In this paper, a closed-form analytical solution procedure is proposed to solve the coupled fluid-structure interaction (FSI) equations that involve the first-order Doubly Asymptotic Approximation (DAA1) formulation. An efficient method comprised of the nonstandard finite difference (NSFD) scheme is applied. First of all, analytical equations are developed to analyze the response of a rigid mass-spring oscillator in an air-backed condition when it is subjected to a plane shock exponential wave coming from a far-field underwater explosion. After validating the results with LS-DYNA/USA (DAA1), these equations are extended to determine the response of a two-dimensional, simply-supported rectangular plate, and then tested on the isotropic and orthotropic plates within a small deflection regime. Parametric studies are also performed by varying the load decay times, peak pressures, as well as the aspect ratios of the plate. Finally, the advantages and limitations of the proposed formulae are exposed along with suggestions for the future work.
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https://hal.archives-ouvertes.fr/hal-03329063
Contributor : Olivier Dorival Connect in order to contact the contributor
Submitted on : Wednesday, September 29, 2021 - 10:00:16 AM
Last modification on : Tuesday, October 19, 2021 - 11:17:38 PM

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Ye Pyae Sone Oo, Hervé Le Sourne, Olivier Dorival. A coupled closed-form/Doubly Asymptotic Approximation approach for the response of orthotropic plates subjected to an underwater explosion. Ships and Offshore Structures, Taylor & Francis, 2021, 16 (sup1), pp.171-185. ⟨10.1080/17445302.2021.1918962⟩. ⟨hal-03329063⟩

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