A coupled closed-form/Doubly Asymptotic Approximation approach for the response of orthotropic plates subjected to an underwater explosion. (18th August 2021)

• Record Type: Journal Article
• Authors: Sone Oo, Ye Pyae; Le Sourne, Hervé; Dorival, Olivier
• Is Part Of: Ships and offshore structures. Volume 16(2021)Supplement 1
• Page Start: 171
• Page End: 185
• Publication Date: 2021-08-18
• Subjects: Doubly Asymptotic Approximation (DAA) -- fluid-structure interaction (FSI) -- Underwater explosion (UNDEX) -- LS-DYNA/USA -- nonstandard finite difference (NSFD) method; Ships -- Periodicals; Offshore structures -- Periodicals; Marine engineering -- Periodicals; Marine engineering -- Technological innovations -- Periodicals; Ocean engineering -- Periodicals; Ocean engineering -- Technological innovations -- Periodicals; 623.8
• DOI: 10.1080/17445302.2021.1918962
• Languages: English
• ISSNs: 1744-5302

Abstract

ABSTRACT: 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.