Response of flexible structures to air-blast: nonlinear compressibility effects in fluid–structure interaction

IF 2.9 3区 综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES
Aninda Pal, Ritwik Ghoshal
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Abstract

This paper presents a coupled model that considers the nonlinear compressibility effect in fluid–structure interaction (FSI) during air-blast loading on flexible structures. In this coupled model, structural behaviour is idealized as a linear single-degree-of-freedom mass-spring-damper system whereas nonlinear fluid compressibility is considered by applying Rankine–Hugoniot jump conditions across a moving plate. The surrounding fluid medium is modelled with an ideal gas equation and hence, this model can be applied for FSI analysis with relatively strong shocks (reflection coefficient of up to 8). The nonlinear compressibility of the fluid medium at the backside of the plate is also considered in this coupled formulation and its effects on the structural responses are examined. Moreover, the negative/underpressure phase of the reflected wave profile, which is typically neglected in a decoupled model, is also considered in the proposed model and its influence on the structural response is also investigated. The study reveals that the nonlinear compressibility of fluid medium significantly influences the coupled FSI phenomena, especially in flexible lightweight structures. Numerical examples are presented to highlight the implications of the nonlinear compressibility effect in FSI on the reflected pressure profile and the response of flexible structures. Parametric dependencies of response on structural mass and natural frequency are examined thoroughly and a response spectrum is obtained. It is envisaged that the lightweight protective structure design under higher blast intensity may benefit from this study.

柔性结构对空气冲击波的响应:流体与结构相互作用中的非线性可压缩性效应
本文提出了一种耦合模型,该模型考虑了柔性结构在气爆加载过程中流体与结构相互作用(FSI)中的非线性可压缩性效应。在该耦合模型中,结构行为被理想化为线性单自由度质量-弹簧-阻尼系统,而非线性流体可压缩性则通过在移动板上应用朗肯-胡戈尼奥特跃迁条件来考虑。周围流体介质采用理想气体方程建模,因此,该模型可应用于具有相对较强冲击力(反射系数高达 8)的 FSI 分析。该耦合模型还考虑了板背面流体介质的非线性可压缩性,并研究了其对结构响应的影响。此外,反射波剖面的负压/欠压相位通常在解耦模型中被忽略,在所提出的模型中也考虑了这一相位,并研究了其对结构响应的影响。研究表明,流体介质的非线性可压缩性对 FSI 耦合现象有显著影响,尤其是在柔性轻质结构中。研究还给出了数值示例,以强调 FSI 中的非线性可压缩性效应对反射压力曲线和柔性结构响应的影响。深入研究了响应对结构质量和固有频率的参数依赖关系,并获得了响应谱。预计在更高爆炸强度下的轻型防护结构设计可能会受益于这项研究。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
6.40
自引率
5.70%
发文量
227
审稿时长
3.0 months
期刊介绍: Proceedings A has an illustrious history of publishing pioneering and influential research articles across the entire range of the physical and mathematical sciences. These have included Maxwell"s electromagnetic theory, the Braggs" first account of X-ray crystallography, Dirac"s relativistic theory of the electron, and Watson and Crick"s detailed description of the structure of DNA.
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