Analysis and Optimization of Composite Kagome Grid Panels Subjected to the Low Velocity Impact
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RESEARCH PAPER
Analysis and Optimization of Composite Kagome Grid Panels Subjected to the Low Velocity Impact A. Semmani1 · Z. Sereir1 · Y. Hamou2 Received: 22 October 2019 / Accepted: 26 March 2020 © Society for Experimental Mechanics, Inc 2020
Abstract By the present paper, an optimal volume technique of stiffened laminated panel subjected to Low Velocity Impact (LVI) is developed using an analytical model that couples a genetic algorithm optimization technique. Using the first-order transverse-shear deformation theory (FSDT) for anisotropic plates, the stiffness of the Kagome grid stiffeners and the plate are estimated by considering both effects of moments and forces in a basic repetitive cell. Where, the stiffness of the equivalent plate is computed by superposing stiffness the plate and Kagome stiffeners. The contact impactor/panel is idealized by the mass/spring model. The convergence of the impact force and the transverse displacement response at the contact point are plotted. Using the genetic algorithm (GA), the minimization of the panel volume is achieved in two stages. In the first stage, the design variables are the mechanical properties of the equivalent plate and the impactor. But, in the second stage, the stacking sequences were considered as design variables. Finally a parametric study is made and major conclusions are deduced regarding to the panel volume, time and impact velocity on behavior of the stiffened panel. The results show that the increase in stiffeners thickness is traduced by smaller transverse displacement involving a better impact performance, best optimization and panel integrity. Keywords Kagome grid panel · Impact force · Analytical model · Equivalent stiffness · Genetic algorithm
Introduction Stiffened panels are specific structural elements usually used in mechanical aerospace, automobile and ship construction. These panels are intensively used in many industrial fields. Laminated composite stiffened panels interested some industrial applications like, ship hulls, offshore, bridge decks and aircraft fuselage reinforcement. The use of laminated composite panel offers flexibility to adapt different properties of structures to reach strength and stiffness requirements [1–4]. But in many cases, these structures are likely to meet impact * Z. Sereir zouaoui.sereir@univ‑usto.dz A. Semmani amar.semmani@univ‑usto.dz 1
Université des Sciences et de la Technologie d’Oran Mohamed Boudiaf, LSCMI Laboratory, Faculté de Génie Mécanique, BP 1505 el M’naouer, USTO, Oran, Algeria
Université des Sciences et de la Technologie d’Oran Mohamed Boudiaf, Faculté de Génie Mécanique, BP 1505 el M’naouer, USTO, Oran, Algeria
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or collapse. Despite their several advantages, these structures exhibit very complex impact behavior and are sensitive to microscopic damage which influences their residual load bearing capacity [5]. Therefore, the service life is reduced. For this, most researchers tried to increase the structural strength against impact load by designing and selecting suitable mater
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