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Fundamental frequency optimization of variable stiffness Multi-Region composite panels in Presence of geometrical nonlinearity

Touraj Farsadi, Majid Ahmadi, Shakir Jiffri Orcid Logo, Hamed Haddad Khodaparast Orcid Logo, Hasan Kurtaran, Michael Friswell, Sebastiano Fichera

Mechanical Systems and Signal Processing, Volume: 237, Start page: 112972

Swansea University Authors: Shakir Jiffri Orcid Logo, Hamed Haddad Khodaparast Orcid Logo, Michael Friswell

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DOI (Published version): 10.1016/j.ymssp.2025.112972

Abstract

Multi-region laminate optimization offers a comprehensive approach to enhance aerospace structures, making them efficient, safe, and cost-effective. Similarly, Automated Fiber Placement (AFP) processes optimize toolpaths and fiber deposition, reducing waste, saving time, and improving composite qual...

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Published in: Mechanical Systems and Signal Processing
ISSN: 0888-3270
Published: Elsevier BV 2025
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URI: https://cronfa.swan.ac.uk/Record/cronfa69743
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spelling 2025-06-16T11:55:38.4648164 v2 69743 2025-06-16 Fundamental frequency optimization of variable stiffness Multi-Region composite panels in Presence of geometrical nonlinearity 1d7a7d2a8f10ec98afed15a4b4b791c4 0000-0002-5570-5783 Shakir Jiffri Shakir Jiffri true false f207b17edda9c4c3ea074cbb7555efc1 0000-0002-3721-4980 Hamed Haddad Khodaparast Hamed Haddad Khodaparast true false 5894777b8f9c6e64bde3568d68078d40 Michael Friswell Michael Friswell true false 2025-06-16 ACEM Multi-region laminate optimization offers a comprehensive approach to enhance aerospace structures, making them efficient, safe, and cost-effective. Similarly, Automated Fiber Placement (AFP) processes optimize toolpaths and fiber deposition, reducing waste, saving time, and improving composite quality. Strategically placing fibers where needed, it boosts structural performance and allows for innovative composite designs. This study, first, focuses on optimizing the Fundamental Natural Frequency (FNF) of composite panels, which feature various Curvilinear Fiber Paths (CFP) mathematically modeled using bilinear interpolation distributed across different regions of the panel with comparisons drawn against the conventional Unidirectional (UD) fiber layup. Secondly, a study is conducted to explore the Fundamental Amplitude-dependent Nonlinear Frequencies (FANF) within the context of the optimized configuration featuring curved fiber layup. The modulation of stiffness in composite laminates is achieved through continuous adjustments of fiber angles, governed by the CFP function. A nonlinear structural model, grounded in the principles of virtual work, is employed for this analysis. The formulation incorporates Green’s nonlinear kinematic strain relations to accommodate geometric nonlinearities, and First-order Shear Deformation Theory (FSDT) is applied to extend the analysis to moderately thick cylindrical panels, including transverse shear deformations. The principal aim of this investigation is to evaluate the impact of Variable Stiffness (VS) parameters across multiple regions on the linear and nonlinear free vibration characteristics of the panel. This research examines symmetric eight-layered composite panel incorporating three distinct design regions and two boundary condition sets. The Generalized Differential Quadrature (GDQ) method is employed to solve the nonlinear equations of motion governing these structures. The numerical findings show the impact of fiber angle paths and boundary conditions on the FNF of cylindrical panels. Journal Article Mechanical Systems and Signal Processing 237 112972 Elsevier BV 0888-3270 Curvilinear Fiber Paths; Composite panels; Vibration; Optimisation; Geometrical Nonlinearity 15 8 2025 2025-08-15 10.1016/j.ymssp.2025.112972 COLLEGE NANME Aerospace, Civil, Electrical, and Mechanical Engineering COLLEGE CODE ACEM Swansea University SU Library paid the OA fee (TA Institutional Deal) This study has been supported by the Scientific and Technological Research Council of Türkiye (TÜBİTAK, Project No. 220 N396). 2025-06-16T11:55:38.4648164 2025-06-16T11:47:09.4313496 Faculty of Science and Engineering School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Aerospace Engineering Touraj Farsadi 1 Majid Ahmadi 2 Shakir Jiffri 0000-0002-5570-5783 3 Hamed Haddad Khodaparast 0000-0002-3721-4980 4 Hasan Kurtaran 5 Michael Friswell 6 Sebastiano Fichera 7 69743__34484__9a328037fe7b444dbfe5556db6250d18.pdf 69743.VoR.pdf 2025-06-16T11:52:03.8222426 Output 13730664 application/pdf Version of Record true © 2025 The Authors. This is an open access article under the CC BY license. true eng http://creativecommons.org/licenses/by/4.0/
title Fundamental frequency optimization of variable stiffness Multi-Region composite panels in Presence of geometrical nonlinearity
spellingShingle Fundamental frequency optimization of variable stiffness Multi-Region composite panels in Presence of geometrical nonlinearity
Shakir Jiffri
Hamed Haddad Khodaparast
Michael Friswell
title_short Fundamental frequency optimization of variable stiffness Multi-Region composite panels in Presence of geometrical nonlinearity
title_full Fundamental frequency optimization of variable stiffness Multi-Region composite panels in Presence of geometrical nonlinearity
title_fullStr Fundamental frequency optimization of variable stiffness Multi-Region composite panels in Presence of geometrical nonlinearity
title_full_unstemmed Fundamental frequency optimization of variable stiffness Multi-Region composite panels in Presence of geometrical nonlinearity
title_sort Fundamental frequency optimization of variable stiffness Multi-Region composite panels in Presence of geometrical nonlinearity
author_id_str_mv 1d7a7d2a8f10ec98afed15a4b4b791c4
f207b17edda9c4c3ea074cbb7555efc1
5894777b8f9c6e64bde3568d68078d40
author_id_fullname_str_mv 1d7a7d2a8f10ec98afed15a4b4b791c4_***_Shakir Jiffri
f207b17edda9c4c3ea074cbb7555efc1_***_Hamed Haddad Khodaparast
5894777b8f9c6e64bde3568d68078d40_***_Michael Friswell
author Shakir Jiffri
Hamed Haddad Khodaparast
Michael Friswell
author2 Touraj Farsadi
Majid Ahmadi
Shakir Jiffri
Hamed Haddad Khodaparast
Hasan Kurtaran
Michael Friswell
Sebastiano Fichera
format Journal article
container_title Mechanical Systems and Signal Processing
container_volume 237
container_start_page 112972
publishDate 2025
institution Swansea University
issn 0888-3270
doi_str_mv 10.1016/j.ymssp.2025.112972
publisher Elsevier BV
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Aerospace Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Aerospace Engineering
document_store_str 1
active_str 0
description Multi-region laminate optimization offers a comprehensive approach to enhance aerospace structures, making them efficient, safe, and cost-effective. Similarly, Automated Fiber Placement (AFP) processes optimize toolpaths and fiber deposition, reducing waste, saving time, and improving composite quality. Strategically placing fibers where needed, it boosts structural performance and allows for innovative composite designs. This study, first, focuses on optimizing the Fundamental Natural Frequency (FNF) of composite panels, which feature various Curvilinear Fiber Paths (CFP) mathematically modeled using bilinear interpolation distributed across different regions of the panel with comparisons drawn against the conventional Unidirectional (UD) fiber layup. Secondly, a study is conducted to explore the Fundamental Amplitude-dependent Nonlinear Frequencies (FANF) within the context of the optimized configuration featuring curved fiber layup. The modulation of stiffness in composite laminates is achieved through continuous adjustments of fiber angles, governed by the CFP function. A nonlinear structural model, grounded in the principles of virtual work, is employed for this analysis. The formulation incorporates Green’s nonlinear kinematic strain relations to accommodate geometric nonlinearities, and First-order Shear Deformation Theory (FSDT) is applied to extend the analysis to moderately thick cylindrical panels, including transverse shear deformations. The principal aim of this investigation is to evaluate the impact of Variable Stiffness (VS) parameters across multiple regions on the linear and nonlinear free vibration characteristics of the panel. This research examines symmetric eight-layered composite panel incorporating three distinct design regions and two boundary condition sets. The Generalized Differential Quadrature (GDQ) method is employed to solve the nonlinear equations of motion governing these structures. The numerical findings show the impact of fiber angle paths and boundary conditions on the FNF of cylindrical panels.
published_date 2025-08-15T05:27:44Z
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score 11.089572

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