Nonlinear flutter of composite laminates with curvilinear fibres using a full linearized aerodynamic theory

• Type: Article in International Scientific Journal
• Date: 2022-10-13

Authors

Hamed Akhavan (Author) FEUP; Pedro Ribeiro (Author) FEUP

Journal

Title: Journal of Fluids and Structures

Vol. 115

ISSN: 0889-9746

Publisher: Elsevier

Indexing

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ScienceDirect (Elsevier)

Other information

Authenticus ID: P-00X-BP8

DOI: 10.1016/j.jfluidstructs.2022.103756

Abstract (EN): This paper studies nonlinear flutter of rectangular variable stiffness composite laminates (VSCLs) subjected to a low supersonic airflow. The VSCLs are formed by different individual laminae where a polymeric matrix is reinforced by curvilinear carbon fibres. The plate's displacement field follows a Third-order Shear Deformation Theory (TSDT); a p-version finite element is employed to discretize the displacement components. A full linearized (inviscid, potential flow) aerodynamic theory is used to approximate the aerodynamic pressure. The self-exciting vibrational model is formed using the principle of virtual work. The equations of motion representing the model are solved using Newmark method. Limit cycle oscillations (LCOs) of these plates are studied using time histories, phase-plane plots and FFT spectra. A damage onset criterion is utilized to control the structural health of the laminates during nonlinear flutter. Effects of curvilinear fibre path angles on linear and nonlinear flutter behaviour, as well as the damage onset in VSCLs are investigated.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 17