Natural frequencies and modal shapes of folded sandwich plates made of porous core and FG-CNTRC coating layers resting on two parameters elastic foundation

Publikationstyp
Journal Article
Date Issued
2024-05-01
Sprache
English
Author(s)
Salehipour, Hamzeh  
Ilam University, Ilam, Iran
Shahmohammadi, Mohammad Amin  
Konstruktion und Festigkeit von Schiffen M-10  
Civalek, Ömer  
Akdeniz University, Antalya, Turkiye
TORE-URI
https://hdl.handle.net/11420/47358
Journal
Aerospace science and technology  
Volume
148
Article Number
109077
Citation
Aerospace Science and Technology 148: 109077 (2024)
Publisher DOI
10.1016/j.ast.2024.109077
Scopus ID
2-s2.0-85189698975
Folded structures hold significant importance in aerospace technology due to their distinct design, effectively reconciling strength with a lightweight framework. Within aerospace applications, these structures fulfill diverse roles, serving as pivotal elements in aircraft wings, fuselage sections, and essential components of spacecraft and satellites. This study delves into the free vibration behavior of folded sandwich plates composed of a porous core and functionally graded carbon nanotube-reinforced composite (FG-CNTRC) coatings, resting on a two-parameter elastic foundation. Leveraging first-order shear deformation plate theory (FSDT), elasto-dynamic equations are established for each individual plate segment. Utilizing the two-dimensional generalized differential quadrature method (2D-GDQM), these equations are discretized. Subsequently, by applying boundary conditions to all six edges, including traditional clamped, simply supported, and free configurations, and incorporating continuity conditions for displacements, forces, and moments at the joint borders, natural frequencies and modal shapes are extracted for the folded plate structure. The validity of the proposed formulation and results is demonstrated by comparing them with numerical examples for both composite flat and folded plates. This comparison provides strong support for the accuracy and reliability of the present study. The study comprehensively examines the influence of various parameters on natural frequencies, including modal shape visualizations under different boundary configurations, plate thickness, crank angle, porosity parameter, core thickness, foundation stiffness, and CNTs distribution type.
Subjects
2D-GDQM
Elastic foundation
FG-CNTRC coating
Folded plate
Modal shapes
Natural frequencies
Porous core
DDC Class
620: Engineering
690: Building, Construction