Abstract
The thermal buckle and flutter behaviors of the asymmetrically curved-fiber composite panel in supersonic air flow are studied in frequency and time domains. Based on the Mindlin thick plate theory, the Von Karman large-deformation assumption and the quasi-steady supersonic piston theory were adopted to describe deformations and supersonic loads of the composite panel, respectively. According to Hamilton variational principle, the nonlinear aerothermoelastic equations of the asymmetrically curvilinear-fiber panel were established with frequency domain characteristics obtained by the complex mode method and time domain responses obtained by the Newmark method, respectively. After verifying the correctness of the current method, the influences of temperature gradient, curvilinear-fiber orientation and incoming airflow pressure on the static large-deflection, mode coalescence, flutter-buckling boundary, time-history responses and phase-plane plots of the composite panel were discussed in detail.
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Abbreviations
- T 0 :
-
Tangential angles of the beginning of the curved fiber
- T 1 :
-
Tangential angles of the end of the curved fiber
- θ k :
-
Azimuth of the curved fiber at each point
- u, v, w :
-
Displacement components
- ε 0m :
-
In-plane strain vector
- ε 0b :
-
Nonlinear membrane stretching strain vector
- κ :
-
Bending curvature vector
- \(\overline {\boldsymbol{Q}} \left( x \right)\) :
-
Transformed material matrix
- \({\overline {\boldsymbol{Q}} _s}\left( x \right)\) :
-
Shear material matrix
- ∆T :
-
Temperature rise
- T u :
-
Average temperature rise
- T g :
-
Temperature gradient
- N :
-
Membrane force
- M :
-
Membrane moment
- F s :
-
Ttransverse shear force
- Δp :
-
Aerodynamic load
- δU M :
-
Virtual strain energy
- δU T :
-
Temperature strain energy generated
- δT :
-
Virtual kinetic energy
- δW :
-
Virtual work of the aerodynamic force and damping force
- M :
-
Mass matrix and aerodynamic damping matrix
- K 0 :
-
Linear stiffness matrix
- K ∆T :
-
Temperature stiffness matrix
- K N1, K N2 :
-
Nonlinear stiffness matrices
- K A0 :
-
Linear aerodynamic stiffness matrix
- C A0 :
-
Linear aerodynamic damping matrix
- u s :
-
Static deformation
- u d :
-
Dynamic deformation
- \({\boldsymbol{\ddot q}},\,\,{\boldsymbol{\dot q}},\,\,{\boldsymbol{q}}\) :
-
Displacement, velocity, acceleration in modal coordinates
- λ :
-
Dimensionless dynamic pressure
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Acknowledgments
This work was supported by the Open Fund for Key Laboratory of Airworthiness Certification Technology of Civil Aviation Aircraft (Grant No. SH2020112705), China, the Natural Science Foundation of China (Grant No.11702325), China and the Key Research and Development Projects in Hebei Province (Grant No.21350401D), China.
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Jingbo Duan is an Associate Professor of the Department of Engineering Mechanics, Shijiazhuang Tiedao University. He received his Ph.D. in Solid Mechanics from National University of Defence Technology. His research interests include aeroelastic flutter stability of composite panels and numerical calculation method in mechanics and engineering.
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Liu, Y., Duan, J., Gao, Y. et al. Nonlinear supersonic aerothermoelastic analysis of as ymmetrically curved-fiber composite panels with nonuniform temperature distributions. J Mech Sci Technol 37, 1325–1337 (2023). https://doi.org/10.1007/s12206-023-0219-x
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DOI: https://doi.org/10.1007/s12206-023-0219-x