Nonlinear aero-thermo-elastic characteristics analysis of porous FGM beams with general boundary conditions

ZHOU Kai,NI Zhen,HUA Hongxing

Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (20) : 34-41.

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PDF(1532 KB)
Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (20) : 34-41.

Nonlinear aero-thermo-elastic characteristics analysis of porous FGM beams with general boundary conditions

  • ZHOU Kai1,2,NI Zhen1,2,HUA Hongxing1,2
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Abstract

Aerospace flight vehicles are always subjected to severe environment including aerodynamic and thermal loads during the cruise and re-entry.Understanding of the aero-thermo-elastic characteristics of beam structures, which are served as the basic component of aerospace flight vehicles, is the basic to perform dynamic design and optimization of structures.The effects of thermal load and aerodynamic pressure were taken into consideration by using the thermo-elastic theory and the supersonic piston theory, respectively.The first-order shear deformation theory (FSDT) combined with von-Karman nonlinear strain-displacement relation was adopted to derive the governing equations of the system.The dynamic responses of the system were obtained by using the Newmark method combined with the Newton iteration method.By comparing the dynamic results obtained from the proposed model and those from the literature, the accuracy of the proposed method was validated.Finally, by performing the parametric analysis, the effects of the constraint, material constituent, thermal load and porosity ratio on the vibration and flutter characteristics of the beam structures were investigated.The results provide theoretical reference for the dynamic design and optimization of porous FGM beams.

Key words

functionally graded material beam / porosity / nonlinear vibration / aero-thermo-elastic / general boundary conditions

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ZHOU Kai,NI Zhen,HUA Hongxing. Nonlinear aero-thermo-elastic characteristics analysis of porous FGM beams with general boundary conditions[J]. Journal of Vibration and Shock, 2021, 40(20): 34-41

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