Thermal post-buckling and the stability boundaries of structurally damped functionally graded panels in supersonic airflows

摘要

In this study, the thermal post-buckling behaviors and linear flutter analysis of structurally damped functionally graded (FG) panels under a supersonic airflow are investigated. The material properties are assumed to be temperature-dependent and vary in the thickness direction of the panel. First-order shear-deformation theory (FSDT) is applied to model the panel, and the von Karman strain-displacement relations are adopted to consider the geometric nonlinearity. In addition, the damping is modeled as the Rayleigh damping, and first-order piston theory is applied for the supersonic aerodynamic load. Results are obtained for the thermal post-buckling behavior, and linear flutter analysis of FG panels with a damping effect is performed to search for the origin of the flutter. The numerical data are validated through a comparison with the previous works, and the effects of structural damping are discussed in detail for various cases.