Flutter characterization analysis of supersonic composite wall plates

DOI:	10.11809/bqzbgcxb2025.03.002
Keywords:	supersonic; composite wall plates;aerodynamic heating; flutter;layering method
Abstract:	This article considers the thermal stresses induced by temperature and the changes in mechanical properties of materials at high temperatures. It uses the first order piston theory to calculate aerodynamic forces and establishes a finite element model for thermal flutter of composite thin walled structures based on Hamilton’s equations and the virtual work principle in a steady temperature field. The study investigates the influence of different geometric shapes of composite wall panels and the arrangement of composite layers on thermal flutter, and further explores the underlying mechanisms. The research results demonstrate that the triangular wall panel exhibits the highest thermal flutter velocity and frequency, followed by the trapezoidal wall panel, while the rectangular wall panel has the lowest thermal flutter velocity and frequency. As the temperature rises, the thermal flutter velocity and frequency of all three types of wall panels decrease. The triangular wall panel experiences thermal flutter mode instability, leading to ‘jumping’ phenomena in the thermal flutter curve. The thermal flutter velocities of symmetric orthogonal and non symmetric angle ply arrangements are higher than those of non symmetric arrangements. Compared to solely changing the stiffness of the structure, altering the arrangement of coupled modes in thermal flutter can significantly increase the margin of safety.
Issue:	Vol. 46 No. 3 (2025)
Published:	2025-03-31
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