Vibration and Flutter of a Honeycomb Sandwich Plate with Zero Poisson’s Ratio

Abstract

A honeycomb is a kind of excellent lightweight structure and a honeycomb sandwich plate with zero Poisson’s ratio (ZPR) core is used widely in morphing structures. In this paper, a sandwich plate composed of a honeycomb core with zero Poisson’s ratio is analyzed for free vibrations and flutter under supersonic airflows. The equivalent elastic parametric formulas of the honeycomb core for zero Poisson’s ratio are proposed. The models are compared for their natural frequencies by theoretical and finite element methods respectively, which verifies the validity of the equivalent elastic parametric formulas and the model for the honeycomb sandwich plate with zero Poisson’s ratio. The influence of the geometric parameters of the honeycomb plate on the vibration frequencies is obtained. Three kinds of honeycomb cores, namely, regular hexagon, auxetic and hybrid with zero Poisson’s ratio, are compared through natural frequencies of the sandwich plate. It is found that the frequency of the zero Poisson’s ratio honeycomb sandwich plate is the second one when the other parameters are the same. The flutter of the honeycomb plate is analyzed by using the first order piston theory under supersonic flows. The critical flutter velocity of the plate is obtained, and the influence of geometric parameters of the honeycomb plate on the critical flutter velocities is obtained.

Aeroelastic analysis of a lightweight topology-optimized sandwich panel

“…Also, the only aeroelastic analysis of foam-filled composite corrugated sandwich plates was done recently. 12 Zhang et al 13 studied an investigation on the vibrations and flutter of a honeycomb sandwich plate with zero Poisson’s ratio under supersonic airflow. Therefore, developing innovative ways to improve the aeroelastic properties of aerospace high-speed vehicle panels is essential.…”

Experimental and Numerical Flutter Analysis Using Local Piston Theory with Viscous Correction

“…Approximate unsteady aerodynamic models, including piston theory [4], Van Dyke second-order theory [5], shock-expansion theory [6], Newtonian impact theory [7] and lifting surface/panel approaches [8], are based on linear potential flow theory and the quasi-steady flow assumption, which produce sufficiently accurate results at limited AOAs [9]. Therein, piston theory is attractive at the stage of preliminary design and has been extensively used and developed [10][11][12][13][14]. Local piston theory (LPT) [15] integrates classical piston theory with the CFD method, ensuring both high computational precision and efficiency.…”

The Moisture Diffusion Equation for Moisture Absorption of Multiphase Symmetrical Sandwich Structures

“…Sandwich structures have been widely used in daily life and engineering, such as automotive, sport equipment, building and aerospace, since they present good energy absorption properties, lightweight characteristics, and good designability [1][2][3][4]. Despite these advantages, if the materials used in the sandwich structures are hydrophilic materials, they have the drawback of high hydrophilicity when they are exposed to hydrothermal environments [5][6][7].…”