The mechanical behavior of composite corrugated core coated with elastomer for morphing skins

Abstract

Coated composite corrugated panels have wide applications in engineering, especially in morphing skins where extreme anisotropic stiffness properties are required. The optimal design of these structures requires high-fidelity models of the panels that would be incorporated into multi-disciplinary system models. Therefore, numerical and experimental investigations are required that retain the dependence on the nonlinear static and dynamic behavior of these structures. Considering the nonlinear effects due to the material properties and mechanism of deformation, the mechanical behavior of composite corrugated laminates with elastomeric coatings is studied in this paper by means of numerical and experimental investigations. The importance of this work is that it provides detailed experimental and numerical models of the panel that can be used for further static and dynamic homogenization and optimization studies. In this regard, an investigation of the manufacturing method and an evaluation of the mechanical characteristics of the materials are presented. Then the tensile, hysteresis and three-point bending tests of the coated corrugated panels are analyzed and the mechanical behavior of the panel is simulated. The comparison studies demonstrate the accuracy of the finite element model to predict the mechanical behavior of the coated corrugated panels. Finally, two concepts to deal with the non-smooth surface of the panel during bending for the morphing skin application are proposed.

Design of three-dimensional origami structures based on a vertex approach

“…Using the vertex method can greatly facilitate the research on these topics. Furthermore, according to the mathematical meaning of the vertex method, we have successfully shown through an example the potential of the method to design origami structures between two given surfaces, which can lead to broad applications such as morphing wing design [29].…”

Sandwich Structures with Prismatic and Foam Cores: A Review

“…Although significant efforts have been devoted to research into adaptive structures and morphing aircraft, examples of practical solutions are still very few. Dayyani et al studied the tensile, hysteresis and flexural performance of coated composite corrugated cores by means of numerical and experimental investigations. They proposed two concepts to improve the non‐smooth surface of the panel during bending .…”

The mechanics of composite corrugated structures: A review with applications in morphing aircraft

“…(a) Corrugated core with elastomeric coating [33] (b) Twisted bi-stable corrugated core [22] (c) Curved corrugated sheet and some of its global deformations [23] (d) Schematic of bi-directional corrugated core [26] (e) Schematic of corrugated bi directional core, [27] (f) Schematics of Hierarchical corrugated core sandwich panel [28] (g) PMI foam filled hierarchical corrugated sheet Kazemahvazi et al [21] (h) Double wall corrugated concept Previtali et al [30] (i) Schematics of extruded pyramidal lattice truss sandwich structure, [32] Figure 1: Corrugated structures developments and concepts…”

“…Hence numerical and experimental investigations were required which maintain the dependence on the nonlinear static and dynamic behaviour of these structures. Dayyani et al [33] noticed this necessity and studied the nonlinear effects of the elastomeric coating and the mechanism of deformation of the composite corrugated core. They performed a series of experiments such as: static and cyclic tensile tests on the standard samples of composite laminates and elastomeric strips; static and cyclic tensile tests on the composite corrugated skin with and without elastomeric coating and three-point bending test on the coated corrugated skin.…”

“…The cyclic loading behaviour of composite corrugated skin for morphing applications, where the source of cyclic stresses may be the aerodynamic flow over the skin or the actuator, is important. In this regard, Dayyani et al [33] investigated the cyclic loading behaviour of the corrugated skin with and without elastomeric coating before and after the elastic limit and compared the energy dissipation in each case. It must be mentioned that the authors of this paper interpreted the limit in which the delamination cracks initiated and started dissipating the strain energy of the structure as the elastic limit.…”