Morphing structures need to simultaneously change shape and carry loads. To satisfy the design requirements of a morphing wingtip, an equivalent model of corrugated panels is established based on the energy method. The model can represent the stiffness properties of the corrugated structures effectively and predict the failure strain of the corrugated structure by converting the effective deformation of the corrugated panels to the local strain in the structure. The equivalent model is verified by experiments and the average error between the analytical results from the equivalent model and the test results is less than 10%。The influence of the corrugation geometry on the failure strain and bending stiffness of the corrugated panel is investigated by parametric analysis. Finally, the corrugated panels are optimized to meet the requirements of shape-changing and load-carrying, which further evaluates the stiffness and strength properties of the corrugated structures and provides the guidance for the design of the morphing wingtip.
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