ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Analysis of mechanical characteristics of flexible skin with tunable Poisson's ratio for morphing wing
Received date: 2022-07-01
Revised date: 2022-07-14
Accepted date: 2022-08-02
Online published: 2022-08-17
Supported by
National Natural Science Foundation of China(52192631);Science and Technology Project of Hebei Education Department(QN2023206);Shaanxi Province Natural Science Foundation(2022JQ-316)
To satisfy the requirements of in-plane large deformation and out-of-plane high bearing capacity for flexible skin imposed by the morphing wing of aerospace vehicle in realizing continuous variable span-wise bend， span-wise torsion， and sweep， we propose a hybrid metastructure skin structure with tunable Poisson’s ratio. This structure consists of a hybrid metastructure composed of a concave hexagon and a quadrangular star cell， with a flexible surface bonded on both sides. Based on the theory of beam buckling， the theoretical model of the relative elastic modulus in x and y directions and Poisson’s ratio in the xy plane of the hybrid metastructure cell is established. The accuracy of the theoretical model is verified by the relative errors of the theoretical and simulation results which is not greater than 10%. The effects of cell geometry parameters on the relative elastic modulus and Poisson’s ratio in the xy plane are studied. The results show that the thickness of the cell wall exhibits the largest effect on both， followed by the length of the horizontal cell wall， while the inner angle of the quadrangular star has the least effect on both. The in-plane deformation capacity of the metastructure is studied. The comparative analysis of the specific stiffness of four different metastructures shows that the new hybrid metastructure has more advantages in the specific stiffness within a certain range of cell angles. The results provide a theoretical basis for the application of morphing wing skin of high-speed aircraft.
Key words： aerospace vehicle; morphing wing; flexible skin; metastructure; Poisson's ratio
Songcheng JIANG , Hui YANG , Yan WANG , Hong XIAO , Yongbin LIU , Chuanyang LI . Analysis of mechanical characteristics of flexible skin with tunable Poisson's ratio for morphing wing[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2023 , 44(13) : 227748 -227748 . DOI: 10.7527/S1000-6893.2022.27748
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