Design And Research Of Flexible Skin For Adaptive Morphing Structures

Morphing aircraft based on smart materials and structures is one of the main development directions of the advanced flight vehicle,and of which the key technology is the design of flexible skin.This paper develops design and research work of flexible skin which is based on adaptive bump inlet and morphing aircraft wing.The flexible skin proposed in this paper should not only satisfy the needs of deformation and load,but also deform smoothly and consecutively.A kind of round spring fiber arranged periodically is designed according to the application requirement of flexible skin.The mechanical properties of the composite material based on round spring fiber are analyzed by representative volume element method.In addition,the in-plane tensile behavior and out-of-plane bending characteristics of round spring fiber reinforced composite laminate are studied deeply,which deduce the equivalent tensile elastic modulus and bending deflection.Simulation based on round spring fiber reinforced composite are developed by using MATLAB and ABAQUS.The finite element method shows the change laws of the equivalent tensile elastic modulus.An adaptive bump inlet used flexible skin which is based on round spring fiber reinforced composite is proposed according to the deformation and load needs of bump inlet.The flexible skin sticks to the bump of the aircraft.By loading pressure,the flexible skin will deform into a bump.The deformability and the value of pressure are analyzed by building bump model which is based on round spring fiber reinforced composite.A kind of zero Poisson's ratio mixed cruciform honeycomb is proposed in this paper.Mechanical properties are studied by optimizing the topology of cruciform honeycomb.Simultaneously,simulation and experiment are developed to verify the theoretical models.