Effect Study On Wrinkling Mechanical Behavior Of Fiber Reinforced Membrane

The rapid development of science and technology has promoted the continuous exploration of human beings in outer space.Due to its advantages of light weight,small size and easy folding,the membrane has broad application prospects in the aerospace field.However,because of the small bending stiffness,the membrane will be deformed out-of-plane to form wrinkles when a negative principal stress occurs in some local region,thereby affecting the surface smoothness and mechanical properties of the structure.The fiber can be embedded in the membrane and compounded into a fiber reinforced membrane to improve the stiffness and wrinkling resistant capacity of the membrane.Based on buckling theory and thin shell element,the nonlinear buckling analysis method is used to simulate the wrinkling deformation of rectangular fiber reinforced membrane structures under stretch or shear by using ABAQUS,and the effect of fiber direction,number,elastic of modulus and applied displacement load on wrinkling amplitude is discussed.The specific work and results of this paper are as follows:1.The models of fiber reinforced membrane under stretch or under shear with different fiber direction,quantity,elastic modulus and displacement load are separately established using ABAQUS software.Then define material properties,mesh,create analysis steps,impose constraints and boundary conditions,etc.,and obtain corresponding finite element models.2.Study wrinkles of fiber reinforced membrane under stretch and find that:a)Effect of fiber direction.With the same number and elastic modulus of fibers,the wrinkle amplitude is the largest when fibers are arranged in the longitudinal direction,the second in the bidirectional direction,and the smallest in the horizontal direction.And the wrinkle configuration is obviously different in the case where elastic modulus is 230 Gpa and 430 Gpa.When fibers are arranged in the longitudinal or bidirectional direction,the larger elastic modulus of the fiber causes fine wrinkles near the fibers,which has a certain influence on the wrinkling amplitude.b)Effect of fiber number and elastic modulus.It is found that the wrinkle amplitude is approximately zero when the fiber number increases to a certain extent under the same elastic modulus.And the wrinkle amplitude decreases with the increase of the elastic modulus at the same number.c)Effect of displacement load.The situation that fibers are arranged in the horizontal direction is similar to that of the membrane,the wrinkling amplitude increases first and then decreases with the increase of the displacement load,and the wavelength and the wavelength decreases with it increases.When fibers are arranged longitudinally or bidirectionally,an increase in the displacement load will result in the appearance of small wrinkles and the amplitude is affected by it.3.Studying wrinkles of fiber reinforced membrane under shear,we found that different direction,quantity and elastic modulus of fiber have a very small impact on the wrinkle amplitude and configuration of fiber reinforced membrane within elastic modulus of the fiber we provided.By the finite element analysis of the fiber reinforced membrane,it can be concluded that the direction,number and elastic modulus of the fiber have an influence on the configuration or amplitude of the wrinkles to some extent for the fiber reinforced membrane under stretch.And controlling the direction,number,elastic modulus of fiber can achieve the purpose of changing the wrinkle shape or even suppressing the wrinkles.However,for the fiber reinforced membrane under shear,fibers with greater elastic modulus are required to achieve it.