The Design And Theoretical Research Of Fold-Development Program Of Film Reflective Surface Structure

In recent years, with the development of the space industry, thin file reflector structure with its feature of lightweight, curl characteristics such as small volume, easy to fold and unfold and so on. It received wide attention and application of scientific research personnel, has a broad application prospect. At present, the study of film reflective surface structures mainly focuses on static analysis. Relatively little has been published about the form and process.On the basis of the film reflector structure research status at home and abroad, the numerical simulation of the process of the film structure and the deployable space structure with scissor-like element is carried out. And emphasizes on the evaluating indicator of the process. The main research content is as follows:Using nonlinear finite element software ABAQUS to carry out the numerical simulation of the film structure. The calculation module and the calculation unit during the simulation is to be selected. Taking advantage of the material properties user subroutine VUMAT to do the correction of the stress distribution of correction of ABAQUS itself. The uniaxial tension test was carried out to test the material properties of the polyimide film, it can determine the material parameters used by numerical simulation. Another uniaxial tensile experiment was carried out on the creased membrane to determine the equivalent elastic modulus, than the material parameters of the part near the crease can be determined in the numerical simulation. To simulate the deployable process of miura unit, then put the flatness index and the maximum mises stress to be two evaluating indicators to evaluate the results of numerical simulation. By changing the loading point/driving point quantity and loading form and the loading time.Research on the deployable process of the film reflector structure, and give a brief introduction to the film reflector structure which based on the simulation. Taking on the form-finding to the side length of one meter of an isosceles right triangle, to find out that could satisfy the requirement of balance condition and the structure's surface shape. We use the Miura's fold solution to fold the film, and by changing the parameters ? and L, we can have five different folding solution of the model. We use ABAQUS to simulate the deployable process of five models. Comparing to the deployable process of the different Miura's fold solution by anlysis the five model's flatness index, stress magnitude, the length of the crease and the folding rate. Explore the change of the parameter which can influence the deployable process.Do the model design and model making of the deployable space structure with scissor-like element, install the control system of the entity model to make the deployable process controllable. The numerical simulation of the deployable process of the space structure with scissor-like element. Then do the analysis of the consistent defect mode method of the deployable process which based on the eigenvalue buckling mode. By change the magnitude of the initial defects, to research in the influence of different initial defects to the space structure with scissor-like element.