The Mechanical Properties Characterization Of Shape Memory Composite Materials And Its Application In The Spatial Developable Structure

As an important part of the spacecraft, spatial developable antenna plays an inportant role in the data transmission of spacecraft and console. At the same time with the advances in materials science, a kind of new smart materia l which can realize self-locking, self supporting and adaptive intelligent active large deformation, named shape memory polymers(SMPs), with its advantages of light quality, large shape deformation rate, and low cost,has become the highlight of research at home and abroad. So it can be predicted, if the intelligent materials with excellent performance are taken as the bearing material, its application prospect in the field of aviation, aerospace and energy will be incalculable.This paper is based on the basic mechanics performance of the shape memory polymer and its composites characteristic as the starting point, to design and produce a kind of intelligent hinge unit based on shape memory materials and apply the intelligent hinge unit to spatial developable antenna stru cture. Among them in terms of the basic mechanics performance of material characterization, this paper describes the preparation methods of shape memory polymer and its composite materials, and then make the material as test pieces through the laser cutting material. Later the nano indentation test of shape memory polymer exactly represent the hardness of this kind of epoxy group shape memory polymer. And then in the analysis of shape memory polymer and its dynamic mechanics and static mechanics of composite materials, and the relevant basic mechanical properties characterization, are respectively realized by static test of the material viscoelasticity, dynamic viscoelasticity test and tensile test.In the design of intelligent hinge unit, this paper is based on theory modeling analysis of shape memory composite laminated shell and ABAQUS finite element simulation analysis, optimize and design the basic size of shape memory composite layer. After that a similar approach is used to design and produce a series of intelligent hinge principle prototype, and through the intelligent hinge test to investigate the feasibility of relevant design.Finally in spatial developable antenna based on intelligent hinge unit, this paper respectively starts from the kinematics and dynamics analysis of developable antenna. On the one hand, in the analysis of kinematics modeling, through setting up kinematical analysis model on spatial developable antenna, build up various kinematics equations of antenna center mass. And using the ADAMS virtual prototype technology, simulate the curve of basic motion parameters of the antenna enter mass with time. On the other hand, in the dynamic analysis, establish the analytical dynamic model of developable antenna based on the semi-analytical strip transfer function method, then using the ABAQUS finite element analysis software based on intelligent hinge unit of developable antenna to analyze the modal, and get the modal characteristic of the developable antenna. At last, space microgravity environment ground simulation experiment through suspension method has verified the shape memory polymer and its composite materials and intelligent hinge unit based on the material have a certain application value.In conclusion, through the basic mechanics performance of the shape memory polymer and its composite materials characterization in this paper, we have a profound understanding of the excellent properties of the research of intelligent materials, and as an opportunity for space based on intelligent hinge unit to analyze theoretically and analysis and simulatively, which proves the rationality of the design of intelligent hinge structure. Finally through the analysis and experiment research of the kinematics and dynamics and developable antenna, we verified the feasibility of shape memory materials applied in deployable structure.