Research And Design Of A Deployable Structure Based On Shape Memory Polymer Composites

Extensible structures are widely used.According to the difference of deformation mechanism of structural elements,each kind of extensible structure has its own unique mechanical properties and design scheme,which needs to be analyzed according to the specific situation.For the shape memory material,because of its high intelligent and programmable control characteristics,it undoubtedly adds more functions to the extensible structure.In this paper,a new type of shape memory polymer rubber composite shape memory structure is designed and analyzed for the compression deformation of multi-stage extensible structure,and a set of method is established to design the new type of extensible structure through the process of theoretical analysis,finite element solution and experimental verification.In this paper,the theoretical design is based on the simplified assumptions of each model,the theoretical analysis of structural mechanics and the theoretical analysis of polymer viscoelasticity;Through the preparation of samples and mechanical tests,ABAQUS finite element simulation is carried out according to the known material parameters and the relevant mechanical property characterization parameters obtained from the tests,which verifies the accuracy of the finite element solution results;A simplified structural model based on multi segment unfolded structure is proposed.The theoretical analysis,ABAQUS finite element modal analysis,finite element simulation and sample test are carried out,and the geometric design scheme of the simplified model with the best mechanical properties is given.According to the geometric parameter design scheme,a shape memory ring structure is adopted,which has a large restoring force and facilitates the recovery deformation of the structure;At the same time,the shape fixed stiffness of the shape memory ring is large,which makes the structure not easy to rebound due to external force interference.Based on the shape memory ring structure,the model of multi-stage deployable structure was simplified and optimized.Finally,a three-stage flexible deployable structure composed of rigid rubber collapsible expansion section,epoxy shape memory polymer memory ring support system and pores was designed.The mechanical behavior of the structure during compression deformation was simulated by finite element simulation.