Reinforcement Structure Design And Electromechanical Analysis Based On Shape Memory Polymer Composites

As a new type of smart material,shape memory polymers are widely used in biomedical,robotics and aerospace fields due to their unique properties,but the application of shape memory polymers in industrial fields is rarely reported.In the oil field,the corrosion and damage of downhole pipelines is an important factor that seriously threatens the safe operation of oil wells.In the power industry,transmission cables run for a long time under high temperature,ultraviolet rays,rain,snow and strong wind.The insulation layer on the surface of the cable faces the problem of corrosion and damage,posing a threat to the safety of maintenance personnel.The large generator is a high-power electrical equipment that rotates at a high speed.The motor coil is a high-temperature and high-voltage component that runs at a high speed of 50 Hz.Under the action,heat shrinkage will occur,which will lead to the loosening of the original reinforcement structure,and the coil cann’t be fixed,causing it to wear and burn.In this paper,the subsidy pipe that can repair the damaged pipe is prepared by the wet winding process,and the deformation structure is designed according to the engineering requirements,the subsidy pipe can also be deformed underground,and can be accurately installed to the damaged part of the pipeline.The subsidy pipe needs to work in the oil well,and the medium in the oil well contains corrosive media such as crude oil,so the corrosion resistance test of the carbon fiber toughened resin-based material was carried out.The results showed that the properties of the material didn’t change significantly,proving that the material has excellent corrosion resistance.Aiming at the problem of repairing damaged cables,a hinged cable repairing tool is designed in this paper.The tool is a hinged structure with shape memory polymer as matrix material and glass fiber and carbon fiber fabric as reinforcement phase.The structure needs to withstand high voltage.The dielectric properties and breakdown properties of shape memory polymers and their composites were tested.The results show that the epoxy resin-based shape memory polymer has high withstand voltage performance,and the addition of fiber fabric also greatly improves the stiffness and strength of the hinge.Taking this electric repair hinge as the research object,the microstructure of the material after breakdown was observed,and the existing breakdown theory was revised to further improve the existing electric model.For the reinforcement of the motor,a spacer block based on epoxy resin matrix shape memory composite material is designed and fabricated in this paper.Glass fiber fabric was used as the reinforcing phase,and the stiffness of the pad was tested at different temperatures and fiber fabric contents.In order to be able to describe the mechanical properties of epoxy resin-based shape memory polymers in detail,related mechanical properties experiments were carried out on various polymers with different glass transition temperatures in this paper,and a new method in the process of heat transfer was proposed.The viscoelastic model of polymers was verified,and the results show that although there are certain errors,the model can describe the viscoelastic behavior of polymers to a certain extent.On the other hand,for the existing electrical breakdown model,this paper combines the previous research results to correct the electrical breakdown model.The original electrical breakdown model didn’t consider the effect of temperature.In this paper,the influence of temperature on the Young’s modulus of the material is considered,so that the original electrical breakdown model can be extended to a thermal breakdown model with temperature as a variable factor.