Study And Preparation Of Non-wall Microvascular In Composite Seif-healing

During the manufacturing and service of composite materials and their components,there are physical and chemical changes of each component material,and the performance dispersion is relatively large,which makes the surface and interior vulnerable to various kinds of damage and defects,leading to the premature failure of components,causing catastrophic accidents and huge economic losses.Self-healing materials should have good mechanical properties,and the main factors that affect their mechanical properties are: the optimization of the distribution of microvascular carriers,the number of microvascular,and the structure of microvascular(with or without a wall).This study is based on the self-healing mechanism of external damage,and aims at optimization and preparation of the carrier in self-healing.The study focuses on the non-wall microvascular composite material carrier.The group intelligence algorithm NSGA-II was used to optimize the the diameter and number of the non-wall microvascular,and then the microvascular carrier was prepared and its mechanical properties were experimentally verified.Firstly,the repair ability of self-healing materials was characterized by tube density,the frictional head loss of a single microvasculature is calculated by using the method of fluid calculation without branch.The influence of microvascular on the mechanical properties of materials was evaluated by the percentage of microvascular in the volume of materials.The objective functions were the tube density,the frictional head loss along the single microvascular and the percentage of microvascular volume.NSGA-II was used to optimize the the diameter and number of the non-wall microvascular.Secondly,the precursors of hot melt adhesive were studied,and the temperature properties of the precursors were determined according to the temperature characteristics of the preparation and service of composite materials.The interaction law of material types,ratio and viscotemperature characteristics of precursor components was discussed,and a controllable expression model of viscotemperature characteristics of precursor was established and verified.Finally,the mechanical properties are verified.Self-healing materials were prepared and infrared thermal maps of microvascular were collected by infrared thermal imaging technology.The coherence of the material was verified.The fatigue properties of self-repairing materials with different microvascular diameters and quantities were tested by fatigue experiment.The experimental results show that the fatigue performance of materials with a small number of microvascular and a large diameter is weaker than that with a large number of microvascular and a small diameter.The research results of this paper provide technical support and theoretical reserve for the research and preparation of extrinsic self-healing carrier in damage self-healing of composite materials,which has important theoretical value practical significance.