| With the rapid development of science and technology,development of new materials,the extension of mechanical equipment life and the introduction of intelligent thought lead to higher requirements for on the material structure safety and reliability problems of the introduction of are put forward.And smart structure is the very important research direction in the field of material in the 21 st century.Composite material damage fast self-healing is the key technology for solution to realize the intelligent composite material structures.So new self-healing method put forward for smart composite structure damage has important scientific significance and application prospects.This paper developed multi-functional liquid core optical fiber and its application in composite material intelligent structure biomimetic self-healing key technology research around the key problems and frontier research of structural damage self-healing composites.Main research content and innovation work in paper are as follows:(1)The research on development mechanism and performance of the core material for multi-function(sensing and repairing)optical fiber.Properties and preparation mechanism of the light curing agent are the key technologies in the study of smart composite structure biomimetic self-healing and liquid core optical fiber.The properties of light curing agent includes spectral characteristics,refractive index,the performance of light cure rate and hardness after cured and adhesion of composite materials,etc.They are all key problems for studying the light curing agent as the fiber core and the fixing agent.These parameters directly influence the properties of multifunctional liquid core optical fiber and its composite structure damage repair effect.Therefore,in this paper,various performance parameters of light curing agent are analysis and compared through a large number of experiments.The optimal performance of the light curing agent is chosen as the final core material of the liquid core optical fiber.Research results show that this kind of liquid core light curing as fixing agent of light meets practical requirements in self-healing experiments.(2)The study on structure design,mechanism and characteristics of multifunctional liquid-core optical fiber.Multifunctional liquid core optical fiber is chosen as the core element,so its structure designing,mechanism of light transmission and sensing function are the key research questions to finish the intelligent biomimetic self-healing of composite structures.This paper proposes a new type of liquid core optical fiber with light curing agent for the fiber core,quartz as the cladding material and polymer optical fiber as the light window closed liquid core optical fiber ports.And theory analysis of the light transfer mechanism of this kind of liquid core optical fiber is conducted.Transmission properties of liquid core optical fiber are determined through a lot of experiments and the attenuation coefficient of the multipurpose liquid core optical fiber is measured.This article also on bearing capacity of the multi-functional liquid core optical fiber was carried out experiments and research,in theory,puts forward a liquid core optical fiber before and after the load bearing luminous flux change in the research method of multi-functional liquid core optical fiber as the sensing element in the application of intelligent composite material structure to provide the theoretical and experimental basis.Besides,the load-bearing properties of multi-function liquid-core optical fiber is studied,and a research method of luminous flux variation in fiber core is put forward a before and after liquid core optical fiber loaded.Results show that the relationship between the liquid core optical fiber output optical power and micro-displacement is the approximate linear relationship under 20-40?m loading.It provides theoretical and experimental basis for further application.(3)Composite material plate type structure damage self-healing research based on multifunction liquid core optical fiber.Self-healing function of Multi-functional liquid core optical fiber is the key technology to realize biomimetic self-healing of intelligent composite material structure.The paper conducted application researches on the repair function of multi-function liquid core optical fiber in composites structural damage self-healing.To protect the repair agent in multi-function liquid core optical fiber,this paper develops a kind of optical fiber coating layer to protect the fiber and toughening fiber.Then through the analysis the light transmittance of composite materials to determine the buried depth of multifunctional liquid core optical fiber embedded in composites.The damage crack propagation way of the composite material structures are analyzed and discussed.By the method of three point bending,effects on the bending properties of the composite structure for embedded multifunctional liquid core optical fiber is also studied.Finally,damage self-healing properties of the composite structures and the influences of various repair agents on the composite structure damage are studied and analyzed.Research results show that when damage happened,liquid core optical fiber can release repair agent timely,and under the radiation of short-wave repair light,repair will be completed.It is known that not only the bending properties after repaired can be recovered to 65%,but also repaired liquid-core optical fiber still has a certain sensor function.It implementes composite material plate type structures damage self-repairing based on liquid core optical fiber and provides a solid experimental basis for the liquid core optical fiber as the repair component in application of typical intelligent composite material structures.(4)The design of damage monitoring system and method for smart structures based on the typical multifunctional liquid core optical fiber.A remote monitoring system for typical smart composite structure damage status of based on a multi-functional liquid core optical fiber is proposed.This remote monitoring system combines key technologies of optical fiber sensing,photoelectric detection,ARM embedded and wireless communication.And in order to verify data acquisition function of the designed remote damage monitoring system and completing the monitoring for the intelligent composite material structure damage,this article conducts bearing experiments.Results show that the proposed location identification method based on GA-SVM for typical intelligent composite material structure is feasible.On the key technical problems of composite structure damage how to implement the light source lighting the damage in a timely manner,and make sure highly efficient of light source and the realization of the damage bionic self-healing for composite structures,this paper introduces the concept of fuzzy in the size of the crack repair light and the opening and closing time of light source and proposes a kind of biomimetic self-healing system and method for typical composite structural damage.The system controls the opening and closing of repairing the light source by controlling the electromagnetic relay and controls the time of repair light open and close using the fuzzy control algorithm.Thus,intelligent bionic structure of a typical composite material damage self-healing is realized.(5)The application of multifunctional liquid core optical fiber in the typical composite material smart structures.In order to realize the multi-functional liquid core optical fiber in the application of intelligent composite material structure,and the validation of the injury of remote monitoring system,and the effectiveness of damage location and damage bionic self-healing method for the typical smart composite structures,based on typical of multifunctional liquid core optical fiber for smart composite structure damage location and damage the bionic self-healing experiments are conducted.Experimental results show that the designed monitoring system,and the damage location and damage of self-healing method can complete the typical smart composite structure damage location and biomimetic self-healing.Besides,and multifunctional liquid core optical fiber and its intelligent composite structures can implement self-repairing many times in theory. |
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