γ和中子辐照作用下GFRP机械强度和热性能变迁及其微观机理研究

高强度、高电绝缘、高热绝缘玻璃纤维增强材料（GFRP）是高能物理和核物理实验等γ和中子共同辐照环境中支撑设备的重要原材料，其机械强度在单独γ或单独中子辐照下将发生变迁从而影响支撑设备的结构安全。因此，开展γ和中子共同辐照下GFRP机械强度和热性能变迁的研究具有重要科学意义和实用价值。本项目系统研究γ和中子辐照类型和剂量变化条件下GFRP性能的动态变化规律，给出交叉辐照与材料性能参数之间的对应关系，进而揭示共同辐照时两种辐照对材料性能的交互作用规律；通过观测辐照前后材料的微观形貌和分子结构变化，建立γ和中子联合辐照条件下GFRP内部结构反应机理理论构架；建立辐照因子概念，将其引入现有强度方程，构建适合γ和中子辐照条件的GFRP机械强度理论模型。预期项目研究成果能为辐照环境中GFRP装置的结构安全保障提供科学依据，为具有抗辐照性能GFRP材料的设计和制备提供理论和技术支撑。

Glass fiber reinforced plastic (GFRP) with the character of high structural strength, high electrical insulation and high heat insulation is used as the raw material for the support equipment under the γ and neutron irradiation in the high-energy physics and nuclear physics experiments. Studies have shown that GFRP’s mechanical strength changed under the single γ or single neutron irradiation, so the structural strength of the supporting equipment was affected. Therefore, it is great scientific significant and practical valuable to carry out the research of the mechanical and thermal properties of GFRP in the combination irradiation environment of γ and neutron. The project will systematically study the dynamic change rules of GFRP performance under the condition of the different type and dose of γ and neutron irradiation, and the correspondence between the cross irradiation and the GFRP properties can be given. Then the interaction of γ irradiation and neutron irradiation on the GFRP properties will be elucidated when two types of irradiation affects together. By the means of observing the change of morphology and molecular structure of the material before and after irradiation, the reaction mechanism theory of internal structure of GFRP under the combination irradiation environment of γ and neutron can be built. A concept, the irradiation factor will be built and introduced to the existing strength equation, and then a theoretical model can be constructed to describe the relation between the type and dose of the irradiation and the GFRP mechanical strength. The results of the project will provide an important security for the structure of the GFRP supporting equipment in the irradiation environment, and offer a theoretical and technical support for developing and manufacturing GFRP of irradiation resistance in the future.