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玻璃纤维增强树脂基复合材料(Glass Fiber Reinforced Plastic,GFRP)由于其良好的电绝缘性和力学性能,被作为北京正负电子对撞机束流管支撑法兰的制作材料。北京电子对撞机运行时,将对束流管及其支撑法兰产生大量γ和中子辐射。研究发现,玻璃纤维增强环氧树脂基复合材料长期处于γ辐射环境中,其力学性能会发生变迁。本文对由20kGy、100kGy、200kGy剂量γ辐照前后的GFRP试件进行拉-拉疲劳实验研究,发现γ辐照对低周疲劳阶段的疲劳寿命影响较为明显,而对于高周疲劳阶段疲劳寿命影响不大。基于Hwang和Han提出的假设,建立了拉-拉疲劳双参数疲劳寿命模型,并验证该疲劳寿命模型的准确性。利用扫描电镜对试件进行观察,发现辐照后环氧树脂基体出现碎片,环氧树脂与增强玻璃纤维的黏结界面受到破坏,但辐照对玻璃纤维影响程度较小。红外光谱图显示环氧树脂在辐照过程中降解反应较交联反应占优势。
Due to its good electrical insulation and mechanical properties, Glass Fiber Reinforced Plastic (GFRP) has been used as the material for the fabrication of Beijing-Nippon Electron Collider beam tube flanges. When the Beijing electron collider is operating, a large amount of γ and neutron radiation will be generated on the beam tube and its supporting flange. The study found that glass fiber reinforced epoxy matrix composite material in a long-term γ radiation environment, its mechanical properties will change. In this paper, the pull-pull fatigue tests of GFRP specimens before and after γ-irradiation at doses of 20kGy, 100kGy and 200kGy were carried out. It was found that the γ-irradiation had a significant effect on the fatigue life of the low-cycle fatigue stage and the fatigue life of the high-cycle fatigue stage Not big. Based on the hypothesis of Hwang and Han, a two-parameter fatigue life model of fatigue and pull-pull fatigue was established and the accuracy of the fatigue life model was verified. Scanning electron microscopy (SEM) was used to observe the specimens. It was found that the irradiated epoxy resin matrix was fragmented and the bonding interface between the epoxy resin and the reinforced glass fiber was damaged. However, the irradiation had little effect on the glass fiber. Infrared spectra showed that the degradation reaction of epoxy resin was more dominant than that of crosslinking reaction during irradiation.