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光纤光栅对复合材料固化过程中的应变和温度具有非常高的灵敏度。提出了利用双光纤光栅传感器监测复合材料真空袋成型固化过程的温度/应变变化,获得凝胶点信息,从而优化加压时机。实验结果表明,光纤光栅和动态力学分析法(DMTA)确定的凝胶点信息(凝胶温度/时间)非常一致,扫描电子显微镜(SEM)表明加压点优化后制备的复合材料具有最佳界面,中心层未出现分层情况。该方法可实现对复合材料固化工艺的监测与优化。
Fiber gratings have a very high sensitivity to strain and temperature during the curing of composites. The temperature and strain changes during the forming and curing of the composite vacuum bag are monitored by using a dual fiber grating sensor, and the information of the gel point is obtained to optimize the timing of pressurization. The experimental results show that the gel point information (gel temperature / time) determined by optical fiber grating and dynamic mechanical analysis (DMTA) are very consistent. The scanning electron microscopy (SEM) shows that the composites prepared by optimized pressure point have the best interface No delamination occurred at the center level. This method enables the monitoring and optimization of the composite curing process.