树脂传递模塑成型注模过程的光纤光栅监测

有效监测树脂传递模塑成型(RTM)的树脂注模过程对于生产大型共固化复合材料结构十分必要.本文重点讨论利用光栅传感器监测注模过程的树脂流动问题.本文在复合材料层的不同位置布置了1个温度传感器用来监测温度,2个应变传感器用来监测树脂流动前沿到达时间,试验结果表明50 min和115 min时树脂流动前沿分别到达No.1和No.2应变传感器,166 min时完成注模,此时监测温度为最低的24.59℃.光栅传感器完全可实现树脂传递模塑注模过程的监测.

Monitoring the Injection Process of Resin Transfer Molding with Fiber Bragg Gratings

It is essential to monitor the resin injection process of Resin Transfer Molding (RTM) for manufacturing large integrated co-cured structures. This paper discusses the efforts in developing fiber Bragg sensors for monitoring the flow of the resin during the infusion process. Three Fiber Bragg Gratings (FBG) sensors are put into the composite layers at different location, one is used to monitor the temperature and the two others are used to detect the arrival of the resin flow front. The experimental results show that the arrival time of the resin flow front to the No.1 and No.2 sensor are 50 min and 115 min, respectively. The injection end time is 166 min at the maximum temperature of 24.59 ℃. The network of FBG sensors would be very useful to provide information of resin injection of RTM procession.