LPG在复合材料实时监测中的应用研究

树脂传递模塑工艺能制造出高质量和形状复杂的复合材料,目前已广泛地应用于舰船、航空航天、国内各工业等领域.在线监测在RTM中是关键环节,可以实时控制最终产品质量.作为一种新型的光纤实时传感系统,长周期光纤光栅传感器受到了越来越多的关注,本工作采用长周期光纤光栅传感器监测RTM工艺的流动前沿,详细地研究了各种工艺条件对LPFG损耗波峰的影响,探讨了LPFG在RTM工艺中的应用情况.

Real-time Cure Monitoring of Composites Using Long-period Gratings

Resin transfer molding(RTM) processes are used to manufacture high quality and complex-shaped composite parts in the automotive,marine,aerospace and civil industries.On-line sensing plays an important role in controlling the quality of the final product in the RTM manufacturing environment.In this paper,the long-period grating technology,a new fiber optic real-time sensor system,was developed to monitor flow front progression.The sensor operation and characterization under various process conditions were discussed in detail.The experiment results showed that LPFG sensors were robust and reliable to detect the arrival of resin at pre-selected locations in structures with low-medium fiber volume fraction while limited at different depths in structures with high fiber volume fraction.