光纤布拉格光栅传感器监测环氧树脂固化收缩研究

Curing Shrinkage Monitoring in Epoxy Resin by Fiber Bragg Grating Sensors

采用光纤布拉格光栅传感器对处于自由状态的热固性树脂在固化工艺过程中的温度和应变进行了实时在线监测,并且利用传感器的测量数据得到了固化后树脂在冷却阶段的热膨胀系数。结果表明:应用光纤布拉格光栅传感器能够实现从树脂凝胶点开始对固化过程中由于体积变化导致的树脂内部应变变化实时在线监测;传感器测得的固化后树脂在冷却阶段的热膨胀系数结果与热膨胀仪的测量结果相当;利用光纤布拉格光栅传感器测量热固性树脂的固化收缩具有较高的灵敏度和可靠性。

Temperature profile and the build-up of strains throughout the curing process were in-suit monitored by fiber Bragg grating （FBG） sensors embedded into an epoxy sample. The volume change of the resin was free due to the experimental set. The coefficients of thermal expansion of full-cured resin in cooling stage were also calculated from FBG＇s measurement data. The results showed that FBG sensors could detect process-induced strains resulting from the volume change of the resin from the gel point until the end of curing. The coefficients of thermal expansion of full-cured resin in cooling stage determined by FBG sensors are comparable to the result of dilatometry. It is sensitive and reliable to determine curing shrinkage of thermoset resin using FBG sensors.