基于FBG传感技术的复合材料T型加筋板低速冲击在线监测研究

ON-LINE MONITORING OF COMPOSITE T-STIFFENED PANELS SUBJECTED TO LOW-VELOCITY IMPACT BASED ON THE FBG SENSOR TECHNOLOGY

将布拉格光纤光栅(Fiber Bragg Grating,简称"FBG")埋植在复合材料加筋板结构三角填充区,在线监测复合材料加筋板冲击过程及压缩过程的应变信号。研究了冲击点位置、冲击能量对FBG传感器应变监测性能的影响,分析了FBG传感器对复合材料T型加筋板冲击及压缩过程监测的精确性。结果表明:在相同冲击能量条件下,随着冲击点位置与FBG传感器距离的增加,FBG传感器测得的复合材料T型加筋板应变值呈下降趋势;当复合材料T型加筋板出现较为明显的损伤时,FBG传感器未发生断裂失效。将FBG传感器埋植于加筋板的三角填充区内,在压缩过程中,FBG传感器反射波谱保持单个波峰且形状未发生变化,初步实现了对复合材料T型加筋板冲击及冲击后压缩过程应变信号的在线监测。

The FBG sensors,embedded in the triangle area of the T-stiffened panels,were employed to onlinemonitor the strain of the composite T-stiffened panels during its impact testing and compression testing. The effect of impact location and impact energy on the strain measured by the FBG sensors was studied. The accuracy of the FBG sensor during the impact and the compression was analyzed. The experimental results showed that the max-strain of impact measured by the FBG sensors decreased with the increase of the distance between the location of impact and the FBG sensors（ impact distance） under the same impact energy. The FBG sensors did not fail while visible damages are induced in composite T-stiffened panels,and the spectrum of the FBG sensor maintained single peak,the accuracy of the FBG sensor was assured. The procession of the impact and the compression monitored by FBG sensors on-line were initially realized.