利用FBG传感器测试高温合金和陶瓷基复合材料的应变

Strain measurement of superalloy and ceramic matrix composites by using FBG sensor

利用光纤布拉格光栅(FBG)应变传感器测量了高温合金和陶瓷基复合材料的应变特性,并与电阻应变片的测量结果进行了对比分析.将FBG应变传感器与电阻应变片分别粘贴在高温合金和陶瓷基复合材料试件的正、反面上,利用力学试验机对2种试件施加载荷,分别利用FBG解调仪和应变测试仪对FBG应变传感器和电阻应变片的信号进行实时解调.研究得出:FBG应变传感器与电阻应变片在一定的应变范围内,测量结果符合较好.因此,FBG应变传感器可代替电阻应变片,实现对材料的应变测量.

The strain characteristics of superalloy and ceramic matrix composites were measured by fiber Bragg grating(FBG)strain sensor,and the measurement results were compared with those measured by resistance strain gauge.FBG strain sensor and the resistance strain gauge were respectively pasted on the positive and negative sides of the superalloy and ceramic matrix composite specimens.The mechanical testing machine was used to apply given load to the two specimens,and the signals of FBG strain sensor and the resistance strain gauge were demodulated in real time by FBG interrogator and the strain recorder respectively.The results showed that FBG strain sensor and the resistance strain gauge were almost consistent within a certain range of strain.Therefore,FBG strain sensor could be used to measure the strain of materials by replacing the resistance strain gauge.