纤维增强复合材料静动态拉伸形变的碳纳米纸传感器监测

Deformation monitoring of the fiber reinforced composite in static and dynamic tension with buckypaper sensor

碳纳米纸可用作应变传感器监测纤维增强复合材料在静动态拉伸状况下的变形问题,这主要是通过测量与玻璃纤维增强复合材料一体固化成型的碳纳米纸传感器电阻变化来实现。试验结果表明,静态拉伸试验中,碳纳米纸传感器具有非常灵敏的应变传感性,在0~11 021με的应变范围内,其应变传感系数可达到22.1,在弹性极限点位置（应力为210MPa）电阻变化率发生突变;拉-拉疲劳试验中,当最大拉伸应力（215 MPa）大于弹性极限时,残余电阻变化率随疲劳周期增加明显加快;碳纳米纸传感器具有非常好的应变监测同步性和稳定性,完全可满足复合材料结构健康监测需要。

Buckypaper is usually used as a strain sensor to monitor the damage of fiber reinforced composites subjected to tensile and cyclic fatigue loadings. This result is achieved by measuring the electrical resistance change in the buckypaper sensor cocured with the composites. The test results show that the buckypaper sensor has a very high strain sensitivity in static tensile test and the strain sensing factor can reach 22. 1 in the strain range 0 ~ 11 021 με,The rate of change in resistance increases significantly at the elastic limit point（ corresponding to the stress of 210 MPa）; the change of residual resistance increases significantly with the fatigue cycles when the maximum fatigue stress（ 215 MPa） is greater than the elastic limit point in the tension-tension fatigue test. Buckypaper sensor has a very good stability and synchronization for strain monitoring and can meet the needs for health monitoring of composite structures.