Damage localization of fiber-reinforced composites in variable temperature domain
Fiber-reinforced composites have become the first choice for many engineering structures due to their excellent properties such as light weight,high strength,easy molding,and better design ability.However,their structures are prone to various damages,which reduce the reliability and safety of materials.It is of great significance to carry out real-time health monitoring and damage localization research on composite materials.Acoustic emission(AE)technology can effectively detect microscopic damage of composite materials.In comparison,the fiber-grating based acoustic emission monitoring system is not affected by electromagnetic interference and can measure multiple physical quantities at multiple points at the same time,but further research is still needed to achieve high precision damage localization.Therefore,a four-channel temperature adaptive fiber Bragg grating(FBG)acoustic emission monitoring system is built,which can quickly track,timely feedback and real-time monitor the central wavelength change of FBG,improve the positioning accuracy,and monitor the damage localization of carbon fiber reinforced composites in variable temperature range,and the results show that the average damage positioning error of the system is only 12％.
万方数据
维普
