Strain Monitoring Of High Silicon Oxygen Fiber Composites By Carbon Nanosensors

Fiber reinforced polymer composites are a common alternative to traditional metal alloys.However,the damage patterns that occur inside them require strategies to monitor these structures.The carbon nanotube film sensor has the characteristics of self-supporting structure,excellent electrical properties and mesoporous materials,and can be integrally formed with the composite material.It is a small volume that does not affect the structural integrity of the original composite material.New sensor for material damage.In this paper,carbon nanosensors are fabricated and used to monitor the strain and damage of composites subjected to tensile and cyclic fatigue loads,and the monitoring objectives are achieved by measuring the electrical resistance of the carbon nanosensors integrally formed with the composite.The test results show that the Barker paper sensor has high strain sensitivity in the static tensile test,and the strain sensing coefficient can reach about 64.77.In addition,in the fatigue test,although the temperature decreases the resistance of the Barker paper sensor,the resistance change rate It still changes linearly with loading and unloading.These studies show that the Barker paper sensor has very good stability and strain monitoring synchronization,which can meet the needs of composite structure health monitoring.Based on this,the carbon nanosensor is used to monitor the inner wall and outer wall of the rocket engine nozzle under certain temperature changing conditions.The strain changes,the test results show that carbon nanosensors can be used to replace other means of monitoring rocket engine nozzles,and the measurement accuracy is high and accurate timeliness.