The static tensile test was conducted on composite materials embedded with buckypaper sensor to verify the ability of buckypaper sensors to monitor the crack propagation in composite materials. Taking glass fiber composites as an example

the resistance response of buckypaper sensors at various stages of crack generation was studied. The stage of crack generation is predicted by the change rate of resistance

so as to realize the monitoring of composite crack. The composite specimens were stretched to the crack initiation

propagation and fracture stages

respectively. Observe the change of the resistance change rate of the buckypaper sensor. The change rate of sensor resistance shows different trends with different stages of crack development. The cross-section image near the sensor is obtained by cross-section metallographic microscopic test. It is proved that the buckypaper sensors has the ability to monitor the crack propagation of composite materials.