Abstract:

For the purpose of real-time detection on the damage of 3-D braided composite materials, this paper proposes the new way of the carbon nanowires sensor enbedded into 3-D braided composite material by three-dimensional five-derection four-step method. Carbon nanowire sensor bas similar property with carbon fibers, thus, it has little impact on the carrying performance after carbon nanowires are embedded into the 3-D braided composite material part. The paper analyzes the correlation of the rate of change of its resistance and strain on parts of 3-D braided composite materials b three point bending experiment. The experiment result shows that the resistivity of embedded carbon nanowires has exponential fitting relationship with the strain of 3-D braided composite material parts under stress. Hence, the damage of 3-D braided composites can be monitored by the corelation function of the resistance change rate and the stress or strain.

Key words: carbon nanowires, composite, three-dimensional five direction four-step method, three point bending, strain sensing