基于碳纳米管薄膜的复合材料在线损伤监测

Considering that fiber-reinforced polymeric composites would be damaged due to impact, compression, fatigue and other factors during service, a composite with on-line damage self-sensing capabilities was developed based on carbon nanotube films, which possess desirable mechanical and electrical properties. Using the conductive network formed by carbon nanotubes, the damage of composites will destroy the conductive path and greatly increase the resistance of carbon nanotube films. The on-line self-sensing of composite damages was realized by measuring the boundary voltage of the composite, and then solving/imaging the conductivity distribution within the composite through the Electrical Resistance Tomography. Both damages of through-hole and model-I interlaminar fracture were investigated, and the results show that for these two damage modes, the obtained composite can realize on-line damage localization as well as damage display through EIT image reconstruction. For the through hole damage mode, the damage with an area accounting for 0.038% can be monitored online. In addition, the accuracy of through-hole localization can reach millimeter level.