| 초록 |
Carbon nanotube (CNT) and nanofiber (CNF) reinforced polymeric matrix composites have high stiffness, strength and excellent electrical conductivity at relatively low concentrations. Nondestructive damage sensing and reinforcing effect of carbon nanocomposites were investigated using electro-micromechanical test and acoustic emission (AE). The sensitivity for fiber damage such as fiber fracture and fiber tension was the highest for CNT/epoxy composites, and for carbon black (CB) case they were the lowest. Sensitivity for fiber damage in CNT or CNF/epoxy composites was almost same in low content, whereas in high content sensitivity of CNT/epoxy composites was higher due to their high aspect ratio. Apparent modulus indicating the reinforcing effect of CNT/epoxy composites was the highest. In this work, new information on fiber damage and matrix deformation of carbon nanocomposites could be obtained from the electrical resistance measurement as a feasibly new concept for the nondestructive evaluation. Acknowledgement: This work was financially supported from CNMT of the 21st C Frontier R&D program by Ministry of Science and Technology (MST) through the Engineering Research Institute (ERI), GNU. |
