| 초록 |
Modified epoxy resin can be cured by ultraviolet (UV) radiation at room temperature. Major advantages of UV curing process are fast speed cure process, low energy consumption due to operating at low or room temperature, and environmentally-friendly because of solvent free. In this study, interfacial evaluation and damage sensing of single carbon fiber/epoxy composites were investigated using electro-micromechanical test and acoustic emission (AE). Interfacial shear strength (IFSS) was correlated with their mechanical properties and the degree of cure. Optimum UV curing time was established by measuring mechanical properties and IFSS, IFSS of carbon fiber/epoxy composites increased gradually with elapsing UV curing time, and then they were saturated. The number of AE signal and amplitude for fiber fracture of carbon fiber/epoxy composites increased with UV curing time. For UV curing time at 20 minute, the maximum stress until same strain and apparent modulus were the highest under cyclic loading test. Acknowledgment: This work was financially supported from CAMP of the 21st C Frontier R&D program by Ministry of Science and Technology (MST), through the Engineering Research Institute (ERI), GNU. |
