Interfacial properties and damage sensing for the carbon fiber/epoxy-amine terminated (AT)-polyetherimide(PEI) composite were performed using microdroplet test and electrical resistance measurements. As AT-PEI contend increased, the fracture toughness of epoxy-AT-PEI matrix increased, and interfacial shear strength (IFSS) increased due to the improved fracture toughness by energy absorption mechanisms of AT-PEI phase. the microdroplet in the carbon fiber/neat epoxy composite showed brittle microfailure mode. At 15 phr AT-PEI content, ductile microfailure mode appeared because of improved fracture toughness. After curing, the change in electrical resistance (ΔR) with increasing AT-PEI content increased gradually because of thermal shrinkage. Under cyclic stress, in the neat epoxy case the reaching time until same stress was faster and their slope was higher than those of 15 phr AT-PEI. The result obtained from electrical resistance measurements under curing process and reversible stress/strain was correspondence well with matrix toughness properties.

Interfacial properties and damage sensing for the carbon fiber/epoxy-amine terminated (AT)-polyetherimide(PEI) composite were performed using microdroplet test and electrical resistance measurements. As AT-PEI contend increased, the fracture toughness of epoxy-AT-PEI matrix increased, and interfacial shear strength (IFSS) increased due to the improved fracture toughness by energy absorption mechanisms of AT-PEI phase. the microdroplet in the carbon fiber/neat epoxy composite showed brittle microfailure mode. At 15 phr AT-PEI content, ductile microfailure mode appeared because of improved fracture toughness. After curing, the change in electrical resistance (ΔR) with increasing AT-PEI content increased gradually because of thermal shrinkage. Under cyclic stress, in the neat epoxy case the reaching time until same stress was faster and their slope was higher than those of 15 phr AT-PEI. The result obtained from electrical resistance measurements under curing process and reversible stress/strain was correspondence well with matrix toughness properties.

Keywords: Damage sensing, Electrical resistivity, Interfacial shear strength (IFSS), Fracture toughness, Residual stress

Keywords: 손상감지능, 전기저항도, 계면전단강도, 파괴인성, 잔류응력