Abstract
Recently, the automobile industry has demanded weight reduction, so research on materials is being actively conducted. Among this research, carbon fiber-reinforced composite materials are being studied a lot in the automobile industry due to their excellent mechanical properties, chemical resistance, and heat resistance. However, carbon fiber-reinforced composite materials have disadvantages, in that they are not free from color selection, and have weak interfacial bonding strength. In this study, a colored epoxy resin was prepared by mixing epoxy—which is a thermosetting resin according to the pigment concentration (0.1, 0.3, 0.5, 1.0 wt%)—and curing shrinkage. Thermal expansion characteristics were analyzed and the concentration of 0.5 wt% pigment showed the lowest shrinkage and thermal expansion characteristics. In addition, to measure the interfacial shear strength (IFSS) of the carbon fiber and the colored epoxy resin, the IFSS was obtained by performing a microdroplet debonding test, and the strength of the pigment concentration of 0.5 wt% was reduced to a relatively low level. Through these experiments, it was determined that an epoxy resin in which 0.5 wt% pigment is mixed is the optimal condition. Finally, using the composite material modeling software (Digimat 2020.0), the representative volume element (RVE) of the meso-scale was set, and interfacial properties of carbon fibers and colored epoxy resins were analyzed by interworking with general-purpose finite element analysis software (Abaqus CAE).
Highlights
Carbon fiber-reinforced plastic (CFRP) has high specific strength, specific modulus and chemical resistance, has a lower density than metal materials, and has been used in aerospace and defense industries since the 1960s due to its high mechanical properties and light weight
Due to these characteristics it has high mechanical properties, chemical resistance, and heat resistance, and active research is being conducted in various applications
After curing the colored epoxy resin by dropping it on the carbon fiber, a microdroplet debonding test was performed to measure the interfacial shear strength (IFSS) of the carbon fiber and the colored epoxy resin
Summary
Carbon fiber-reinforced plastic (CFRP) has high specific strength, specific modulus and chemical resistance, has a lower density than metal materials, and has been used in aerospace and defense industries since the 1960s due to its high mechanical properties and light weight. Epoxy resin has an irreversible property of changing its curing behavior from a viscous liquid state to a low molecular weight rubber state to a solid glass state depending on temperature [6–10] Due to these characteristics it has high mechanical properties, chemical resistance, and heat resistance, and active research is being conducted in various applications. After curing the colored epoxy resin by dropping it on the carbon fiber, a microdroplet debonding test was performed to measure the IFSS of the carbon fiber and the colored epoxy resin This simulation was performed by interlocking analysis with composite material modeling software (Digimat 2020.0) [17–19] and general-purpose finite element analysis software (Abaqus CAE) [11,17] to analyze the experimental results and analyze the interface characteristics between the resin and the fiber
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