Recently, carbon fiber-reinforced polymer materials have been used in many fields, including the automotive and aerospace sectors. Furthermore, the eco-friendly carbon-fiber-reinforced polymer composites as engineering plastics have been developed over the past decade. The strength evaluation of the...
Recently, carbon fiber-reinforced polymer materials have been used in many fields, including the automotive and aerospace sectors. Furthermore, the eco-friendly carbon-fiber-reinforced polymer composites as engineering plastics have been developed over the past decade. The strength evaluation of the material in order to ensure the reliability and stability of the composite material is to be as an important emerging issue. In this paper with the carbonfiber contents(0%, 10%, 15%, 20%), injection mold temperature(60℃, 70℃, 80℃), dumbbell- shaped specimens according to the presence or absence of weld line was fabricated. The results obtained by MAPS 3D CAE denoted : Charge which occur during the injection molding, the location of the weld line, arrays fibers, shrinkage and bending, cooling, packing that were analyzed to study the influence of mold temperature on the mechanical strength of carbon fiber content. We obtained results as follows 1. Charge, weld line, fiber array by MAPS 3D CAE using injection molding analysis program was interpreted. The comparison results were matched with specimen’s products. In addition, to gate location, shape and size in order to prevent shrinkage and warpage of the specimen were applied to the actual injection mold temperature change according to product characteristics based on the injection pressure, coolant hole location number, interpretation of the pressure inside the mold and the results of molding temperature packing analysis were able to make the best of the specimens. 2. Depending on the temperature in the base metals specimen, the contents of the carbon fiber 0% denote the same yield point of 51MPa, 52MPa, 51MPa on the temperature of 60℃, 70℃, 80 ℃. However, in case of yield strain depending was seen a strain of 170%, 120% in 60℃, 80℃ and a strain of 200% in 70℃. That was demonstrated more 80% than the mold temperature of 80℃ when compared with the lowest yield strain 80%. It was seen the unique growing characteristics of the thermoplastic resin with deformation distributed of loading the temperature of mold of 70℃ 3. The polycarbonate in the base metal specimen denote the yield strength of almost the same 49.3MPa, 49.3MPa, 49.1MPa in the temperature of 60℃, 70℃, 80℃. It was seen 18% of yield strength in the mold temperature of 60℃, 70℃ and 14% in 80℃. It decreased until maximum 180% according to the weld line. The weld line with carbon fiber of 0% is identified decrease of the yield strain. But the degradation more than 50% not occurred as Hub Bauer, Bell insisted. 4. According to the content of the base metals specimen, carbon 0% of specimens have the yield strength of 52MPa and the yield strength of the highest 110MPa, 113MPa at mold temperature of 60°C, 70°C in 20% of specimens, and could be obtained strength improvement of 217% by adding 20% carbon fiber compared with 10% carbon fiber content. However, more than 10% carbon fiber, the influence of the carbon fiber in polycarbonate does not significantly increase. It shows reduction more than 50% in strength compared with welded specimens and no weld lines it was seen the yield strength of the 49.3MPa, 51MPa, 50.3MPa, 31MPa with the carbon content of 0%, 10%, 15% and was seen a low yield strain of 18%∼1.8% 5. In carbon 20% fiber base material fracture, it was seen a high strength and matrix fracture, fiber pull-out, fiber break of forward turning and tetragonality(horizontal direction) from the influence of the mold temperature 70°C. In fracture of carbon fiber 20% at 80°C of mold temperature, it was seen the lowest deformation results from shrinkage of carbon fiber and polycarbonate. It was seen a carbon fiber from the direction perpendicular to the anisotropic carbon fiber resin. It could be seen matrix fracture, do separation, fiber break, and delamination in picture. Weld line strength degradation generates from the unsafe junction carbon fiber and polycarbonate. It was also consistent with the weld strength theory of Kim and Sub' that was a formation of unsafe junction from two fluidity composition plan and a formation of half molecule coagulated from all fluidity plan. 6. Using welding materials laminated polarizing microscope, the X (horizontal) and Y (vertical), Z (top), the observed Z (top) in the fleet to meet the two resin flow going on the crater-like shape of the fiber orientation distribution was seen. In addition, mixing station, depending on the distance from the leading edge of the mixing zone was formed. Y (vertical) cross-section of the carbon fiber cross-section was observed only welded X (horizontal) direction in the Y (vertical) carbon fiber of clashes in tanglement look. This is the cause of the reduction in strength. X (horizontal) and Y (vertical) of the matrix was showing the direction that is parallel to the fiber resin. Therefore, it could be seen the highest yield strength at the same direction of the resin. and the looks of the welding materials laminated by polarized light microscopy analysis and the looks of MAPS 3D CAE simulation was coincided with almost identical figure. 7. The results of comparing the strength of the specimen in accordance with the notch of the substrate carbon fiber carbon contents of 0%. 10%, 15% and 20% is seen the strength of 42.1MPa, 59.3MPa, 65.4MPa and 31.8MPa respectively. The carbon content of 10%, 15% increase in strength were increased, the intensity dropped 20% due to a reduction of the matrix. Welding material of carbon fiber carbon content of 0%, 10%, 15%, and 20% were seen with 42MPa, 44.1MPa, 43.6MPa, and 31MPa respectively.
Recently, carbon fiber-reinforced polymer materials have been used in many fields, including the automotive and aerospace sectors. Furthermore, the eco-friendly carbon-fiber-reinforced polymer composites as engineering plastics have been developed over the past decade. The strength evaluation of the material in order to ensure the reliability and stability of the composite material is to be as an important emerging issue. In this paper with the carbonfiber contents(0%, 10%, 15%, 20%), injection mold temperature(60℃, 70℃, 80℃), dumbbell- shaped specimens according to the presence or absence of weld line was fabricated. The results obtained by MAPS 3D CAE denoted : Charge which occur during the injection molding, the location of the weld line, arrays fibers, shrinkage and bending, cooling, packing that were analyzed to study the influence of mold temperature on the mechanical strength of carbon fiber content. We obtained results as follows 1. Charge, weld line, fiber array by MAPS 3D CAE using injection molding analysis program was interpreted. The comparison results were matched with specimen’s products. In addition, to gate location, shape and size in order to prevent shrinkage and warpage of the specimen were applied to the actual injection mold temperature change according to product characteristics based on the injection pressure, coolant hole location number, interpretation of the pressure inside the mold and the results of molding temperature packing analysis were able to make the best of the specimens. 2. Depending on the temperature in the base metals specimen, the contents of the carbon fiber 0% denote the same yield point of 51MPa, 52MPa, 51MPa on the temperature of 60℃, 70℃, 80 ℃. However, in case of yield strain depending was seen a strain of 170%, 120% in 60℃, 80℃ and a strain of 200% in 70℃. That was demonstrated more 80% than the mold temperature of 80℃ when compared with the lowest yield strain 80%. It was seen the unique growing characteristics of the thermoplastic resin with deformation distributed of loading the temperature of mold of 70℃ 3. The polycarbonate in the base metal specimen denote the yield strength of almost the same 49.3MPa, 49.3MPa, 49.1MPa in the temperature of 60℃, 70℃, 80℃. It was seen 18% of yield strength in the mold temperature of 60℃, 70℃ and 14% in 80℃. It decreased until maximum 180% according to the weld line. The weld line with carbon fiber of 0% is identified decrease of the yield strain. But the degradation more than 50% not occurred as Hub Bauer, Bell insisted. 4. According to the content of the base metals specimen, carbon 0% of specimens have the yield strength of 52MPa and the yield strength of the highest 110MPa, 113MPa at mold temperature of 60°C, 70°C in 20% of specimens, and could be obtained strength improvement of 217% by adding 20% carbon fiber compared with 10% carbon fiber content. However, more than 10% carbon fiber, the influence of the carbon fiber in polycarbonate does not significantly increase. It shows reduction more than 50% in strength compared with welded specimens and no weld lines it was seen the yield strength of the 49.3MPa, 51MPa, 50.3MPa, 31MPa with the carbon content of 0%, 10%, 15% and was seen a low yield strain of 18%∼1.8% 5. In carbon 20% fiber base material fracture, it was seen a high strength and matrix fracture, fiber pull-out, fiber break of forward turning and tetragonality(horizontal direction) from the influence of the mold temperature 70°C. In fracture of carbon fiber 20% at 80°C of mold temperature, it was seen the lowest deformation results from shrinkage of carbon fiber and polycarbonate. It was seen a carbon fiber from the direction perpendicular to the anisotropic carbon fiber resin. It could be seen matrix fracture, do separation, fiber break, and delamination in picture. Weld line strength degradation generates from the unsafe junction carbon fiber and polycarbonate. It was also consistent with the weld strength theory of Kim and Sub' that was a formation of unsafe junction from two fluidity composition plan and a formation of half molecule coagulated from all fluidity plan. 6. Using welding materials laminated polarizing microscope, the X (horizontal) and Y (vertical), Z (top), the observed Z (top) in the fleet to meet the two resin flow going on the crater-like shape of the fiber orientation distribution was seen. In addition, mixing station, depending on the distance from the leading edge of the mixing zone was formed. Y (vertical) cross-section of the carbon fiber cross-section was observed only welded X (horizontal) direction in the Y (vertical) carbon fiber of clashes in tanglement look. This is the cause of the reduction in strength. X (horizontal) and Y (vertical) of the matrix was showing the direction that is parallel to the fiber resin. Therefore, it could be seen the highest yield strength at the same direction of the resin. and the looks of the welding materials laminated by polarized light microscopy analysis and the looks of MAPS 3D CAE simulation was coincided with almost identical figure. 7. The results of comparing the strength of the specimen in accordance with the notch of the substrate carbon fiber carbon contents of 0%. 10%, 15% and 20% is seen the strength of 42.1MPa, 59.3MPa, 65.4MPa and 31.8MPa respectively. The carbon content of 10%, 15% increase in strength were increased, the intensity dropped 20% due to a reduction of the matrix. Welding material of carbon fiber carbon content of 0%, 10%, 15%, and 20% were seen with 42MPa, 44.1MPa, 43.6MPa, and 31MPa respectively.
주제어
#"polycarbonate carbon fiber tensile strength injection"
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