lca of lightweight vehicles by using cfrp for mass ... - Takahashi

2. METI, Global warming program, “Report of Research and development on carbon fiberreinforced plastic for lightening automobiles”, 2004, pp. 205-206.3. Atsushi Funazaki, Katsunori Taneda, “A study of Inventories for Automobile LCA (1) -Petroleum fuel Models and Inventories of Petroleum fuel Production -”, JARI Research Journal,Vol.21, No.12, November, 1999, pp. 58-65Specific strength (σf/ρ)50454035302520151050Steel (1470MPa)Steel (780MPa)Steel (440MPa)Steel (270MPa)CFRTS (For airplanes)CFRTS (Rapid Molding)TitaniumGFRPAlminumVf=0.10.00 0.05 0.10 0.15 0.20 0.25Specific rigidity ( 3 E/ρ)MagnesiumFig. 1 Specific rigidity and specific strength ofseveral materialsFuel efficiency (L/km)0.20.160.120.080.040y = 6E-05x + 0.0174R 2 = 0.83870 500 1000 1500 2000 2500Vehicle weight (kg)Vf=0.5CFRTPTable 1 Energy intensity of materialsEnergy intensity [MJ/kg]Steel 32CF 286CFRPP *1 155CFREP *2 234*1: Vf = 30%, *2: Vf = 60%Table 2 Parts weight before and after lightenedWeight Weight WeightPartsbefore after reductionlightened lightened ratio[kg] [kg] [%]Body 475.04 202.99 57.3Interior &Exterior223.49 183.52 17.9Chassis 278.49 152.69 45.2Engine System 194.39 136.08 30.0Driving &steering system48.62 46.20 5.0Electric system 117.69 117.69 0.0Liquid, Others 42.26 42.26 0.0Total 1380.00 881.44 36.1Fig. 2 Relation between vehicle weight and realfuel efficiencyEnergy consumption (10 4 MJ)5045403530252015105037.02.18.7Steel vehicleUseVehicle productionMaterial production25.91.712.9CFRP vehicleFig. 3 Energy consumption during the life cycle