メゾスケールシミュレーションによるCFRP強度評価の高度化

抄録

A methodology of accurate fracture estimation for carbon fiber reinforced plastic (CFRP) tank is presented in the framework of meso-scale mechanics, where carbon fiber bundle and resin are distinguished. Its validity is proven through an experiment employing cross shape specimen representing fiber bundle situation in CFRP layer of the tank. The specimen is manufactured by filament winding machine to form crimps of fiber bundles crossover by right angle. Its mesoscopic structure of fiber bundle and resin is precisely modeled for the finite element analysis. Highly non-linear material model of resin strength has been applied to predict breakage load and elongation of the specimen under biaxial tensile test. We have elucidated strain-rate dependency and tension-compression asymmetry in resin strength, and transverse strength of fiber bundle govern the fracture process of the specimen.