Analysis of the tensile moduli affected by microstructures among seven types of carbon fibers

A two-phase micromechanical model composed of crystallites and amorphous components can be employed to address the relationship between the microstructure and the tensile modulus of carbon fibers. It turns out that the tensile modulus increases with the increase of three factors: the aspect ratio of crystallites, volume fraction of crystallites and degree orientation of crystallites. Subsequently, seven types of carbon fibers are compared, and their differences of the tensile moduli affected by the three factors are calculated. The results show that the differences of the tensile moduli affected by the factors of microstructures between different types of carbon fibers can be discussed using the two-phase micromechanical model.