Abstract
This paper is to follow the previous part 5 in which experimental results and some considerations on fiber reinforced inorganic composite materials are reported. According to the experimental results, we propose a model explaning the tensile fracture mechanism of fiber reinforced inorganic composite materials. This model is that initially both the matrix and the fibers carry tensile stress and when the tensile stress of the matrix becomes equal to the tensile strength of the matrix, a cradk initiates in the matrix. After the crack appeares in the matrix, only the fibers carry the tencile stress and the ultimate fracture occurs by pulling out or breaking of the fibers. On the basis of this model, the cracking strength of fiber reinforced inorganic composite materials is estimated by σ_<cra> and the ultimate tensile strength is represented by the larger one of σ_<cra> and σ_<f0-> Where σ_<cra> is the tencile stress of fiber reinforced inorganic composite materials when the tensile stress of the matrix is equal to the tensile strength of the matrix, and σ_<f0> is the maximum tensile stress which the fibers can carry by themselves. By the way in the study of the theoretical tensile strength of fiber reinforced composite materials, the statistical calculation of the fiber dispersion often becomes a matter. We put the name of "Reinforcing Factor k by Fiber dispersion" on this problem and take some considerations, that we analyse and lead the value of k in several cases of the fiber dispersion.
