Tensile strength at each accumulative probability of strength (Pf) was obtained for 28mass% carbon fibers (CF) reinforced thermoplastic polypropylene (PP) with and without sizing epoxy film on the fibers prior to making composites (CFRTP) of three cross CF cloth sheets and four PP matts, layer by layer. The sizing film covered on CF apparently improved the tensile strength. Namely, an effect of the sizing epoxy film covered on carbon fiber apparently strengthened the CFRTP. It could be explained by the increasing resistance to pull-out fibers with large friction force because the adhesive sizing film probably increased the interface contact atom pairs of CF and PP. The PP was distorted and twisted polymers more than that of straight polymers of polyethylene, and was probably generated the spontaneous nano-scale rough interface against CF.

The homogeneous and quick treatment of 100 keV class electron beam irradiation (EBI) improved the resistance to impact fatigue indicated by the critical collision number (N c) of impact fracture of PZT (Pb(Nb 2/3 Ni 1/3)O 3-Pb(Zr 1/3 Ti 2/3)O 3) ceramics, although an additional dose decayed them. An optimal dose of 0.086 MGy-EBI apparently improved the N c and E C i of PZT. It could be explained by shortening the lattice constant after the collision for the PZT irradiated with the optimal dose.