W-Al系短繊維強化合金における繊維の相互作用―包囲型繊維分布の場合―

抄録

The fiber/fiber interaction in short fiber reinforced composite alloys was studied by the moiré strain analysis. Models were prepared from the Al matrix and one short W fiber which was flanked by continuous W fibers. And these lateral fiber spacings were 18 d_f, 9 d_f and 6 d_f (d_f: fiber dia., d_f=0.5 mm). Uniaxial loading parallel to the fiber was considered.
The results obtained are as follows:
(1) Strain concentration in the matrix decreased with reducing lateral fiber spacing and the strain concentration area in the matrix became narrower with decreasing lateral fiber spacing. For example, the lateral effect of strain concentration was about 15 d_f when the lateral fiber spacing was 6 d_f and the average strain of composite alloy model was 5.4×10⁻³.
(2) The maximum value of shear strain in the matrix along the short fiber-matrix interface decayed down as lateral fiber spacing decreased.
(3) The critical aspect ratio diminished from 30 to 20 when the lateral fiber spacings decreased from 18 to 6 d_f.
(4) In the vicinity of short fiber ends, the strain concentration factor of the nearest fibers was about 1.4 and that of the second nearest fibers was about 1.2 when e_c was 5.4×10⁻³, the lateral fiber spacings being 6 d_f.