抄録
This paper deals with SMC (Sheet Molding Compound) laminate which is one of the useful fiber reinforced plastics manufactured by press-molding. In order to examine the influence of quantity of the component on the mechanical properties of SMC, SMC were molded in the square shaped plates and tensile strength at various points in the plate was measured. The glass-fiber contents of SMC were 30, 55 and 65wt.%. The main results obtained in this work are summarized as follows;
(1) The complicated flow of the dispersed materials in SMC occured during molding due to localized phenomena at the edge of squre plate. The tensile strength of SMC plate except that at the edge part increased with increasing fiber content but the increase of strength stopped at the fiber content over 55wt.%. The tensile strength at 55wt.% was as high as 20.9kg/mm2.
The variation of the tensile strength of SMC plate except that at the edge part decreased with increasing fiber content. The minimum coefficient of variation was 7.4%. It seems to suggest that the SMC with high fiber content is very usefull.
(2) The variation of the tensile strength of SMC plate including that at the edge part has the minimum value at the fiber content of 55wt.% and the filler content of 10wt.%. This seems to be influenced by the effect of filler which prevents the fiber alignment at the edge part and makes the fiber orientation distribution not uniform.
