1993 Volume 42 Issue 475 Pages 355-358
Elastic moduli of glass fiber that is used for reinforcement of FRP are measured in the temperature range from 20 to 300°C.
In this experiment, three kinds of glass fiber samples were prepared; E-glass, C-glass and T-glass. Load was placed on a specimen in a transparent furnace controlled at predetermined temperatures. The elongation of specimen was read by a reading microscope and the diameter of specimen was measured by a micrometer. The elastic modulus of glass fiber was calculated by the gradient of load-elongation diagram, the diameter of glass fiber and the distance between the marks on the glass fiber specimen.
The results obtained are as follows;
(1) The elastic modulus of glass fiber obtained was 60-80GPa at room temperature, and depended on composition and diameter of glass fibers.
(2) The elastic modulus of E-glass decreased with increasing temperature, while that of C-glass did not change very much with temperature and that of T-glass increased with temperature.
(3) In any case, the elastic moduli of small size fibers were larger than those of large size fibers.