抄録
This paper deals with the creep properties of CF/GF hybrid laminates. Hybrid laminates used in this experiment were symmetrical hybrid FRP laminates of 7 selected thickness ratio including CFRP and GFRP. The reinforcement used in CFRP was plain woven carbon-fibrous cloth.
The conditions of the 3 points bending creep tests were 1 level of maximum bending stress at 5kgf/mm2, 4 levels of environmental temperature at 20°C, 50°C, 80°C and 110°C, 4 levels of off-axis angles at 0°, 15°, 30° and 45°, and 7 levels of thickness ratio [thickness of (sureface=CFRP)/Thickness of (total=CFRP+GFRP)] at 1, 0.5, 0.43, 0.33, 0.2, 0.09 and 0, respectively.
The measured creep relaxation properties of these laminates were discussed on the basis of calculating formula of stiffness of sandwich panel and off-axis analysis of bi-directional reinforced theory. From the discussion, it is concluded that some of the selected hybrid laminates can be used as the advanced structural FRP materials for machine tools.
