大型風車向けブレード用複合材の強度特性評価

抄録

The strength of glass fiber reinforced plastics (GFRP) was evaluated based on Puck's rule for validating as wind turbine blade materials. Glass fiber reinforced unsaturated polyester (GRU) resins and epoxy (GRE) resins were subjected to static strength tests. The strength dependence of GRU on the fiber direction was also evaluated according to the Tsai-Wu failure criterion. GRU showed higher values of tensile fiber failure (FF) and inter fiber failure (IFF) criteria of Mode B than GRE. On the other hand, GRU indicated lower compressive FF and IFF criteria of Mode A and Mode C than GRE. Furthermore, the tensile strength dependence of the GRU on the fiber direction followed Tsai-Wu failure rule. When the fiber direction was inclined by 4° from the loading direction, the strength of GRU decreased 50 % from the fiber directional value. We could define the manufacturing tolerance of the fiber direction quantitatively by the Tsai-Wu failure criterion for blade materials.