145 不織布挿入型ハイブリッド複合材料の静的FOD特性(OS5-2 異物衝突損傷)(OS5 材料の衝撃強度・損傷に関する最近の知見)  [in Japanese] 145 Static FOD Characteristics of Hybrid Composites with Non-Woven Tissue  [in Japanese]

Static FOD characteristics of hybrid composites with non-woven carbon tissue (NWCT) are investigated under contact loading condition with steel ball as the indentor. The hybrid composites are made by stacking NWCT- and CFRP-prepregs. Four kinds of composites are studied; i.e. CFRP composites ([0_5/90_5/0_5] and [0_3/90_3/0_3/90_3/0_3]) and hybrid composites ([0_5//90_5//0_5] and [0_3//90_3//0_3//90_3//0_3]). The symbol " // " means that the NWCT-prepreg is located at an interface between CFRP-layers. The NWCT-prepreg has short fibers, discretely distributed with in-plane random orientation. The objective of this investigation is to study the effect of the NWCT due to indentation loads in order to fundamentally understand the impact damage mechanics of hybrid composites. The fracture surfaces of the specimens observed by deplying process and microscope, and the fracture mechanism was discussed.