抄録
The open hole tension (OHT) and open hole compression (OHC) static and fatigue tests were conducted for the interlaminar toughened and un-toughened quasi-isotropic CFRP laminates using benzoxazine resin as the matrix. The influence of toughened interlayer on the OHT and OHC static and fatigue strengths of quasi-isotropic CFRP laminates was discussed. As results, the fatigue strength as well as the static strength by OHT loading is clearly larger than that by OHC loading. The strengthening by toughened interlayer is found in OHT loading, however this strengthening is not found in OHC loading. It was clarified by the observation of damages that the delamination onset and growth before the final fracture during fatigue loading are suppressed by the toughened interlayers in the case of OHT loading.
