Evaluation for Open Hole Tensile Fatigue Strength of Interlaminar Toughened CFRP LaminatesUsing Benzoxazine Resin as Matrix

Abstract

This paper is concerned with the effect of interlaminar toughening on the open hole tensile (OHT) static and fatigue strengths of quasi-isotropic CFRP laminates using benzoxazine resin. OHT static and fatigue tests were carried out for the interlaminar toughened (BXZ_ILT) and un-toughened (BXZ) CFRP laminates. As results, the OHT static strength for BXZ_ ILT is almost the same as that for BXZ. On the other hand, OHT fatigue strengths for BXZ_ILT are higher than those for BXZ. It can be presumed from the observation of the damages during fatigue loadings that the improvement of fatigue strength for BXZ_ILT is caused by the suppress of delamination in the side surfaces as well as the hole edge of specimen.