Residual Strength and Fatigue Investigation on Aramid-Carbon/Epoxy Laminates

摘要

Hybrid type laminates consisting of a carbon/epoxy core and face sheets of aramid fabric were investigated to determine the effect of aramid fabric on toughness. Residual strength tests were performed on laminate specimens with a central hole. The effect of temperature on residual strength was studied (measurements at room temperature and 338 K). Constant amplitude fatigue tests were carried out to investigate the effect of fatigue loading at low stresses on residual strength and to determine S-N curves for notched and unnotched material. The results demonstrate that aramid face sheets do not improve the residual strength or carbon/epoxy laminates. No consistent changes in residual strength were observed at 338 K. Fatigue loading can improve the residual strength of notched specimens.