抄録
Low cycle flexural fatigue behavior of unidirectionally laminated FRP reinforced with carbon fibers and aramid fibers were studied. A fatigue experimental investigation has been carried out on carbon/epoxy (type C) and, aramid/epoxy (type A) and C/A hybrid (type C-A-C, A-CA) laminates. As the results, it was found that, 1) Type C-A-C exhibites a deterioration of flexural fatigue strength. This was caused by the AFRP layers degrading flexural stiffness of the beam. 2) Type A-C-A shows much improvement of flexural fatigue strength. The flexural strength of type A-C-A is twice of the flexural strength of type A and greater than the strength of type C over 10 cycles of fatigue. This improvement was caused by the CFRP inside layers which increase the flexural stiffness and supress the decrease of the stiffness of the AFRP layers in the tensile side of the beam.
