The Fatigue Behavior and Delamination Properties in Fiber Reinforced Aramid Laminates

다국어 초록 (Multilingual Abstract)

The fuselage-wing intersection suffers from the cyclic bending moment of variable amplitude. Therefore, the influence of cyclic bending moment on the delamination and the fatigue crack propagation behavior in AFRP/ AI laminate of fuselage-wing was investigated in this study. The cyclic bending moment fatigue test in AFRP/ AI laminate was performed with five levels of bending moment. The shape and size of the delamination zone formed along the fatigue crack between aluminum sheet and aramid fiber-adhesive layer were measured by an ultrasonic C-scan. The relationships between da/dN and △K, between the cyclic bending moment and the delamination zone size, and between the fiber bridging behavior and the delamination zone were studied. As results, fiber failures were not observed in the delamination zone in this study; the fiber bridging modification factor increases and the fatigue crack growth rate decrease; and the shape of delamination zone is semi-elliptic with the contour decreasing non-linearly toward the crack tip.

목차 (Table of Contents)

• Abstract
  
• 1.Introduction
  
• 2.Experimental Procedure
  
• 3.Results and Discussion
  
• 4.Conclusions
  
• Acknowledgment
  
• References