Three-point bending fatigue behavior of 3D angle-interlock woven composite

This study reports the three-point bending fatigue behavior of three-dimensional angle-interlock glass/polyester woven composite (3DAWC). The S-N curve was obtained under the different bending stress levels. The bending stress vs. bending deflection curves were recorded to show the stiffness degradation and bending deformation of the 3DAWC during the fatigue test. The failure modes of the 3DAWC under the different fatigue loading conditions were photographed and compared with those in quasi-static bending tests. It was found that the integrated construction structure of the 3D angle-interlock woven fabric can resist the delamination of the 3DAWC under high-cycle fatigue loading. The cracks propagation and breakages of the warp yarns that run through the thickness direction of the 3DAWC dominate the fatigue failure. The resin cracks and resin-yarn interface debonding are the secondary factors for determining the fatigue behavior.