Flexural behavior of stepped graphite/epoxy laminates

Abstract Cross‐ply tapered/stepped laminates with taper angles of 1 and 2° between the top and bottom surfaces were fabricated using T300/943 graphite/epoxy by compression molding. Ply terminations were done internally within the laminate and externally on the surface of the laminate at various cross‐sections in order to obtain the taper. Equivalent cross‐ply specimens with internal and external ply terminations, respectively, were tested in three point bending. The bending stiffness of the equivalent corss‐ply are nearly equal, while the failure modes are significantly different. The tapered laminates with internal ply terminations failed due to a series of delaminations originating at the step corners of the 0° plies. Macroscopically, the specimens with internal ply term nations failed by tensile fracture of the outer plies at relatively higher loads.