Parameters affecting interlaminar stresses in tapered laminates under static loading conditions

Abstract Tapered laminates by internal ply drop‐offs have been studied. An extensive finite element program has been developed for microcomputers using displacement formulation. A 20 node, three dimensional element was used. Parameters which can influence the strength of the laminate were studied. These parameters include the location of the drop‐off in the thickness direction, the degree of resin filling inside the drop‐off, the shape of the drop‐off, the effect of width of laminate, and the orientation of the lamina where the drop‐off was made. Locations of failure based on maximum stress criterion were btained. Crack growth stimulation was also performed by consecutive removal of failed elements. Results show that crack growth is not continuous.