Kemp, Brian Lee2019-07-032019-07-031985http://hdl.handle.net/10919/91127A change in laminate thickness due to terminating internal plies acts as a stress riser for both intralamina and interlaminar stresses. This laminate configuration is referred to as a ply drop. The linear elastic, three-dimensional stress distributions in the vicinity of a ply drop are determined for a graphite-epoxy laminate subject to axial tension and compression by a finite element analysis. It is shown that the interlaminar stresses have a maximum magnitude at the ply drop-off, and decrease proceeding away from the drop-off. Two modes of failure initiation are analyzed. In the pure resin regions surrounding the dropped plies, the maximum stress criterion is assumed to govern failure. The Tsai-Wu criterion is used for intralamina failure prediction. The influence of two laminate lay-ups and a variety of ply drop geometries on the response and failure are presented.v, 70 leavesapplication/pdfen-USIn CopyrightLD5655.V855 1985.K456Laminated materials -- AnalysisLaminated materials -- TestingFinite element methodLaminated materials -- FatigueThesis