The design of composite submarine pressure hull is optimize the Stress and Failure index into consideration using ANSYS Software and Tsai-Wu Failure theory. The FEA value is compared with theoretical results. The composite of EPOXY resin and E-GLASS fiber is used to optimize the failure criteria by using ANSYS software. The failure index o the isentropic and orthotropic material should be less than 1 as per the Tsai-Wu criteria. The pressure hull is used to many structural applications such that Pressure Vessels, Aircrafts and Nuclear Submarines. The Failure index value is vary from applied load.

Keywords : Composite cylinders; Optimization; Failure Index; Epoxy; E-Glass