Investigation of Fiber Angle Effects on Pressure-Temperature Capacity of Composite Pressure Vessels

A problem common to the pressure vessels designers is the evaluation of stresses due to the effect of both cyclic temperature and pressure. In this research, analysis of thick walled hybrid laminated composite pressure vessels subjected to both cyclic internal pressure and temperature, is investigated and effect of fiber angle is evaluated. At first, stress and strain equations by theoretical methods are evaluated and then the time dependent temperature distribution due to internal cyclic temperature within the wall of vessel using a numerical model basis of the finite difference technique is extracted. Pressure-temperature curves are presented for static pressure and steady state temperature using Hoffman theory for vessel with different laminate boron-epoxy and Graphite-epoxy composites. Generally, increasing fiber angle, the pressure capacity increased, but tolerable capacity of temperature decreases. So in fiber angle of zero, there are the maximum temperature and minimum pressure and in fiber angle 90, maximum pressure and minimum temperature will be tolerated