Numerical analysis of process induced stress field for composite filament wound vessel with metal liner

Based on characteristics of the whole manufacturing process enclosed the winding, cure and autofrettage processes for the composite filament wound vessel with metal liner, a methodology for the prediction of the induced process stress field has been developed. Firstly, a finite element approach combining the temperature parametric method with real fictitious elements scheme was proposed for simulating the winding tension process; secondly, in accordance with the cure kinetic and heat transfer theory, a corresponding finite element method was employed to calculate the distributions of temperature, cure degree and thermal stress fields during the cure process. Finally, a nonlinear finite element method on the basis of the classical plastic theory was introduced to analyze the distribution of residual stress field in the filament winding layers and metal liner after the autofrettage process. Numerical examples for a typical high pressure vessel were given for illustrating it. The results show that the vessel loading capacity can be improved by selecting the appropriate process parameters.