Numerical and experimental analyses of fracture carbon/epoxy composite pipe to steel cylinder with internal pressure

A mechanical joint has been used to joint metal cylinder to composite pipe made by filament winding so that by creation bump grooves, on the steel cylinder a guided path for manufacturing the composite pipe, during filament winding was made. Considering the modulus difference between composite carbon-epoxy pipe and steel cylinder, it’s predictable that the main parameter of joint strength under internal pressure is the mentioned modulus difference and fracture at joint edge. Finite element simulation and with hashin criteria for predicting failure initiation and progressive damage criteria that definet by UMAT subrotine achieving damage evolution has been used. The numerical solution results has been compared with experimental test results which are in good agreement with each other. Besides using microscopic imaging, the failure zone has been investigated. For numerical modeling the element with various orders has been used and numerical solution precision and speed, using this elements compared to experimental results has been investigated and continuum element with reduced integral 3D high order proposed.