Abstract
A creep constitutive model, based upon the θ-projection concept, is derived using constant-stress creep curves obtained from miniature creep specimens cut from the walls of Alloy 800H tubing. Initial verification of the model predictions under changing uniaxial stress conditions is made by comparison with a series of constant-load creep results. Two multiaxial constitutive models have been developed based on the θ description of uniaxial behaviour, the first based on a von Mises function of equivalent stress and the second based on the maximum principal stress criterion. These models are used to predict the creep deformation and rupture behaviour of tubular specimens under combined internal pressure and axial load. It is shown that both the multiaxial creep deformation and rupture behaviour of Alloy 800H at 900°C are well predicted by the model based on the maximum principal stress criterion.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: International Journal of Pressure Vessels and Piping
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
