Abstract
The tube-tubesheet joint by roller expansion process is widely used for the manufacturing of heat exchangers. The industry experiences quality issues with the joint, due to over or under expansion of the tubes. The paper focuses on the numerical modelling of the rolling process, and verification by experiments. The numerical model is simulated using LS-DYNA, where the motion of the rollers is included to simulate the step-wise plastic deformation of the tube. The model is built in 3D, with plane strain assumption for a section of the tube-tubesheet. The tubesheet structure is included in the model to obtain a realistic and appropriate stiffness behaviour. The experiments are investigated using optical measuring equipment, where the Micro Vickers Hardness and the grain structure of the tube in the plastic deformed zone are evaluated. The paper investigates the validity of modelling the tube-tubesheet expansion process with inclusion of the rollers.The input deck for LS-DYNA is available on request, from Karl Brian Nielsen.
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 callDisclaimer: 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.
