An analytical coupled thermo-mechanical solution for friction-assisted tube straining method

This paper presents a coupled thermo-mechanical analytical solution for friction-assisted tube-straining method. Heat transfer, velocity field, and energy equations were derived for this process and were coupled into an incremental analysis. Derived equations were solved in many time intervals with mobile boundary conditions and heat input. Mechanical and thermal parts of the presented model were initially examined independently, then were coupled and compared with finite element method and experimental tests. Experimental tests were executed on commercially pure copper to monitor temperature field, extrusion force, and deformation behavior. Torsion angle of the processed tube was predicted by the computational model and was verified with finite element method and experimental test.