Abstract
Interstage annealing is often employed as a method to increase the forming limit of sheet metals. This paper describes the effect of interstage annealing on the surface roughening and the improvement of limit strain of aluminum sheets. A rigid-plastic finite element simulation of plane strain tension was firstly made to predict how the limit strain could be increased by the interstage annealing and how the surface roughening would develop with plastic strain after the interstage annealing. Uniaxial tension, plane strain tension and hole expansion tests were then carried out to confirm the result of simulation. The simulation and experimental results show that the interstage annealing contributes to the recovery of ductility, but on the contrary, the increase in plastic strain due to the annealing causes the development of the surface roughening which induces a localized necking. As a result of these two effects which oppose each other, the total strain achieved is limited even if the number of interstage annealing is increased.
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.
