Stretch Bending of Aluminum Extrusions: Effect of Tensile Sequence
Publication: Journal of Engineering Mechanics
Volume 125, Issue 5
Abstract
An experimental stretch bending study is presented in this paper. A total of 29 tests on 2 m long rectangular hollow section aluminum specimens were performed in a purpose-built stretch bending rig. The tests were carried out under different tensile force combinations, or tensile sequences, in order to investigate the influence of the force on certain response parameters. Stretch bending is an important industrial forming process, and die force, sagging, and springback are thus considered the most relevant response parameters. The tests show that the sagging is very sensitive to the applied tensile sequence. Furthermore, a close correlation between sagging development and strain evolution is observed. The springback is controlled by the tensile force level immediately before unloading. Finally, the difference in response between two tests performed with different constant, tensile force levels is insignificant.
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References
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Clausen, A. H. ( 1998). “Stretch bending of aluminum extrusions: Effect of tensile sequence.” Tech. Rep. R-3-98, Dept. of Struct. Engrg., Norwegian University of Science and Technology, Trondheim, Norway.
2.
Clausen, A. H., Hopperstad, O. S., and Langseth, M. ( 1996). “Stretch bending rig: Experimental set-up.” Tech. Rep. R-9-96, Dept. of Struct. Engrg., Norwegian University of Science and Technology, Trondheim, Norway.
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Published In
Journal of Engineering Mechanics
Volume 125 • Issue 5 • May 1999
Pages: 521 - 529
History
Published online: May 1, 1999
Published in print: May 1999
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