Time-dependent relaxation processes continue after forming of sheet metal components. Mechanical properties and even the shape of the part may evolve with time. Beverage can ends, made of an aluminum-magnesium alloy, provide one example of relaxation in a metal product. Ends are manufactured in a series of forming operations, and the can end buckle pressure plays an important role in the design. It has been established that buckle pressure decreases with time in service. In this work, we outline a simple bending test to study relaxation at stress levels well below the usual 0.2 percent offset yield stress. The evolution of stress and development of plastic strain with time are assessed through a simple analysis of springback. The microplastic processes that lead to permanent deformation of the bent beam are well characterized by a model developed by Garmestani and Hart.
An Assessment of In-Service Stress Relaxation of a Work-Hardened Aluminum Magnesium Alloy
Contributed by the Materials Division for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received by the Materials Division June 2, 2003; revision received November 21, 2003. Associate Editor: H. M. Zbib.
- Views Icon Views
- Share Icon Share
- Cite Icon Cite
- Search Site
Zhu , L., Beaudoin, A. J., and MacEwen, S. R. (March 18, 2004). "An Assessment of In-Service Stress Relaxation of a Work-Hardened Aluminum Magnesium Alloy ." ASME. J. Eng. Mater. Technol. April 2004; 126(2): 157–163. https://doi.org/10.1115/1.1647128
Download citation file:
- Ris (Zotero)
- Reference Manager