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High-Temperature Rupture of 5083-Al Alloy under Multiaxial Stress States  

Kim Ho-Kyung (Department of Automotive Engineering, Seoul National University of Technology)
Chun Duk-Kyu (Department of Automotive Engineering, Seoul National University of Technology)
Kim Sung- Hoon (Department of Structural Engineering, Seoul National University of Technology)
Publication Information
Journal of Mechanical Science and Technology / v.19, no.7, 2005 , pp. 1432-1440 More about this Journal
Abstract
High-temperature rupture behavior of 5083-Al alloy was tested for failure at 548K under multiaxial stress conditions: uniaxial tension using smooth bar specimens, biaxial shearing using double shear bar specimens, and triaxial tension using notched bar specimens. Rupture times were compared for uniaxial, biaxial, and triaxial stress conditions with respect to the maximum principal stress, the von Mises effective stress, and the principal facet stress. The results indicate that the von Mises effective and principal facet stresses give good correlation for the material investigated, and these parameters can predict creep life data under the multiaxial stress states with the rupture data obtained from specimens under the uniaxial stress. The results suggest that the creep rupture of this alloy under the testing condition is controlled by cavitation coupled with highly localized deformation process, such as grain boundary sliding. It is also conceivable that strain softening controls the highly localized deformation modes which result in cavitation damage in controlling rupture time of this alloy.
Keywords
Multiaxial Stress States; High-Temperature Rupture; Principal Facet Stress; Creep Cavitation; Damage Tolerance;
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Times Cited By Web Of Science : 0  (Related Records In Web of Science)
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