Experimental Investigation of Corners in the Yield Surface

[+] Author and Article Information
Aris Phillips

Yale University, New Haven, Conn.

G. A. Gray

Virginia Polytechnic Institute, Blacksburg, Va.

J. Basic Eng 83(2), 275-288 (Jun 01, 1961) (14 pages) doi:10.1115/1.3658944 History: Received April 20, 1960; Online November 04, 2011


The results of fourteen combined stress tests with variable stress ratios on annealed commercially pure aluminum are reported. These tests were made on a combined tension-torsion testing machine of a dead-load type. It is shown that the loading path carries a pointed vertex with it. However, the direction of the plastic-strain increment vector differs only slightly from the direction predicted by the Mises theory. Finally, the experiments indicate that the form of the yield surface at a considerable distance from the stress increment vector agrees much better with the prediction of the slip theory than it does with the prediction of the Mises theory.

Copyright © 1961 by ASME
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