A piecewise linear unified yield criterion called the twin-shear-unified was proposed. It is based on a kind of orthogonal dodecahedron stress element. The effects of intermediate principal stress are taken into account such that most available yield loci on the π-plane are embraced in a unified manner. Besides, it is capable to represent not only convex limit surfaces but also nonconvex limit surfaces.
On the Unification of Yield Criteria
Contributed by the Applied Mechanics Division of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS for publication in the ASME JOURNAL OF APPLIED MECHANICS. Manuscript received and accepted by the ASME Applied Mechanics Division, Feb. 16, 1999; final revision, Nov. 1, 2000. Associate Editor: M.-J. Pindera.
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Fan , S. C., Yu , M., and Yang , S. (February 16, 1999). "On the Unification of Yield Criteria ." ASME. J. Appl. Mech. March 2001; 68(2): 341–343. https://doi.org/10.1115/1.1320451
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