A Yield Criterion Based on Mean Shear Stress

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This work investigates the relation between shear stress and plastic yield considering that a crystal can only deform in a limited set of directions. The shear stress in arbitrary directions is mapped for some cases showing relevant differences. Yield loci based on mean shear stress are constructed. The Tresca yield criterion can be improved by averaging the shear stress over directions near the direction of maximum shear stress. Yield criteria based on averaging over crystallographic direction show a clear influence of the actual orientation of these direction, notably in case of few crystallographic directions. The general finding is that the higher the isotropy of a material, the lower the plane strain factor. The shape of the yield loci is comparable to those derived by the Hershey criterion with exponents lower than 3.

Info:

Periodical:

Key Engineering Materials (Volumes 611-612)

Edited by:

Jari Larkiola

Pages:

3-10

Citation:

W. C. Emmens and A.H. van den Boogaard, "A Yield Criterion Based on Mean Shear Stress", Key Engineering Materials, Vols. 611-612, pp. 3-10, 2014

Online since:

May 2014

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$38.00

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[1] P. Stepin. Strength of Materials. P. Noordhoff Ltd, Groningen, the Netherlands, 2nd edition (year of publication unknown, presumably early 60's).

[2] A.V. Hershey. The plasticity of an isotropic aggregate of anisotropic face-centered cubic crystals. J. Appl. Mech., 21 (1954), pp.241-249.