Summary
The article outlines a seven-parametric yield function for geomaterials such as soils and rocks. Proceeding from a geometric representation in the principal stress space, the yield surface exhibits a closed shape, thus reflecting the sensitivity of the plastic response of this type of media to hydrostatic stresses. The yield function is able to describe the effects of primary yielding, as well as of isotropic and kinematic hardening. In addition the failure envelope contains an open cone when the number of material parameters is reduced from seven to five.
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Dedicated to F. G. Kollmann on the occasion of his 60th birthday
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Ehlers, W. A single-surface yield function for geomaterials. Arch. Appl. Mech. 65, 246–259 (1995). https://doi.org/10.1007/BF00805464
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DOI: https://doi.org/10.1007/BF00805464