Abstract
It is shown in this paper that a slightly modified form of the rigid-plastic yield-vertex model for geological materials will contain as a special case both the rigid-plastic form of the yield-vertex model and the sliding deformation model. This result is interesting because the yield-vertex model is a prefailure model and the sliding deformation model is a post-failure model. The specific result of interest is that, if the two pairs of localization directions in the nonwork-hardening form of the rigid-plastic yield-vertex model coincide, then the continued deformation in the post-failure regime is that hypothesized in the sliding deformation model. The analysis is confined to two dimensions.
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