Abstract
This paper presents a generalized transitional yielding approach, with any desired number of limit surfaces. The limit surfaces represent various degrees of the hierarchical material memory due to stress history. A new approach for describing the nonassociative behavior of granular materials without using different functions for the yield surface and the plastic potential surface is also formulated. The approach offers a unique and smooth definition for loading, unloading, and reloading, and it does not need to define a conjugate point. It is shown that the two surface model and the INS (infinite yield surface) model can be regarded as 2 extreme cases of the proposed approach.
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