A flexible and robust yield function for geomaterials
Ali Golchin (TU Delft - Civil Engineering & Geosciences)
Philip J. Vardon (TU Delft - Civil Engineering & Geosciences)
William M. Coombs (Durham University)
Michael A. Hicks (TU Delft - Civil Engineering & Geosciences)
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Abstract
This paper presents a new Modified Cam Clay (MCC) type yield function, that is designed for robust and efficient use with implicit stress integration algorithms. The proposed yield function attains non-elliptical (e.g. tear and bullet) shapes, as well as the typical elliptical shape of the MCC model. Like that of MCC, and unlike most other yield functions with non-elliptical shapes available in literature, it is non-singular and unique throughout stress space. The experimental yielding stresses of a wide range of geomaterials have been accurately simulated using the yield surface. The yield function can be used in constitutive models based on classical elasto-plasticity theory.
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