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A flexible and robust yield function for geomaterials

Golchin, A. and Vardon, P.J. and Hicks, M.A. and Coombs, W.M. (2021) 'A flexible and robust yield function for geomaterials.', Computer methods in applied mechanics and engineering., 387 . p. 114162.


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.

Item Type:Article
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Available under License - Creative Commons Attribution Non-commercial No Derivatives 4.0.
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Publisher statement:© 2021 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (
Date accepted:29 August 2021
Date deposited:31 August 2021
Date of first online publication:21 October 2021
Date first made open access:21 October 2021

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