A flexible and robust yield function for geomaterials

Ali Golchin, Philip J. Vardon*, William M. Coombs, Michael A. Hicks

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)
20 Downloads (Pure)


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.

Original languageEnglish
Article number114162
Number of pages37
JournalComputer Methods in Applied Mechanics and Engineering
Publication statusPublished - 2021


  • Flexible
  • Implicit stress integration
  • Non-singular
  • Robust
  • Uniqueness
  • Yield surface


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