Localisation and lode-angle dependence of geomaterial behaviour
Date
2020
Authors
Le, L.A.
Nguyen, G.D.
Bui, H.H.
Sheikh, A.H.
Kotousov, A.
Editors
Wang, C.M.
Ho, J.C.M.
Kitipornchai, S.
Ho, J.C.M.
Kitipornchai, S.
Advisors
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Conference paper
Citation
ACMSM25: Proceedings of the 25th Australasian Conference on Mechanics of Structures and Materials, 2020 / Wang, C.M., Ho, J.C.M., Kitipornchai, S. (ed./s), vol.37, pp.581-590
Statement of Responsibility
L. A. Le, G. D. Nguyen, H. H. Bui, A. H. Sheikh, A. Kotousov
Conference Name
Australasian Conference on Mechanics of Structures and Materials (ACMSM) (4 Dec 2018 - 7 Dec 2018 : Brisbane, Australia)
Abstract
True triaxial test results of geomaterials have shown a strong dependence of the material responses on the third invariant of the deviatoric stress (or alternatively Lode angle). In constitutive modelling, this dependence is usually captured by incorporating different forms of the Lode angle (i.e. Lode angle parameter, third invariant of deviatoric stress) into the macroscopic yield function phenomenologically. In this paper, the mechanism of localised failure is analysed and identified as the underlying cause of the Lode angle dependence, from which a constitutive model is developed. The model includes an additional kinematic field with its own set of governing relationships to account for the high deformation gradient across the boundary of the localisation band. Since the mechanism of localised failure and its initiation, governed by true triaxial stress states, are included, the Lode-angle dependent behaviour is naturally captured without requiring any phenomenological relationships. In this short correspondence, key characteristics of the proposed approach are outlined together with its preliminary results validated against experimental data.
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© Springer Nature Singapore Pte Ltd. 2020