A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Localisation and Lode-Angle Dependence of Geomaterial Behaviour
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.
Localisation and Lode-Angle Dependence of Geomaterial Behaviour
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.
Localisation and Lode-Angle Dependence of Geomaterial Behaviour
Le, L. A. (author) / Nguyen, G. D. (author) / Bui, H. H. (author) / Sheikh, A. H. (author) / Kotousov, A. (author)
2019-09-04
10 pages
Article/Chapter (Book)
Electronic Resource
English
Mechanics of geomaterial interfaces
| TIBKAT | 1995
Mechanics of geomaterial interfaces
| UB Braunschweig | 1995
Mechanics of geomaterial interfaces
| UB Braunschweig | 1995
Mechanics of geomaterial interfaces
| TIBKAT | 1995