Title
ISA cyclic hypoplasticity (Fuentes et al.)
Description
Hypoplastic models alone reproduce well the behavior of soils under monotonic loading, but fails to simulate its behavior upon cyclic loading. The Intergranular Strain Anisotropy (ISA) is a mathematical extension of conventional hypoplastic models for soils, proposed originally by Fuentes and Triantafyllidis (2015) to improve simulations of cyclic loading. It can be considered as a reformulation of the conventional intergranular strain theory by Niemunis and Herle (1997). Basically, this extension reproduces the following characteristics:
a) Yield surface within the intergranular strain space for elastic strains
b) the stiffness increase upon reversal loading
c) the reduction of the plastic strain rate for same conditions.
ISA-hypoplastic models are also able to reproduce paths of repetitive cycles, and provide an extension to account for cyclic mobility effects and thus, enabling simulations of liquefaction phenomena.
More information: http://www.geo-research.info/umats-for-soils-abaqus/
References
Fuentes, W. (2018) ISA-hypoplastic model, Abaqus implementation [Presentation]
1 file(s) 1.06 MBFuentes, W. and Lascarro, C. (2018). On the simulation of the cyclic mobility effect with an ISA-hypoplastic model. China-Europe Conference on Geotechnical Engineering - Vienna, Workshop in Honor of Gudehus’ Birthday [Presentation]
1 file(s) 3.03 MBFuentes, W. and Triantafyllidis, T. (2015). ISA: A constitutive model for deposited sand. In: Aktuelle Forschung in der Bodenmechanik, 169-187 [Fulltext]
1 file(s) 1.97 MBFuentes, W., Tafili, M. and Triantafyllidis, T. (2018) An ISA-plasticity-based model for viscous and non-viscous clays. Acta Geotechnica 13(2): 367-386 [Preprint]
1 file(s) 5.41 MBFuentes, W., Triantafyllidis, T. and Lascarro, C. (2017). Evaluating the Performance of an ISA-Hypoplasticity Constitutive Model on Problems with Repetitive Loading. In: Holistic Simulation of Geotechnical Installation Processes, 341-362 [Preprint]
1 file(s) 2.65 MBNiemunis, A. and Herle I. (1997) Hypoplastic model for cohesionless soils with elastic strain range. Mechanics of Cohesive-Frictional Materials 2: 279–299 [Preprint]
1 file(s) 416.76 KB
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