ISA model: A constitutive model for soils with yield surface in the intergranular strain space |
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| Authors: | W Fuentes Th Triantafyllidis |
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| Institution: | Institute of Soil Mechanics and Rock Mechanics, Karlsruhe Institute of Technology KIT, Karlsruhe, Germany |
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| Abstract: | In this article, a new constitutive model for soils is proposed. It is formulated by means of plasticity, but in contrast to the precedent works, it presents a yield function describing a surface within the intergranular strain space. This latter is a state variable providing information of the recent strain history. An expression for the plastic strain rate has been proposed to guarantee the stress rate continuity. Under the application of medium or large strain amplitudes, the constitutive equation becomes independent of the intergranular strain and delivers a mathematical structure similar to some Karlsruhe hypoplastic models. Some simulations of monotonic and cyclic triaxial test are provided to evaluate and analyze the model performance. Copyright © 2015 John Wiley & Sons, Ltd. |
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| Keywords: | ISA model hypoplasticity saturated sands cyclic loading mechanical behavior |
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