A multi‐mechanism constitutive model for plastic adaption under cyclic loading |
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| Authors: | Claudio di Prisco Giuseppe Mortara |
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| Institution: | 1. Department of Structural Engineering, Politecnico di Milano, , 20133 Milan, Italy;2. DICEAM, University of Reggio Calabria, , 89122 Reggio Calabria, Italy |
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| Abstract: | As is well known, granular soils under cyclic loading dissipate a large amount of energy and accumulate large irreversible strains. Usually, with time, this second effect reduces and the accumulation rate decreases with the number of cycles until obtaining a sort of ideal stationary cyclic state at which ratcheting disappears. In this paper, only this ideal state is taken into consideration and simulated by means of a multi‐mechanism constitutive model for plastic adaptation. For this purpose, the concept of cycle is discussed, many different categories of cyclic stress/strain paths are considered and some theoretical issues concerning both the flow and the strain‐hardening rules are tackled. Even though the paper focuses on soil behaviour, the conclusions can be extended to all materials exhibiting ratcheting due to volumetric behaviour.Copyright © 2013 John Wiley & Sons, Ltd. |
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| Keywords: | constitutive modelling elasto‐plasticity multi‐surface plasticity rotational hardening cyclic loading soils |
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