Isotropic and anisotropic elasto-plastic coupling in clays: a thermodynamic approach. (1st July 2022)

• Record Type: Journal Article
• Authors: Rollo, Fabio; Amorosi, Angelo
• Is Part Of: International journal of solids and structures. Volume 248(2022)
• Publication Date: 2022-07-01
• Subjects: Constitutive modelling -- Thermodynamics -- Elasto-plastic coupling -- Clays -- Plasticity -- Anisotropy; Mechanics, Applied -- Periodicals; Structural analysis (Engineering) -- Periodicals; Elastic solids -- Periodicals; Mécanique appliquée -- Périodiques; Constructions, Théorie des -- Périodiques; Solides élastiques -- Périodiques; Elastic solids; Mechanics, Applied; Structural analysis (Engineering); Periodicals; 624.18
• DOI: 10.1016/j.ijsolstr.2022.111668
• Languages: English
• ISSNs: 0020-7683

Abstract

Abstract: In many solids, like soils and rocks, the elastic behaviour exhibited for very small stress/strain perturbations often depends on the previously experienced plastic dissipative processes: this is commonly referred to as elasto-plastic coupling. In this paper, this phenomenon is examined in a thermodynamic-based constitutive modelling perspective. Within the framework of hyperplasticity theory, a new formulation considering isotropic and rotational hardening is proposed to illustrate two forms of isotropic and anisotropic elasto-plastic coupling for clays. The thermodynamic approach allows some specific features of the phenomenon to be highlighted in more detail as compared to what conventionally derived from the elasto-plasticity theory, with particular reference to the effects of coupling on the yield domain in the Cauchy stress space and the resulting non-associated flow rules. The predictive capability of the model is illustrated with reference to a series of numerical simulations of real and ideal laboratory tests on reconstituted clays.