...Sheng Zeng; Mahdi Taiebat; Yannis F. Dafalias A new constitutive model based on bounding surface plasticity, developed within anisotropic critical state theory ( ACST ) and incorporating a memory surface, is proposed to simulate sand response with emphasis on cyclic liquefaction. The formulation...

...Dechun Lu; Haoran Jin; Zhiwei Gao; Xin Zhou; Xiuli Du Conventional plasticity assumes that a yield surface exists and the direction of plastic strain increment (DPSI) is uniquely dependent on the current stress state. Triaxial stress probing tests of yield and plastic flow of sand have been...

... differential equations capturing flowslide hydromechanics is obtained by specifying them for a perfectly plastic constitutive law. This result enables a comprehensive examination of the factors that control whether the landslide motion, once triggered, autonomously comes to rest (self-regulating behaviour...

...S. A. Ghoreishian Amiri; G. Grimstad; D. Dadras-Ajirlou This paper presents a simple and flexible integration scheme designed to capture the elastic–plastic behaviour of materials directly from a free energy function, a dissipation function and kinematic constraints, typically formulated in strain...

... constitutive model for the hydro-mechanical behaviour of unsaturated soils is formulated and implemented within the framework of elasto-plasticity with internal variables. The effect of recent suction history is incorporated using a kinematic hardening constitutive model augmented by elements of bounding...

... of both commonly used and highly advanced constitutive models. 15 09 2023 21 09 2023 Emerald Publishing Limited: All rights reserved 2024 constitutive models elasticity numerical analysis plasticity simulation The desire to understand the physical world...

.... The mathematical difficulties involved with the flow rate calculation when the stress state lies on the corner/edge of two adjacent (Mohr–Coulomb) yield surfaces, for both cylindrical and spherical cases, are tackled by using the generalised Koiter theory for non-associated plasticity. In particular, through...

... to be added and, in this regard, the existence of sampling planes, their spatial orientations and independently evolving deformation histories provide a unique and physically understandable way to formulate anisotropy. anisotropy constitutive relations fabric/structure of soils plasticity sands...

..., 2000 ; Yin et al., 2002). The above-mentioned important limitations of the phenomenological models, including the MCC model and its offshoots, could stem from the crude assumption of homogeneous plastic flow within the representative elementary volume (REV) (Coussy, 1995...

... of a material point graphically into the elastic and plastic components in the deviatoric strain plane. It allows the effective stress path in the deviatoric plane to be readily determined by solving a first-order differential equation with the Lode angle being the single variable. The desired limiting cavity...

..., for the expansion of cavities from zero initial radius in cohesive-frictional soils with limited dilation. In particular, the radius of the elastic–plastic interface c is used in this paper as the timescale and the solution for the limit pressure has been presented. Solutions are evaluated for a number...

...An Zhang; Yannis F. Dafalias; Mingjing Jiang A plasticity model is proposed to simulate the monotonic and cyclic behaviour of cemented sand. The model is an extension of the critical state-based bounding surface plasticity model originally developed for clean sand by researchers Y. F. Dafalias...

... as a rigid–perfectly plastic material that follows the Mohr–Coulomb (MC) failure criterion and the associated flow rule. (b) The shallow foundation is perfectly rigid and weightless, and only the self-weight of soils is accounted for. (c) The roughness of the soil–foundation interface is represented...

... based on underlying principles of mechanics, considering the pipeline–seabed sliding response as rigid plastic. The analytical solution allows calculation of the cumulative displacement, strain, axial force and soil resistance along the pipeline under arbitrary temperature or internal pressure change...

...-thickness localisation band. 3 t = t i = t o 4 σ = f σ i + 1 − f σ o 03 04 2020 12 11 2020 © 2021 Thomas Telford Ltd 2021 constitutive relations plasticity strain stress path Strain localisation is a common...

...Ming Yang; Mahdi Taiebat; Yannis F. Dafalias A new constitutive model for sand is formulated by incorporating two new constitutive ingredients into the platform of a reference critical state compatible bounding surface plasticity model with kinematic hardening, in order to address primarily...

... that, while current industry guidance is appropriate for the low-plasticity clays for which much previous research has been carried out, it may be overly conservative for high-plasticity clays such as those found in the Gulf of Guinea or the Gulf of Mexico, owing to the differing strength and density...

... to horizontal eccentricities of the applied lateral loads. In this paper, an upper bound mechanism and a lower bound stress field are presented for the calculation of the ultimate combined torsional and lateral loads on single piles in clay. The corresponding analytical upper and lower bound plasticity...

... variation along its length, and whose properties may vary with depth, the nodes’ equilibrium results in the following linear system of equations finite-element modelling footings/foundations plasticity soil/structure interaction Thermally activated structures, also known as energy...

... perturbation and the material constitutive parameters. 09 02 2019 06 11 2019 © 2019 Thomas Telford Ltd 2019 creep landslides plasticity slopes In the scientific literature landslides are classified as creeping or fast landslides according to their evolution with time: creeping...