A novel constitutive model for geomaterials in hyperplasticity

Zhang, Zhenguo; Chen, Yongqiang; Huang, Zhuping

doi:10.1016/j.compgeo.2018.01.017

Cited by 12 publications

(5 citation statements)

References 31 publications

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“…The advantage of such framework lies in that it can provide a more rigorous basis to constructing constitutive models, and the laws of thermodynamics are enforced directly in this formulation, so that any model defined within this framework will automatically obey these laws . Some recent examples that follow this framework to constructing the constitutive models can be found in previous studies . In this framework, dissipation does not directly correspond to plastic work, as a portion of plastic work is frozen to partly contribute to free energy that can be converted to do work.…”

Section: Rotated Yield Surfacesmentioning

confidence: 99%

“…44 Some recent examples that follow this framework to constructing the constitutive models can be found in previous studies. 33,39,[45][46][47] In this framework, dissipation does not directly correspond to plastic work, as a portion of plastic work is frozen to partly contribute to free energy that can be converted to do work. The locked-in energy is associated with the unrecoverable deformation or plastic strain for simplicity and can be liberated during shearing as plastic deformation occurs.…”

Section: Rotated Yield Surfacesmentioning

confidence: 99%

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A bounding surface model for anisotropically overconsolidated clay incorporating thermodynamics admissible rotational hardening rule

Chen

Yang

2019

Num Anal Meth Geomechanics

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Summary A bounding surface model is formulated to simulate the behavior of clays that are subject to an anisotropic consolidation stress history. Conventional rotational hardening is revisited from the perspective of thermodynamics. As the free energy cannot be accumulated infinitely upon critical state failure, the deviatoric back stress must vanish. This requires the rotated yield surface to be turned back to eventually align on the hydrostatic axis in the stress plane. Noting that most of the previous propositions violate this restriction, an innovative rotational hardening rule is formulated that is thermodynamically admissible. The bounding surface framework that employs the modified yield surface is applied to simulate elastoplastic deformations for overconsolidated clays, with which the overprediction of strength on the “dry” side can be greatly improved with reasonable results. Other important features, including contractive or dilative response and hardening or softening behavior, can also be well‐captured. It has been shown that the model can simulate three types of reconstituted clays that are sheared with initial conditions over a wide range of anisotropic consolidation stress ratios and overconsolidation ratios under both triaxial undrained and drained conditions. Limitations and potential improvement of the model regarding the fabric anisotropy at critical state have been discussed.

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Section: Rotated Yield Surfacesmentioning

confidence: 99%

Section: Rotated Yield Surfacesmentioning

confidence: 99%

A bounding surface model for anisotropically overconsolidated clay incorporating thermodynamics admissible rotational hardening rule

Chen

Yang

2019

Num Anal Meth Geomechanics

View full text Add to dashboard Cite

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“…satisfying the laws of thermodynamics) constitutive models for a variety of geomaterials (e.g. Collins and Houlsby 1997;Collins and Kelly 2002;Sheng et al 2004;Li 2007;Coussy et al 2010;Collins et al 2010;Tengattini et al 2016;Lai et al 2016;Zhang et al 2018). There are generally two ways to ensure thermodynamic consistency in the constitutive model.…”

Section: Introductionmentioning

confidence: 99%

A Convex Modular Modelling (CMM) framework for developing thermodynamically consistent constitutive models

Suryasentana

Houlsby

2022

Computers and Geotechnics

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“…In light of this, several single-surface hyperplastic models for clays have been developed in the past few years, mainly inspired by the Cam clay-family models (e.g. Collins & Houlsby, 1997;Collins & Kelly, 2002;Einav & Puzrin, 2004b;Coombs & Crouch, 2011;Zhang et al, 2018). To account for plastic anisotropy, Collins & Hilder (2002) introduced a stress-dependent dissipation function which describes a class of distorted yield surfaces, whose shape in the stress space is related to the assumed non-associated flow rule.…”

Section: Introductionmentioning

confidence: 99%