TY - JOUR
T1 - A thermo-mechanical constitutive model for fine-grained soils based on thermodynamics
AU - Golchin, Ali
AU - Vardon, Philip James
AU - Hicks, Michael Anthony
PY - 2022
Y1 - 2022
N2 - The formulation of a new thermo-mechanical constitutive model consistent with the principles of thermodynamics is presented. The model is capable of predicting the rate-independent thermo-mechanical behavior of fine-grained soils. The constitutive equations are derived by defining only a Gibbs-type free energy and a dissipation potential, in accordance with the hyperplasticity method. The addition of thermo-elasticity to the energy potential, and the embedding of the identified thermo-mechanical mechanisms into a newly proposed dissipation potential, enables the model to describe the thermo-mechanical behavior. The proposed dissipation potential eliminates the application of shift stress, which results in a simpler formulation in the context of hyperplasticity. The step-by-step procedure of deriving the equations, as well as a detailed analysis of the parameters of the model, is presented. The performance of the model is shown to be in good agreement with experimental data. A qualitative description of the possible micro-scale mechanisms for fine-grained soils, when subjected to temperature variation, is presented, as a step towards including the mechanisms in the formulation.
AB - The formulation of a new thermo-mechanical constitutive model consistent with the principles of thermodynamics is presented. The model is capable of predicting the rate-independent thermo-mechanical behavior of fine-grained soils. The constitutive equations are derived by defining only a Gibbs-type free energy and a dissipation potential, in accordance with the hyperplasticity method. The addition of thermo-elasticity to the energy potential, and the embedding of the identified thermo-mechanical mechanisms into a newly proposed dissipation potential, enables the model to describe the thermo-mechanical behavior. The proposed dissipation potential eliminates the application of shift stress, which results in a simpler formulation in the context of hyperplasticity. The step-by-step procedure of deriving the equations, as well as a detailed analysis of the parameters of the model, is presented. The performance of the model is shown to be in good agreement with experimental data. A qualitative description of the possible micro-scale mechanisms for fine-grained soils, when subjected to temperature variation, is presented, as a step towards including the mechanisms in the formulation.
KW - Constitutive model
KW - Dissipation potential
KW - Fine grained soils
KW - Hyperplasticity
KW - Thermo-mechanics
KW - Thermodynamics
UR - http://www.scopus.com/inward/record.url?scp=85127147401&partnerID=8YFLogxK
U2 - 10.1016/j.ijengsci.2021.103579
DO - 10.1016/j.ijengsci.2021.103579
M3 - Article
AN - SCOPUS:85127147401
VL - 174
JO - International Journal of Engineering Science
JF - International Journal of Engineering Science
SN - 0020-7225
M1 - 103579
ER -