TY - JOUR

T1 - Phase-Field Modeling of Thermal Fracture and Shear Heating in Rocks with Degraded Thermal Conductivity Across Crack

AU - You, Tao

AU - Zhu, Qizhi

AU - Li, Weijian

AU - Shao, Jianfu

N1 - Publisher Copyright: © The Chinese Society of Theoretical and Applied Mechanics 2024.

PY - 2024/3/11

Y1 - 2024/3/11

N2 - By incorporating two different fracture mechanisms and salient unilateral effects in rock materials, we propose a thermomechanical phase-field model to capture thermally induced fracture and shear heating in the process of rock failure. The heat conduction equation is derived, from which the plastic dissipation is treated as a heat source. We then ascertain the effect of the non-associated plastic flow on frictional dissipation and show how it improves the predictive capability of the proposed model. Taking advantage of the multiscale analysis, we propose a phase-field-dependent thermal conductivity with considering the unilateral effect of fracture. After proposing a robust algorithm for solving involved three-field coupling and damage-plasticity coupling problems, we present three numerical examples to illustrate the abilities of our proposed model in capturing various thermo-mechanically coupled behaviors.

AB - By incorporating two different fracture mechanisms and salient unilateral effects in rock materials, we propose a thermomechanical phase-field model to capture thermally induced fracture and shear heating in the process of rock failure. The heat conduction equation is derived, from which the plastic dissipation is treated as a heat source. We then ascertain the effect of the non-associated plastic flow on frictional dissipation and show how it improves the predictive capability of the proposed model. Taking advantage of the multiscale analysis, we propose a phase-field-dependent thermal conductivity with considering the unilateral effect of fracture. After proposing a robust algorithm for solving involved three-field coupling and damage-plasticity coupling problems, we present three numerical examples to illustrate the abilities of our proposed model in capturing various thermo-mechanically coupled behaviors.

KW - Heat transfer

KW - Micromechanics

KW - Phase-field

KW - Shear heating

KW - Thermal conductivity degradation

UR - http://www.scopus.com/inward/record.url?scp=85187453118&partnerID=8YFLogxK

U2 - 10.1007/s10338-023-00452-6

DO - 10.1007/s10338-023-00452-6

M3 - Article

AN - SCOPUS:85187453118

VL - 37.2024

SP - 711

EP - 726

JO - Acta mechanica solida Sinica

JF - Acta mechanica solida Sinica

SN - 0894-9166

IS - 5

ER -