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

Publikationen: Beitrag in FachzeitschriftArtikelForschung(peer-reviewed)

Autoren

  • Tao You
  • Qizhi Zhu
  • Weijian Li
  • Jianfu Shao

Externe Organisationseinheiten

  • Hohai University, Nanjing
  • Helmholtz Zentrum für Umweltforschung, Leipzig
  • Shenzhen University
  • University of Lille

Abstract

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.

Details

OriginalspracheEnglisch
Seiten (von - bis)711-726
Seitenumfang16
FachzeitschriftActa mechanica solida Sinica
Jahrgang37.2024
Ausgabenummer5
DOIs
StatusVeröffentlicht - 11 März 2024