Experimental characterization and numerical modelling of fracture processes in granite

Francesco Parisio, Ali Tarokh, Roman Makhnenko, Dmitri Naumov, Xing Yuan Miao, Olaf Kolditz, Thomas Nagel

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Failure in brittle rock happens because micro-cracks in the crystal structure coalesce and form a localized fracture. The propagation of the fracture is in turn strongly influenced by dissipation in the fracture process zone. The classical theory of linear elastic fracture mechanics falls short in describing failure when the dissipation in the fracture process zone is non-negligible; thus, a non-linear theory should be employed instead. Here we present a study in which we explore the characteristics of the fracture process zone in granite. We have combined fracture tests on Adelaide black granite with acoustic emission detection and finite element analyses by using a non-local integral plastic-damage constitutive theory. We have further employed the theory of configurational mechanics to support our interpretation of the evolution of the fracture process zone with strong energy-based arguments. We demonstrate that the size of the fracture process zone is non-negligible and dissipative phenomena related to micro-cracking play an important role. Our results indicate this role should be assessed case by case, especially in laboratory-sized analyses, which mostly deflect from theories of both size-independent plasticity and linear elastic fracture mechanics. When strong non-linearities occur, we show that fracture energy can be correctly computed with the help of configurational mechanics and that complex numerical simulation techniques can substantially facilitate the interpretation of experiments designed to highlight the dominant physical mechanisms driving fracture.

Original languageEnglish (US)
Pages (from-to)102-116
Number of pages15
JournalInternational Journal of Solids and Structures
Volume163
DOIs
StatePublished - May 15 2019
Externally publishedYes

Bibliographical note

Funding Information:
We thank Joe Labuz for permission to publish data on the three-point bending tests. The contribution of F.P. was financed by the GEMex project. The GEMex project is supported by the European Union's Horizon 2020 programme for Research and Innovation under grant agreement No 727550. Research by A.T. was supported as part of the Center for Geologic Storage of CO

Funding Information:
We thank Joe Labuz for permission to publish data on the three-point bending tests. The contribution of F.P. was financed by the GEMex project. The GEMex project is supported by the European Union’s Horizon 2020 programme for Research and Innovation under grant agreement No 727550 . Research by A.T. was supported as part of the Center for Geologic Storage of CO 2 , an Energy Frontier Research Center funded by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES), under Award # DE-SC0C12504 . Partial support for R.M. contribution was provided by UIUC-ZJU Research Collaboration grant #083650. X.Y.M. acknowledges the German Federal Ministry of Economic Affairs and Energy for funding under Grant no. 0325547C (IGLU project). The authors gratefully acknowledge the funding provided by the German Federal Ministry of Education and Research (BMBF) for the GeomInt project, Grant Number 03G0866A , as well as the support of the Project Management Jülich (PtJ). Susan Krusemark edited the manuscript.

Funding Information:
We thank Joe Labuz for permission to publish data on the three-point bending tests. The contribution of F.P. was financed by the GEMex project. The GEMex project is supported by the European Union's Horizon 2020 programme for Research and Innovation under grant agreement No 727550. Research by A.T. was supported as part of the Center for Geologic Storage of CO2, an Energy Frontier Research Center funded by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES), under Award #DE-SC0C12504. Partial support for R.M. contribution was provided by UIUC-ZJU Research Collaboration grant #083650. X.Y.M. acknowledges the German Federal Ministry of Economic Affairs and Energy for funding under Grant no. 0325547C (IGLU project). The authors gratefully acknowledge the funding provided by the German Federal Ministry of Education and Research (BMBF) for the GeomInt project, Grant Number 03G0866A, as well as the support of the Project Management J?lich (PtJ). Susan Krusemark edited the manuscript.

Publisher Copyright:
© 2018 The Author(s)

Keywords

  • Crack-tip plasticity
  • Finite elements
  • Fracture mechanisms
  • Mechanical testing
  • OpenGeoSys

Fingerprint

Dive into the research topics of 'Experimental characterization and numerical modelling of fracture processes in granite'. Together they form a unique fingerprint.

Cite this