Phase field fracture modelling using quasi-Newton methods and a new adaptive step scheme

Philip K. Kristensen, Emilio Martínez Pañeda*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

8 Downloads (Pure)

Abstract

We investigate the potential of quasi-Newton methods in facilitating convergence of monolithic solution schemes for phase field fracture modelling. Several paradigmatic boundary value problems are addressed, spanning the fields of quasi-static fracture, fatigue damage and dynamic cracking. The finite element results obtained reveal the robustness of quasi-Newton monolithic schemes, with convergence readily attained under both stable and unstable cracking conditions. Moreover, since the solution method is unconditionally stable, very significant computational gains are observed relative to the widely used staggered solution schemes. In addition, a new adaptive time increment scheme is presented to further reduce the computational cost while allowing to accurately resolve sudden changes in material behavior, such as unstable crack growth. Computation times can be reduced by several orders of magnitude, with the number of load increments required by the corresponding staggered solution being up to 3000 times higher. Quasi-Newton monolithic solution schemes can be a key enabler for large scale phase field fracture simulations. Implications are particularly relevant for the emerging field of phase field fatigue, as results show that staggered cycle-by-cycle calculations are prohibitive in mid or high cycle fatigue. The finite element codes are available to download from www.empaneda.com/codes.
Original languageEnglish
Article number102446
JournalTheoretical and Applied Fracture Mechanics
Volume107
Number of pages13
ISSN0167-8442
DOIs
Publication statusPublished - 2020

Keywords

  • Phase field fracture
  • Quasi-Newton
  • BFGS
  • Fractured carbonate reservoirs
  • Finite element analysis

Cite this