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Crack Front Segmentation and Facet Coarsening in Mixed-Mode Fracture.

Chih-Hung Chen1, Tristan Cambonie2, Veronique Lazarus2

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Area of Science:

  • Materials Science
  • Solid Mechanics
  • Fracture Mechanics

Background:

  • Planar crack propagation under mixed-mode loading (Mode I and Mode III) is a fundamental problem in fracture mechanics.
  • Previous theoretical predictions suggested a supercritical bifurcation for crack segmentation, contrasting with experimental observations.

Purpose of the Study:

  • To investigate the mechanisms of facet propagation and coarsening in segmented cracks.
  • To reconcile theoretical predictions with experimental observations regarding crack segmentation under mixed-mode loading.

Main Methods:

  • In-situ microscopy observations of fracture surfaces at various stages of quasistatic mixed-mode crack propagation.
  • Phase-field simulations of crack behavior under mixed-mode loading.

Main Results:

  • Demonstrated that the transition from planar to segmented crack fronts is a strongly subcritical bifurcation.
  • Showed that facet coarsening is a self-similar process.
  • Identified a spatial period-doubling instability as the driving mechanism for facet array coarsening.

Conclusions:

  • The study reconciles theoretical predictions with experimental observations of crack segmentation.
  • Provides a detailed understanding of facet propagation and coarsening in mixed-mode fracture.
  • Highlights the role of subcritical bifurcations and self-similar processes in complex fracture patterns.