Journal
PHYSICAL REVIEW LETTERS
Volume 115, Issue 26, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.115.265503
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Funding
- U.S. Department of Energy, Office of Basic Energy Sciences [DE-FG02-07ER46400]
- Massachusetts Green High Performance Computing Center
- ANR GeoSMEC [2012-BS06-0016-03]
- Ministerio de Economia y Competitividad of Spain
- FEDER [FIS2012-37655-C02-01]
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A planar crack generically segments into an array of daughter cracks shaped as tilted facets when loaded with both a tensile stress normal to the crack plane (mode I) and a shear stress parallel to the crack front (mode III). We investigate facet propagation and coarsening using in situ microscopy observations of fracture surfaces at different stages of quasistatic mixed-mode crack propagation and phase-field simulations. The results demonstrate that the bifurcation from propagating a planar to segmented crack front is strongly subcritical, reconciling previous theoretical predictions of linear stability analysis with experimental observations. They further show that facet coarsening is a self-similar process driven by a spatial period-doubling instability of facet arrays.
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