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Updated: May 14, 2026

Full-field Strain Measurements for Microstructurally Small Fatigue Crack Propagation Using Digital Image Correlation Method
Published on: January 16, 2019
Dynamic stability of crack fronts: out-of-plane corrugations
Mokhtar Adda-Bedia1, Rodrigo E Arias, Eran Bouchbinder
1Ecole Normale Supérieure, Laboratoire de Physique Statistique, Université Pierre et Marie Curie, Paris 6, France.
Abstract:
The dynamics and stability of brittle cracks are not yet fully understood. Here we use the Willis-Movchan 3D linear perturbation formalism [J. Mech. Phys. Solids 45, 591 (1997)] to study the out-of-plane stability of planar crack fronts in the framework of linear elastic fracture mechanics. We discuss a minimal scenario in which linearly unstable crack front corrugations might emerge above a critical front propagation speed. We calculate this speed as a function of Poisson's ratio and show that corrugations propagate along the crack front at nearly the Rayleigh wave speed. Finally, we hypothesize about a possible relation between such corrugations and the long-standing problem of crack branching.
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