Abstract
The problem of dynamic symmetric branching of a tensile crack propagating in a brittle material is studied within Linear Elastic Fracture Mechanics theory. The Griffith energy criterion and the principle of local symmetry provide necessary conditions for the onset of dynamic branching instability and for the subsequent paths of the branches. The theory predicts a critical velocity for branching and a well defined shape described by a branching angle and a curvature of the side branches. The model rests on a scenario of crack branching based on reasonable assumptions and on exact dynamic results for the anti-plane branching problem. Our results reproduce within a simplified 2D continuum mechanics approach the main experimental features of the branching instability of fast cracks in brittle materials.
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Katzav, E., Adda-Bedia, M. & Arias, R. Theory of dynamic crack branching in brittle materials. Int J Fract 143, 245–271 (2007). https://doi.org/10.1007/s10704-007-9061-x
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DOI: https://doi.org/10.1007/s10704-007-9061-x