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How moving cracks in brittle solids choose their path

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arxiv 2004.03115 v3 pith:2QGXR6FZ submitted 2020-04-07 cond-mat.soft

How moving cracks in brittle solids choose their path

Lital Rozen-Levy (1) , John M. Kolinski (2) , Gil Cohen (1) , Jay Fineberg (1) ((1) The Racah Institute of Physics , The Hebrew University of Jerusalem , Givat Ram , Jerusalem Israel , (2) \'Ecole Polytechnique F\'ed\'erale de Lausanne
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Lausanne Switzerland)
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classification cond-mat.soft
keywords cracksbrittlecrackeitherfundamentallymovingpathssolids
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While we fundamentally understand the dynamics of 'simple' cracks propagating in brittle solids within perfect (homogeneous) materials, we do not understand how paths of moving cracks are determined. We experimentally study strongly perturbed cracks that propagate between 10-95\% of their limiting velocity within a brittle material. These cracks are deflected by either interaction with sparsely implanted defects or via an intrinsic oscillatory instability in defect-free media. Dense, high-speed measurements of the strain fields surrounding the crack tips reveal that crack paths are governed by the direction of maximal strain energy density. This fundamentally important result may be utilized to either direct or guide running cracks.

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