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- W3100406596 endingPage "046501" @default.
- W3100406596 startingPage "046501" @default.
- W3100406596 abstract "The failure of materials and interfaces is mediated by cracks, nearly singular dissipative structures that propagate at velocities approaching the speed of sound. Crack initiation and subsequent propagation -- the dynamic process of fracture -- couples a wide range of time and length scales. Crack dynamics challenge our understanding of the fundamental physics processes that take place in the extreme conditions within the nearly singular region where material failure occurs. Here, we first briefly review the classic approach to dynamic fracture, Linear Elastic Fracture Mechanics (LEFM), and discuss its successes and limitations. We show how, on the one hand, recent experiments performed on straight cracks propagating in soft brittle materials have quantitatively confirmed the predictions of this theory to an unprecedented degree. On the other hand, these experiments show how LEFM breaks down as the singular region at the tip of a crack is approached. This breakdown naturally leads to a new theoretical framework coined Weakly Nonlinear Fracture Mechanics, where weak elastic nonlinearities are incorporated. The stronger singularity predicted by this theory gives rise to a new and intrinsic length scale, $ell_{nl}$. These predictions are verified in detail through direct measurements. We then theoretically and experimentally review how the emergence of $ell_{nl}$ is linked to a new equation for crack motion, which predicts the existence of a high-speed oscillatory crack instability whose wave-length is determined by $ell_{nl}$. We conclude by delineating outstanding challenges in the field." @default.
- W3100406596 created "2020-11-23" @default.
- W3100406596 creator A5022670391 @default.
- W3100406596 creator A5026235947 @default.
- W3100406596 creator A5057324414 @default.
- W3100406596 date "2014-03-19" @default.
- W3100406596 modified "2023-10-12" @default.
- W3100406596 title "The dynamics of rapid fracture: instabilities, nonlinearities and length scales" @default.
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