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- W2899683440 abstract "Abstract Spontaneously propagating cracks in solids emit both pressure and shear waves. When a shear crack propagates faster than the shear wave speed of the material, the coalescence of the shear wavelets emitted by the near-crack-tip region forms a shock front that significantly concentrates particle motion. Such a shock front should not be possible for pressure waves, because cracks should not be able to exceed the pressure wave speed in isotropic linear-elastic solids. In this study, we present full-field experimental measurements of dynamic shear cracks in viscoelastic polymers that result in the formation of a pressure shock front, in addition to the shear one. The apparent violation of classic theories is explained by the strain-rate-dependent material behavior of polymers, where the crack speed remains below the highest pressure wave speed prevailing locally around the crack tip. These findings have important implications for the physics and dynamics of shear cracks such as earthquakes." @default.
- W2899683440 created "2018-11-16" @default.
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- W2899683440 date "2018-11-12" @default.
- W2899683440 modified "2023-09-25" @default.
- W2899683440 title "Pressure shock fronts formed by ultra-fast shear cracks in viscoelastic materials" @default.
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- W2899683440 doi "https://doi.org/10.1038/s41467-018-07139-4" @default.
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