High Frequency Monitoring Reveals Aftershocks in Subcritical Crack Growth

Abstract : By combining direct imaging and acoustic emission measurements, the subcritical propagation of a crack in a heterogeneous material is analyzed. Both methods show that the fracture proceeds through a succession of discrete events. However, the macroscopic opening of the fracture captured by the images results from the accumulation of more-elementary events detected by the acoustics. When the acoustic energy is cumulated over large time scales corresponding to the image acquisition rate, a similar statistics is recovered. High frequency acoustic monitoring reveals aftershocks responsible for a time scale dependent exponent of the power law energy distributions. On the contrary, direct imaging, which is unable to resolve these aftershocks, delivers a misleading exponent value.
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Menka Stojanova, S. Santucci, L. Vanel, O. Ramos. High Frequency Monitoring Reveals Aftershocks in Subcritical Crack Growth. Physical Review Letters, American Physical Society, 2014, 112 (11), ⟨10.1103/PhysRevLett.112.115502⟩. ⟨hal-01727333v2⟩

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