Effective Toughness of Heterogeneous Materials with Rate-Dependent Fracture Energy.

  title={Effective Toughness of Heterogeneous Materials with Rate-Dependent Fracture Energy.},
  author={Gabriele Albertini and Mathias Lebihain and François Hild and Laurent Ponson and David S. Kammer},
  journal={Physical review letters},
  volume={127 3},
We investigate the dynamic fracture of heterogeneous materials experimentally by measuring displacement fields as a rupture propagates through a periodic array of obstacles of controlled fracture energy. Our measurements demonstrate the applicability of the classical equation of motion of cracks at a discontinuity of fracture energy: the crack speed jumps at the entrance and exit of an obstacle, as predicted by the crack-tip energy balance within the brittle fracture framework. The speed jump… 

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