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Cracks Faster than the Shear Wave Speed

Rosakis, A. J. ; Samudrala, O. ; Coker, D.

Science, May 21, 1999, Vol.284(5418), p.1337 [Periódico revisado por pares]

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  • Título:
    Cracks Faster than the Shear Wave Speed
  • Autor: Rosakis, A. J. ; Samudrala, O. ; Coker, D.
  • Assuntos: Fracture Mechanics -- Research ; Shear (Mechanics) -- Research
  • É parte de: Science, May 21, 1999, Vol.284(5418), p.1337
  • Descrição: Classical dynamic fracture theories predict the surface wave speed to be the limiting speed for propagation of in-plane cracks in homogeneous, linear elastic materials subjected to remote loading. This report presents experimental evidence to the contrary. Intersonic shear-dominated crack growth featuring shear shock waves was observed along weak planes in a brittle polyester resin under far-field asymmetric loading. When steady-state conditions were attained, the shear cracks propagated at speeds dose to [square root of 2] times the material shear wave speed. These observations have similarities to shallow earthquake events where intersonic shear rupture speeds have been surmised.

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