Phys. Rev. Lett. 76, 1087–1090 (1996)Dynamic Instabilities in FractureReceived 2 November 1995; published in the issue dated 12 February 1996 We find that moving cracks are strongly unstable against deflection in essentially all conventional cohesive-zone models of fracture dynamics. This instability is governed by detailed mechanisms of deformation and decohesion at crack tips; it cannot be detected by quasistatic far-field theories that consider only energy balance and neglect relevant dynamic degrees of freedom. Our picture of intrinsic instability is consistent with a wide range of experimental observations. © 1996 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.76.1087
DOI:
10.1103/PhysRevLett.76.1087
PACS:
62.20.Mk, 03.40.-t, 46.30.Nz, 81.40.Np
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