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Depinning of Fracture Fronts
Published online by Cambridge University Press: 10 February 2011
Abstract
By studying the morphology of the fracture surfaces of both a metallic alloy and of a silicate glass for various very low crack propagation velocities, it is shown that the pin-ning/depinning scenario of a line moving through randomly distributed obstacles seems well adapted to describe fracture of heterogeneous materials. The crossover length separating the large length scales regime characterised by a roughness index ζ ≃ 0.78 and the small length scales one, for which ζc ≃ 0.5, is shown to decrease with the measured crack velocity as a power law, ξc ∞ v−φ, with ζ ≃ 1. ξc and v also vary with the pulling force as power laws, and the measured values of exponents ν and β are close to: ν ≃ 2 and β ≃ 2.
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- Copyright © Materials Research Society 1997