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Depinning of Fracture Fronts

Published online by Cambridge University Press:  10 February 2011

P. Daguier ,
B. Nghiem ,
E. Bouchaud  and
F. Creuzet
P. Daguier
Affiliation:
O.N.E.R.A. (OM), 29 Avenue de la Division Leclerc, B.P. 72, 92322 Châtillon Cedex, FRANCE
B. Nghiem
Affiliation:
Laboratoire CNRS/Saint-Gobain “Surface du Verre et Interfaces”, 39, Quai Lucien Lefranc, B.P. 135, 93303 Aubervilliers Cedex, FRANCE
E. Bouchaud
Affiliation:
O.N.E.R.A. (OM), 29 Avenue de la Division Leclerc, B.P. 72, 92322 Châtillon Cedex, FRANCE
F. Creuzet
Affiliation:
Laboratoire CNRS/Saint-Gobain “Surface du Verre et Interfaces”, 39, Quai Lucien Lefranc, B.P. 135, 93303 Aubervilliers Cedex, FRANCE
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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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 463: Symposia EE – Statistical Mechanics in Physics and Biology , 1996 , 195
Copyright
Copyright © Materials Research Society 1997

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References

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