We study the effect of the sample thickness in planar crack front propagation in a disordered elastic medium using the random fuse model. We employ different loading conditions and we test their stability with respect to crack growth. We show that the thickness induces characteristic lengths in the stress enhancement factor in front of the crack and in the stress transfer function parallel to the crack. This is reflected by a thickness-dependent crossover scale in the crack front morphology that goes from from multiscaling to self-affine with exponents, in agreement with line depinning models and experiments. Finally, we compute the distribution of crack avalanches, which is shown to depend on the thickness and the loading mode.

Role of the sample thickness in planar crack propagation / P. Barai, P.K.V.V. Nukala, M.J. Alava, S. Zapperi. - In: PHYSICAL REVIEW E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS. - ISSN 1539-3755. - 88:4(2013 Oct 28), pp. 042411.1-042411.7. [10.1103/PhysRevE.88.042411]

Role of the sample thickness in planar crack propagation

S. Zapperi
2013

Abstract

We study the effect of the sample thickness in planar crack front propagation in a disordered elastic medium using the random fuse model. We employ different loading conditions and we test their stability with respect to crack growth. We show that the thickness induces characteristic lengths in the stress enhancement factor in front of the crack and in the stress transfer function parallel to the crack. This is reflected by a thickness-dependent crossover scale in the crack front morphology that goes from from multiscaling to self-affine with exponents, in agreement with line depinning models and experiments. Finally, we compute the distribution of crack avalanches, which is shown to depend on the thickness and the loading mode.
Characteristic length; Elastic medium; Loading condition; Loading modes; Planar cracks; Random fuse models; Sample thickness; Stress enhancement
Settore FIS/02 - Fisica Teorica, Modelli e Metodi Matematici
28-ott-2013
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/297438
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