Item
Cruz Hidalgo, RaÃºl
KovÃ¡cs, K. Pagonabarraga Mora, Ignacio Kun, F. 

2008  
We study the effect of strong heterogeneities on the fracture of disordered materials using a fiber bundle model. The bundle is composed of two subsets of fibers, i.e. a fraction 0 â‰¤ Î± â‰¤ 1 of fibers is unbreakable, while the remaining 1  Î± fraction is characterized by a distribution of breaking thresholds. Assuming global load sharing, we show analytically that there exists a critical fraction of the components Î±c which separates two qualitatively diferent regimes of the system: below Î±c the burst size distribution is a power law with the usual exponent Æ¬= 5/2, while above Î±c the exponent switches to a lower value Æ¬ = 9/4 and a cutoff function occurs with a diverging characteristic size. Analyzing the macroscopic response of the system we demonstrate that the transition is conditioned to disorder distributions where the constitutive curve has a single maximum and an inflexion point defining a novel universality class of breakdown phenomena  
application/pdf  
02955075 (versiÃ³ paper) 12864854 (versiÃ³ electrÃ²nica) 

http://hdl.handle.net/10256/7553  
eng  
Institute of Physics, SocietÃ Italiana di Fisica  
ReproducciÃ³ digital del document publicat a: http://dx.doi.org/10.1209/02955075/81/54005 Articles publicats (DF) 

Â© EPL (Europhysics Letters), 2008, vol. 81, nÃºm. 5, p. 54005  
Tots els drets reservats  
MecÃ nica de fractura
Fracture mechanics Materials  Fatiga Materials  Fatigue 

Universality class of fiber bundles with strong heterogeneities  
info:eurepo/semantics/article  
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