Fracture and second-order phase transitions

Details Fracture and second-order phase transitions Fracture and second-order phase transitions

2000-08-08

arxiv.org/abs/cond-mat/0008122v1

Phys. Rev. Lett. 85, 2865 (2000)

Physics

Condensed Matter

Statistical Mechanics

5 pages, 5 figures, APS style, submitted for publication

Scientific paper

10.1103/PhysRevLett.85.2865

Using the global fiber bundle model as a tractable scheme of progressive fracture in heterogeneous materials, we define the branching ratio in avalanches as a suitable order parameter to clarify the order of the phase transition occurring at the collapse of the system. The model is analyzed using a probabilistic approach suited to smooth fluctuations. The branching ratio shows a behavior analogous to the magnetization in known magnetic systems with 2nd-order phase transitions. We obtain a universal critical exponent $\beta\approx 0.5$ independent of the probability distribution used to assign the strengths of individual fibers.

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