Crack roughness in the two-dimensional random threshold beam model

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Journal Title
Journal ISSN
Volume Title
School of Science | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2008
Major/Subject
Mcode
Degree programme
Language
en
Pages
046105/1-8
Series
Physical Review E, Volume 78, Issue 4
Abstract
We study the scaling of two-dimensional crack roughness using large scale beam lattice systems. Our results indicate that the crack roughness obtained using beam lattice systems does not exhibit anomalous scaling in sharp contrast to the simulation results obtained using scalar fuse lattices. The local and global roughness exponents (ζloc and ζ, respectively) are equal to each other, and the two-dimensional crack roughness exponent is estimated to be ζloc=ζ=0.64±0.02. Removal of overhangs (jumps) in the crack profiles eliminates even the minute differences between the local and global roughness exponents. Furthermore, removing these jumps in the crack profile completely eliminates the multiscaling observed in other studies. We find that the probability density distribution p[Δh(l)] of the height differences Δh(l)=[h(x+l)−h(x)] of the crack profile obtained after removing the jumps in the profiles follows a Gaussian distribution even for small window sizes (l).
Description
Keywords
two-dimensional crack roughness, scaling, large scale beam lattice systems
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Citation
Nukala, Phani K. V. V. & Zapperi, Stefano & Alava, Mikko J. & Simunovic, Srdan. 2008. Crack roughness in the two-dimensional random threshold beam model. Physical Review E. Volume 78, Issue 4. 046105/1-8. ISSN 1539-3755 (printed). DOI: 10.1103/physreve.78.046105.