Eur. Phys. J. B 32, 369-374 (2003)
https://doi.org/10.1140/epjb/e2003-00111-x

Analysis of long crack lines in paper webs

¹ Helsinki University of Technology, Laboratory of Physics, PO Box 1100, 02015 HUT, Finland
² KCL Science and Consulting, PO Box 70, 02151 Espoo, Finland

Corresponding author: ^a lsa@fyslab.hut.fi

Received: 9 December 2002
Published online: 11 April 2003

Abstract

We analyze 6500 mm long fracture lines of paper as an example of crack propagation involving disorder. The cracks are asymptotically self-affine, with a roughness exponent close to 0.6. Systematic deviations from the power-law-scaling exist below a lengthscale related to the microscopic heterogeneities and possibly to a cross-over from 3d to 2d crack propagation. Several analysis methods are discussed, including first return analysis and the detection of correlated trends.