title: Roughness of crack interfaces in two-dimensional beam lattices.
abstract: The roughness of crack interfaces is reported in quasistatic fracture, using an elastic network of beams with random breaking thresholds. For strong disorders we obtain zeta = 0.86(3) for the roughness exponent, a result which is very different from the minimum energy surface exponent, i.e., zeta = 2 / 3. A crossover to lower values is observed as the disorder is reduced, the exponent in this regime being strongly dependent on the disorder.
authors.affiliation: Department of Chemical Engineering, Norwegian University of Science and Technology, N-7491 Trondheim, Norway.
authors.forename: B
authors.initials: B
authors.lastname: Skjetne
authors.forename: T
authors.initials: T
authors.lastname: Helle
authors.forename: A
authors.initials: A
authors.lastname: Hansen