355 citations · 2.6k across the 109 of their papers we have counts for
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Crossover behavior in failure avalanches
Srutarshi Pradhan, Alex Hansen, Per C. Hemmer
Composite materials, with statistically distributed threshold for breakdown of individual elements, are considered. During the failure process of such materials under external stre…
Networks between Professionals and Society: A Model for Protein Dependency
Henning Frydenlund Hansen, Alex Hansen
We propose a network model with a fixed number of nodes and links with a dynamics which favors links between nodes differing in connectivity. Parameter regimes where the degree dis…
Cluster evolution in steady-state two-phase flow in porous media
Thomas Ramstad, Alex Hansen
We report numerical studies of the cluster development of two-phase flow in a steady-state environment of porous media. This is done by including biperiodic boundary conditions in…
Self-Affinity in the Gradient Percolation Problem
Alex Hansen, G. George Batrouni, Thomas Ramstad +1
We study the scaling properties of the solid-on-solid front of the infinite cluster in two-dimensional gradient percolation. We show that such an object is self affine with a Hurst…
Fracture Roughness and Correlation Length in the Central Force Model
Jan Øystein Haavig Bakke, Thomas Ramstad, Alex Hansen
We measure the roughness exponent and the correlation length exponent of a stress-weighted percolation process in the central force model in 2D. The roughness exponent is found to…
Scaling Laws of Stress and Strain in Brittle Fracture
Bjorn Skjetne, Torbjorn Helle, Alex Hansen
A numerical realization of an elastic beam lattice is used to obtain scaling exponents relevant to the extent of damage within the controlled, catastrophic and total regimes of mod…
Effects of Buckling on Stress and Strain in Thin Randomly Disordered Tension-Loaded Sheets
Bjorn Skjetne, Torbjorn Helle, Alex Hansen
We study how crack buckling affects stress and strain in a thin sheet with random disorder. The sheet is modeled as an elastic lattice of beams where each of the beams have individ…
Stochastic Model for the Interaction of Buckling and Fracture in Thin Tension-Loaded Sheets
Bjorn Skjetne, Torbjorn Helle, Alex Hansen
We introduce a model of fracture which includes the out-of-plane degrees of freedom necessary to describe buckling in a thin-sheet material. The model is a regular square lattice o…
Brittle Crack Roughness in Three-Dimensional Beam Lattices
Bjorn Skjetne, Torbjorn Helle, Alex Hansen
The roughness exponent is reported in numerical simulations with a three-dimensional elastic beam lattice. Two different types of disorder have been used to generate the breaking t…
Superdiffusive Conduction: AC Conductivity with Correlated Noise
Fernando A. Oliveira, Rafael Morgado, Alex Hansen +1
We present evidence of the existence of a superdiffusive regime in systems with correlated disorder for which localization is suppressed. An expression for anomalous electrical con…
Crossover Behavior in Burst Avalanches of Fiber Bundles: Signature of Imminent Failure
Srutarshi Pradhan, Alex Hansen, Per C. Hemmer
Bundles of many fibers, with statistically distributed thresholds for breakdown of individual fibers and where the load carried by a bursting fiber is equally distributed among the…