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- T. Tallinen, J. A. Åström, Jussi Timonen
- Nature materials
- 2009

Crumpling a thin sheet of material into a small volume requires energy for creating a network of deformations such as vertices and ridges. Scaling properties of a single elastic vertex or ridge have… (More)

- J. A. Åström, F Ouchterlony, Riku Linna, Jussi Timonen
- Physical review letters
- 2004

A generic model is introduced for brittle fragmentation in D dimensions, and this model is shown to lead to a fragment-size distribution with two distinct components. In the small fragment-size limit… (More)

A numerical model of fragmentation of a two-dimensional granular medium under pressure is investigated. The fragmentation process is found to be strongly dependent on the type of force used as the… (More)

- Pekka Kekäläinen, J. A. Åström, Jussi Timonen
- Physical review. E, Statistical, nonlinear, and…
- 2007

It is well established that rapidly propagating cracks in brittle material are unstable such that they generate side branches. It is also known that cracks are attracted by free surfaces, which means… (More)

- Riku Linna, J. A. Åström, Jussi Timonen
- Physical review. E, Statistical, nonlinear, and…
- 2005

It has been shown previously that dynamic fragmentation of brittle D -dimensional objects in a D -dimensional space gives rise to a power-law contribution to the fragment-size distribution with a… (More)

- J. A. Åström, Arkady V Krasheninnikov, Kai Nordlund
- Physical review letters
- 2004

We employ a theoretical model to calculate mechanical characteristics of macroscopic mats and fibers of single-walled carbon nanotubes. We further investigate irradiation-induced covalent bonds… (More)

- J. A. Åström, Riku Linna, Jussi Timonen, Peder Friis Møller, Lene B. Oddershede
- Physical review. E, Statistical, nonlinear, and…
- 2004

Generic arguments, a minimal numerical model, and fragmentation experiments with gypsum disk are used to investigate the fragment-size distribution that results from dynamic brittle fragmentation.… (More)

- J. A. Åström, Jussi Timonen, Mikko Karttunen
- Physical review letters
- 2004

A first-principles numerical model for crumpling of a stiff tethered membrane is introduced. This model displays wrinkles, ridge formation, ridge collapse, and initiation of stiffness divergence. The… (More)

- J. A. Åström, Mikko Karttunen
- Physical review. E, Statistical, nonlinear, and…
- 2006

Cellular aggregates may be considered as collections of membrane enclosed units with a pressure difference between the internal and external liquid phases. Cells are kept together by membrane… (More)

- J. A. Åström, P B Sunil Kumar, Mikko Karttunen
- Physical review. E, Statistical, nonlinear, and…
- 2012

We demonstrate the existence of a percolationlike stiffness transition in fiber networks with a bidisperse orientation distribution and with fiber densities clearly above the geometrical and the… (More)