Abstract
We report on two-dimensional computer simulations of frictionless granular packings at various area fractions above the jamming point . We measure the anisotropy in coarse-grained stress and shear modulus as functions of coarse-graining scale, . can be collapsed onto a master curve after rescaling by a characteristic length scale and by an anisotropy magnitude . Both and accelerate as from above, consistent with a divergence at . shows no characteristic length scale and has a nontrivial power-law form, , over almost the entire range of at all . These results suggest that the force chains present in the spatial structure of the quenched stress may be governed by different physics than the anomalous elastic response near jamming.
- Received 3 May 2011
DOI:https://doi.org/10.1103/PhysRevLett.107.268001
© 2011 American Physical Society