The mechanical response of semiflexible networks to localized perturbations

Details The mechanical response of semiflexible networks to localized perturbations The mechanical response of semiflexible networks to localized perturbations

2005-05-27

arxiv.org/abs/cond-mat/0505662v2

Physics

Condensed Matter

Soft Condensed Matter

16 pages, 18 figures; substantial changes to text and figures to clarify the crossover to continuum elasticity and the role of

Scientific paper

10.1103/PhysRevE.72.061914

Previous research on semiflexible polymers including cytoskeletal networks in cells has suggested the existence of distinct regimes of elastic response, in which the strain field is either uniform (affine) or non-uniform (non-affine) under external stress. Associated with these regimes, it has been further suggested that a new fundamental length scale emerges, which characterizes the scale for the crossover from non-affine to affine deformations. Here, we extend these studies by probing the response to localized forces and force dipoles. We show that the previously identified nonaffinity length [D.A. Head et al. PRE 68, 061907 (2003).] controls the mesoscopic response to point forces and the crossover to continuum elastic behavior at large distances.

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