Dresden 2009 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 12: Poster I

DY 12.18: Poster

Dienstag, 24. März 2009, 14:30–16:30, P1A

Elasticity of wet fiber networks — •Ohle Claussen, Martin Brinkmann, and Stephan Herminghaus — MPI for Dynamics and Self-Organization, Bunsenstrasse 10, D-37073 Göttingen

Networks of elastic fibers change their mechanical properties when they become wetted by a liquid. Capillary forces induce an aligning torque between overlapping fibers which causes the formation of fiber bundles. We present a 2D model of randomly distributed straight elastic rods with periodic boundary conditions representing a 3D network of entangled fibers that exhibit both stretching and bending modes. Besides permanent crosslinks we introduce sliding bonds exerting a hysteretic torque on the network in order to model the effects of capillarity. The fibers are coupled to an oscillating external field inducing a time dependent strain in the network. Depending on the amplitude of the strain different dynamic regimes can be observed. We investigate the dissipated energy and the effective shear loss modulus of the fiber network for varying excitations numerically.