Scaling Shift in Multicracked Fiber Bundles
Fabio Manca, Stefano Giordano, Pier Luca Palla, and Fabrizio Cleri
Physical Review Letters 113, 255501 (2014)
We introduce a viscoleastic model to study the response of a bundle of fibers exposed to external damaging agents. The results are applied to the problem of radiation damage in DNA bundles, as realized in the in-vitro experiments carried out by the joint INSERM project between LIMMS-Centre Oscar Lambret-IEMN.
Abstract: Bundles of fibers, wires, or filaments are ubiquitous structures in both natural and artificial materials. We investigate the bundle degradation induced by an external damaging action through a theoretical model describing an assembly of parallel fibers, progressively damaged by a random population of cracks. Fibers in our model interact by means of a lateral linear coupling, thus retaining structural integrity even after substantial damage. Monte Carlo simulations of the Young’s modulus degradation for increasing crack density demonstrate a remarkable scaling shift between an exponential and a power-law regime. Analytical solutions of the model confirm this behavior, and provide a thorough understanding of the underlying physics.
Thème : Biophysique moléculaire
Equipe : Klara (IEMN)