Regensburg 2019 – wissenschaftliches Programm
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BP: Fachverband Biologische Physik
BP 21: Biopolymers, biomaterials and bioinspired functional materials (joint session CPP/BP)
BP 21.7: Vortrag
Mittwoch, 3. April 2019, 17:45–18:00, H13
Permanent Damage in Reversible Cross-linked Fiber Bundles — •Huzaifa Shabbir1 and Markus Hartmann2 — 1Faculty of Physics, University of Vienna, Austria — 2Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of WGKK and AUVA Trauma Centre Meidling, Vienna, Austria
Cross-linking is a common strategy to tailor the mechanical properties of polymeric systems. In natural systems, these cross-links are usually weaker than covalent bonds, which helps to maintain the structural integrity of the system preventing permanent damage [1].
Addition of cross-links to a polymeric system shows positive effects on many mechanical parameters, recent computational studies on cross-linked fiber bundles showed the surprising result that weak cross-links may deteriorate the strength of these systems [2]. This effect is strongly dependent on the coordination of cross-links [3], being most pronounced for the classical case of two-fold coordinated cross-links, i.e. one additional bond connecting two monomers. This presentation will discuss in detail the influence of cross-link coordination on this effect. In particular, Monte Carlo simulations have been used to detect the onset of permanent damage, the corresponding work and strength as a function of cross-link density and coordination. The results clearly indicate that systems with cross-links of higher coordination are more damage tolerant than classical two-fold coordinated cross-links.
[1] Fantner et al., Biophys. J. 90, 1411 (2006) [2] Nabavi & Hartmann, Soft Matter 12, 2047 (2016) [3] Shabbir & Hartmann, New Journal of Physics 19, (2017)