Deformation and fracture of echinoderm collagen networks.

Autor: Ovaska M; Department of Applied Physics, Aalto University, P.O. Box 11100, FIN-00076 Aalto, Espoo, Finland., Bertalan Z; Institute for Scientific Interchange Foundation, Via Alassio 11/C, 10126 Torino, Italy., Miksic A; Department of Applied Physics, Aalto University, P.O. Box 11100, FIN-00076 Aalto, Espoo, Finland., Sugni M; Department of Biosciences, University of Milan, via Celoria 26, 20133 Milano, Italy; Center for Complexity and Biosystems, University of Milan, via Celoria 16, 20133 Milano, Italy., Di Benedetto C; Department of Biosciences, University of Milan, via Celoria 26, 20133 Milano, Italy., Ferrario C; Department of Biosciences, University of Milan, via Celoria 26, 20133 Milano, Italy., Leggio L; Department of Biosciences, University of Milan, via Celoria 26, 20133 Milano, Italy., Guidetti L; Department of Biosciences, University of Milan, via Celoria 26, 20133 Milano, Italy; Center for Complexity and Biosystems, University of Milan, via Celoria 16, 20133 Milano, Italy., Alava MJ; Department of Applied Physics, Aalto University, P.O. Box 11100, FIN-00076 Aalto, Espoo, Finland., La Porta CAM; Department of Biosciences, University of Milan, via Celoria 26, 20133 Milano, Italy; Center for Complexity and Biosystems, University of Milan, via Celoria 16, 20133 Milano, Italy. Electronic address: caterina.laporta@unimi.it., Zapperi S; Center for Complexity and Biosystems, University of Milan, via Celoria 16, 20133 Milano, Italy; Department of Physics, University of Milan, via Celoria 16, 20133 Milano, Italy; Institute for Scientific Interchange Foundation, Via Alassio 11/C, 10126 Torino, Italy; CNR - Consiglio Nazionale delle Ricerche, Istituto per l׳Energetica e le Interfasi, Via R. Cozzi 53, 20125 Milano, Italy; Department of Applied Physics, Aalto University, P.O. Box 11100, FIN-00076 Aalto, Espoo, Finland. Electronic address: stefano.zapperi@unimi.it.
Jazyk: angličtina
Zdroj: Journal of the mechanical behavior of biomedical materials [J Mech Behav Biomed Mater] 2017 Jan; Vol. 65, pp. 42-52. Date of Electronic Publication: 2016 Aug 05.
DOI: 10.1016/j.jmbbm.2016.07.035
Abstrakt: Collagen networks provide the main structural component of most tissues and represent an important ingredient for bio-mimetic materials for bio-medical applications. Here we study the mechanical properties of stiff collagen networks derived from three different echinoderms and show that they exhibit non-linear stiffening followed by brittle fracture. The disordered nature of the network leads to strong sample-to-sample fluctuations in elasticity and fracture strength. We perform numerical simulations of a three dimensional model for the deformation of a cross-linked elastic fibril network which is able to reproduce the macroscopic features of the experimental results and provide insights into the internal mechanics of stiff collagen networks. Our numerical model provides an avenue for the design of collagen membranes with tunable mechanical properties.
(Copyright © 2016 The Authors. Published by Elsevier Ltd.. All rights reserved.)
Databáze: MEDLINE
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