Deformation and fracture of echinoderm collagen networks

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• 作者：Markus Ovaska^a ; Zsolt Bertalan^b ; Amandine Miksic^a ; Michela Sugni^c ; ^d ; Cristiano Di Benedetto^c ; Cinzia Ferrario^c ; Livio Leggio^c ; Luca Guidetti^c ; ^d ; Mikko J. Alava^a ; Caterina A.M. La Porta^c ; ^d ; ^{caterina.laporta@unimi.it} ; Stefano Zapperi^d ; ^e ; ^b ; ^f ; ^a ; ^{stefano.zapperi@unimi.it}
• 关键词：Collagen networks ; Echinoderms ; Elasticity ; Fracture ; Computational model
• 刊名：Journal of the Mechanical Behavior of Biomedical Materials
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：65
• 期：Complete
• 页码：42-52
• 全文大小：5599 K
• 卷排序：65

文摘

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.