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Constitutive modelling of composite biopolymer networks
Royal Institute of Technology, (KTH).
Royal Institute of Technology, (KTH).
2016 (English)In: Journal of Theoretical Biology, ISSN 0022-5193, E-ISSN 1095-8541, Vol. 395, 51-61 p.Article in journal (Refereed) Published
Abstract [en]

The mechanical behaviour of biopolymer networks is to a large extent determined at a microstructural level where the characteristics of individual filaments and the interactions between them determine the response at a macroscopic level. Phenomena such as viscoelasticity and strain-hardening followed by strain-softening are observed experimentally in these networks, often due to microstructural changes (such as filament sliding, rupture and cross-link debonding). Further, composite structures can also be formed with vastly different mechanical properties as compared to the individual networks. In this present paper, we present a constitutive model presented in a continuum framework aimed at capturing these effects. Special care is taken to formulate thermodynamically consistent evolution laws for dissipative effects. This model, incorporating possible anisotropic network properties, is based on a strain energy function, split into an isochoric and a volumetric part. Generalisation to three dimensions is performed by numerical integration over the unit sphere. Model predictions indicate that the constitutive model is well able to predict the elastic and viscoelastic response of biological networks, and to an extent also composite structures.

Place, publisher, year, edition, pages
2016. Vol. 395, 51-61 p.
National Category
Other Medical Engineering Composite Science and Engineering
Research subject
Technology (byts ev till Engineering), Mechanical Engineering
Identifiers
URN: urn:nbn:se:lnu:diva-58923DOI: 10.1016/j.jtbi.2016.01.034OAI: oai:DiVA.org:lnu-58923DiVA: diva2:1055025
Available from: 2016-12-09 Created: 2016-12-09 Last updated: 2016-12-19Bibliographically approved

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Citation style
  • apa
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  • Other locale
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