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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/20488

Title: Effect of microstructure on anomalous strain-rate-dependent behaviour of bacterial cellulose hydrogel
Authors: Gao, Xing
Shi, Zhijun
Lau, Andrew
Liu, Changqing
Yang, Guang
Silberschmidt, Vadim V.
Keywords: Strain-rate softening
Deformation mechanisms
Microstructural changes
In-aqua testing
Bacterial cellulose hydrogel
Issue Date: 2016
Publisher: © Elsevier
Citation: GAO, X. ...et al., 2016. Effect of microstructure on anomalous strain-rate-dependent behaviour of bacterial cellulose hydrogel. Materials Science and Engineering C, 62, pp. 130-136.
Abstract: This study is focused on anomalous strain-rate-dependent behaviour of bacterial cellulose (BC) hydrogel that can be strain-rate insensitive, hardening, softening, or strain-rate insensitive in various ranges of strain rate. BC hydrogel consists of randomly distributed nanofibres and a large content of free water; thanks to its ideal biocompatibility, it is suitable for biomedical applications. Motivated by its potential applications in complex loading conditions of body environment, its time-dependent behaviour was studied by means of in-aqua uniaxial tension tests at constant temperature of 37 °C at various strain rates ranging from 0.0001 s- 1 to 0.3 s- 1. Experimental results reflect anomalous strain-rate-dependent behaviour that was not documented before. Micro-morphological observations allowed identification of deformation mechanisms at low and high strain rates in relation to microstructural changes. Unlike strain-rate softening behaviours in other materials, reorientation of nanofibres and kinematics of free-water flow dominate the softening behaviour of BC hydrogel at high strain rates.
Description: This paper was accepted for publication in the journal Materials Science and Engineering C and the definitive published version is available at http://dx.doi.org/10.1016/j.msec.2016.01.042.
Sponsor: The authors would like to acknowledge the 7th European Community Framework Programme for financial support through a Marie Curie International Research Staff Exchange Scheme (IRSES) Project entitled “Micro-Multi-Material Manufacture to Enable Multifunctional Miniaturised Devices (M6)” (Grant No. PIRSES-GA-2010-269113). Additional support from China-European Union technology cooperation programme (Grant No. 1110) is also acknowledged.
Version: Accepted for publication
DOI: 10.1016/j.msec.2016.01.042
URI: https://dspace.lboro.ac.uk/2134/20488
Publisher Link: http://dx.doi.org/10.1016/j.msec.2016.01.042
ISSN: 0928-4931
Appears in Collections:Published Articles (Mechanical, Electrical and Manufacturing Engineering)

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