Load transfer between permanent and dynamic networks due to stress gradients in nonlinear viscoelastic hydrogels

Wang, Jikun; Cui, Kunpeng; Zhu, Bangguo; Gong, Jian Ping; Hui, Chung-Yuen; Zehnder, Alan T

doi:10.1016/j.eml.2022.101928


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Load transfer between permanent and dynamic networks due to stress gradients in nonlinear viscoelastic hydrogels

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Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/92515

Title:	Load transfer between permanent and dynamic networks due to stress gradients in nonlinear viscoelastic hydrogels
Authors:	Wang, Jikun Browse this author
	Cui, Kunpeng Browse this author →KAKEN DB
	Zhu, Bangguo Browse this author
	Gong, Jian Ping Browse this author →KAKEN DB
	Hui, Chung-Yuen Browse this author
	Zehnder, Alan T Browse this author
Keywords:	Dynamic bonds
	Chemical bonds
	Physical bonds
	Image correlation
	Viscoelasticity
	Crack
Issue Date:	Jan-2023
Publisher:	Elsevier
Journal Title:	Extreme Mechanics Letters
Volume:	58
Start Page:	101928
Publisher DOI:	10.1016/j.eml.2022.101928
Abstract:	Relaxation experiments are performed on single edge notch tension (SENT) and T shape specimens consisting of different variations of polyampholyte (PA) hydrogels. These specimens share a common feature of containing regions of high and low stress/strain. This feature enables us to probe the load transfer mechanisms between permanent and dynamic networks of different strengths. This load transfer mechanism is connected to viscoelastic behavior. PA gels are nonlinear viscoelastic, with time-dependent behavior controlled by the breaking and reforming of ionic bonds in the dynamic network. In contrast to the prediction of linear viscoelastic theory, the displacement and strain fields during stress relaxation are not fixed but change with time in a complex way depending on the strength of the dynamic bonds and the observation time window. These experimental results are explained by a nonlinear viscoelastic model. Additional physical insights are gained by appealing to the nonlinear rheology of dynamic bonds or stickers. Our result shows that load transfer between networks can be controlled by modifying the strength of dynamic bonds.
Rights:	©2023. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Rights:	http://creativecommons.org/licenses/by-nc-nd/4.0/
Type:	article (author version)
URI:	http://hdl.handle.net/2115/92515
Appears in Collections:	生命科学院・先端生命科学研究院 (Graduate School of Life Science / Faculty of Advanced Life Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 龔剣萍 (Gong Jian Ping)

OAI-PMH ( junii2 , jpcoar_1.0 )

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