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Kinetics of thermally induced swelling of hydrogels

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Title: Kinetics of thermally induced swelling of hydrogels
Author(s): Ji, Huidi; Mourad, Hashem; Fried, Eliot; Dolbow, John E.
Abstract: We present a continuum model for thermally-induced volume transitions in stimulus-responsive hydrogels (SRHs). The framework considers the transition as driven through the motion of a sharp interface separating swollen and collapsed phases of the underlying polymer network. In addition to bulk and interfacial force and energy balances, our model considers an interfacial normal configurational force balance. To account for the large volume changes exhibited by SRHs during actuation, the governing equations are developed in the setting of finite-strain kinematics. The numerical approximations to the coupled thermomechanical equations are obtained with an extended finite element/level-set method. The solution strategy involves a non-standard operator split and a simplified version of the level-set update. A number of representative problems are considered to investigate the model and compare its predictions to experimental observations. In particular, we consider the thermally-induced swelling of spherical and cylindrical specimens. The stability of the interface evolution is also examined.
Issue Date: 2004-12
Publisher: Department of Theoretical and Applied Mechanics (UIUC)
Series/Report: TAM Reports 1055, (2004)
Genre: Technical Report
Type: Text
Language: English
ISSN: 0073-5264
Publication Status: published or submitted for publication
Peer Reviewed: is peer reviewed
Date Available in IDEALS: 2007-03-09
Is Version Of: Published as: Huidi Ji, Hashem Mourad, Eliot Fried and John Dolbow. International Journal of Solids and Structures, Vol. 43, No. 7-8, 2006, pp 1878-1907. DOI: 10.1016/j.ijsolstr.2005.03.031. Copyright 2006 Elsevier Ltd.

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  • Theoretical and Applied Mechanics (TAM) Technical Reports
    TAM technical reports include manuscripts intended for publication, theses judged to have general interest, notes prepared for short courses, symposia compiled from outstanding undergraduate projects, and reports prepared for research-sponsoring agencies.

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