TY - JOUR
T1 - A simplified model for equilibrium and transient swelling of thermo-responsive gels
AU - Drozdov, A. D.
AU - Christiansen, Jesper de Claville
PY - 2017/11/1
Y1 - 2017/11/1
N2 - A simplified model is developed for the elastic response of thermo-responsive gels subjected to swelling under an arbitrary deformation with finite strains. The constitutive equations involve five adjustable parameters that are determined by fitting observations in equilibrium water uptake tests and T-jump transient tests on thin gel disks. Two scenarios for water release under heating are revealed by means of numerical simulation. When the final temperature in a T-jump test is below the volume-phase transition temperature, deswelling is characterized by smooth distribution of water molecules and small tensile stresses. When the final temperature exceeds the critical temperature, a gel disk is split into three regions (central part with a high concentration of water molecules and two domains near the boundaries with low water content) separated by sharp interfaces, whose propagation is accompanied by development of large (comparable with the elastic modulus) tensile stresses.
AB - A simplified model is developed for the elastic response of thermo-responsive gels subjected to swelling under an arbitrary deformation with finite strains. The constitutive equations involve five adjustable parameters that are determined by fitting observations in equilibrium water uptake tests and T-jump transient tests on thin gel disks. Two scenarios for water release under heating are revealed by means of numerical simulation. When the final temperature in a T-jump test is below the volume-phase transition temperature, deswelling is characterized by smooth distribution of water molecules and small tensile stresses. When the final temperature exceeds the critical temperature, a gel disk is split into three regions (central part with a high concentration of water molecules and two domains near the boundaries with low water content) separated by sharp interfaces, whose propagation is accompanied by development of large (comparable with the elastic modulus) tensile stresses.
KW - Modeling
KW - Thermo-responsive gel
KW - Transient swelling
KW - Volume phase transition
UR - http://www.scopus.com/inward/record.url?scp=85021719712&partnerID=8YFLogxK
U2 - 10.1016/j.jmbbm.2017.06.034
DO - 10.1016/j.jmbbm.2017.06.034
M3 - Journal article
AN - SCOPUS:85021719712
SN - 1751-6161
VL - 75
SP - 20
EP - 32
JO - Journal of the Mechanical Behavior of Biomedical Materials
JF - Journal of the Mechanical Behavior of Biomedical Materials
ER -