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Indentation method for measuring the viscoelastic kernel function of nonlinear viscoelastic soft materials

Published online by Cambridge University Press:  08 February 2013

Yan-Ping Cao ,
Man-Gong Zhang  and
Xi-Qiao Feng
Yan-Ping Cao*
Affiliation:
AML & CMM, Institute of Biomechanics and Medical Engineering, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China
Man-Gong Zhang
Affiliation:
AML & CMM, Institute of Biomechanics and Medical Engineering, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China
Xi-Qiao Feng
Affiliation:
AML & CMM, Institute of Biomechanics and Medical Engineering, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China
*
a)Address all correspondence to this author. e-mail: caoyanping@tsinghua.edu.cn
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Abstract

The indentation method of nonlinear viscoelastic materials is investigated through combined numerical and experimental efforts to reveal the correlation between the viscoelastic kernel function and the indentation responses. It is shown that the viscoelastic kernel function of a nonlinear viscoelastic solid with viscous response characterized by a linear rate constitutive equation scales with the normalized relaxation load in an indentation relaxation test. This scaling relation does not depend on the geometry of the indented solid and the profile of the indenter. Therefore, it may serve as a fundamental relation for characterizing the viscoelastic properties of some biological soft tissues and artificial soft materials with regular/irregular surface morphology.

Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 6 , 28 March 2013 , pp. 806 - 816
Copyright
Copyright © Materials Research Society 2013

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