Capturing strain stiffening using Volume Controlled Cavity Expansion
Author(s)Raayai Ardakani, Shabnam; Cohen, Tal
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Strain-stiffening is a well-documented behavior in soft biological materials such as liver and brain tissue. Measuring and characterizing this nonlinear response, which is commonly considered as a mechanism for damage prevention, is of great interest to engineers for design of better biomimetic materials, and to physicians for diagnostic purposes. However, probing the elastic response of soft or biological materials at large deformation in their natural habitat, is an arduous task. Here, we present the Volume Controlled Cavity Expansion (VCCE) technique as a measurement method that offers the ability of characterizing the local stiffening response of materials in addition to identifying their shear modulus. By employing minimal constitutive representations involving only two constants (Mooney–Rivlin, Gent, and Ogden) we show that for the conventional PDMS samples, this technique and an accompanying data analysis method capture the shear modulus, as well as providing reliable measures of the stiffening behavior of the samples.
DepartmentMassachusetts Institute of Technology. Department of Mechanical Engineering; Massachusetts Institute of Technology. Department of Civil and Environmental Engineering
Extreme Mechanics Letters
Raayai-Ardakani, Shabnam, and Tal Cohen. "Capturing strain stiffening using Volume Controlled Cavity Expansion." Extreme Mechanics Letters, 31 (September 2019): 100536