Abstract
Finite deformation, viscoelastic constitutive characterization of hydrogels is of particular importance across a spectrum of engineering and medical applications. Due to its ease of fabrication, tissue mimicking optical and physical properties, agarose hydrogels are among the most widely used phantom gels, yet their dynamic, high strain rate nonlinear constitutive properties have remained largely undocumented. To address this knowledge gap and to constitutively characterize the nonlinear viscoelastic behavior of agarose hydrogels of varying concentration at ballistic to ultra-high strain-rates (103-108s−1), we employ our recently developed Inertial Microcavitation Rheometry (IMR) technique. Using IMR, we find a noticeable transition in the constitutive properties as the concentration of agarose increases beyond 2.5%, which is reflected by a significant change in the underlying agarose gel microstructure and consistent with previous literature reports. In addition, we observe the development and evolution of concentration-dependent, fractal-like surface instabilities during inertial cavitation.
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