Rheological Behavior of Gelatin at High Shear Rates
Author | : Jiwoon Kwon |
Publisher | : |
Total Pages | : |
Release | : 2010 |
ISBN-10 | : OCLC:769020224 |
ISBN-13 | : |
Rating | : 4/5 (24 Downloads) |
Book excerpt: The model has been applied to experimental observations on double lap-shear test fixture with gelatin specimen subjected to high velocity input on the inner surface. This test fixture allows visualization of momentum diffusion through gelatin (when imaged by a high-speed camera) and measurement of shear stress on the outer surface. The parameters in the power-law model can be extracted using two methods: (i) the measured velocity of striking plate and the transferred stress through gelatin to the stationary plate, and (ii) the time resolved images of unsteady deformation of gelatin and the self-similar solution. The power in this model was found to be 2.2 from first method and 2.25 from the second method. The results from both methods show a good agreement. This power value implies that gelatin is highly rate sensitive material and its behavior can be modeled as a strong shear-thickening fluid. The above results are useful in computational models of human tissue deformation when subjected to high velocity or high strain rate loading. Determination of properties and constitutive behavior of surrogate materials facilitates progress in computational model development relating to TBI and other biomedical applications. The suggested future work includes development of a constitutive model for intermediate shear rate regime and the determination for viscoelastic contribution under high shear rate loading. In addition, it is proposed that a similar technique can be utilized on other rheological fluids to determine their properties.