(513a) Experimental Decomposition of the Rheological Responses of Elastoviscoplastic Materials
AIChE Annual Meeting
2019 AIChE Annual Meeting
Engineering Sciences and Fundamentals
Wednesday, November 13, 2019 - 12:30pm to 12:45pm
The stress jump tests separate stress acquired through elastic and inelastic processes and show that nearly all the stress in the Carbopol system is elastic. The shear/recovery tests, by contrast, allow for recoverable and unrecoverable strains to be resolved, and show that when above the yield point, both of these components contribute significantly to the overall materials response. We utilize the interplay between these two strain components to develop a more comprehensive rheological picture of yielding in soft materials. These results suggest that any numerical decompositions for yield stress materials need to consider the existence of both unrecoverable viscoplastic flow above the yield point and a recoverable strain which persists once yielding has taken place.