Paper Number
PF10 

Session
Applied Rheology for Pharmaceuticals, Food and Consumer Products

Title
Teaching thixotropy and elastoviscoplastic materials

Presentation Date and Time
October 13, 2022 (Thursday) 9:45

Track / Room
Track 2 / Mayfair

Authors (Click on name to view author profile)

  1. Macosko, Christopher W. (University of Minnesota, Chemical Engineering and Materials Science)
  2. Ewoldt, Randy H. (University of Illinois at Urbana-Champaign, Mechanical Science and Engineering)
  3. McKinley, Gareth H. (Massachusetts Institute of Technology, Mechanical Engineering)

Author and Affiliation Lines (in printed abstract book)
Christopher W. Macosko1, Randy H. Ewoldt2 and Gareth H. McKinley3
1Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455; 2Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801; 3Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02142

Speaker / Presenter 
Macosko, Christopher W.

Keywords
additive manufacturing; biomaterials; colloids; consumer products; emulsions; foams; food rheology; gels; glasses; jammed systems; soil rheology; surfactants; suspensions

Text of Abstract
There is a resurgence of interest in understanding and modeling the complex and nonlinear response of materials such as soft solid foods, pastes, hydrogels and 3D printable feedstocks. In such systems one needs to describe not only the linear viscoelastic rheology below a critical stress or yield point, but also the nonlinear properties as the system fluidizes, yields and ultimately flows. In such systems thixotropic responses are also very common, and in the most general case we thus seek to understand the key features of what we refer to as Thixotropic Elastoviscoplastic (TEVP) Materials. What are the canonical signatures of such systems? How should we distill the vast complexity of observations and approaches to compactly teach students and industrial practitioners? What are the key features they need to measure and describe? For our presentation we envision a short (~10min) introduction and motivation to set the stage followed by an open discussion and airing of different views, insights and experience in teaching these topics, that we will help guide and moderate.