Paper Number
PO37 

Session
Poster Session

Title
Psychorheology through transient recovery rheology: Importance of timescales

Presentation Date and Time
October 13, 2021 (Wednesday) 6:30

Track / Room
Poster Session / Ballroom 1-2-3-4

Authors (Click on name to view author profile)

  1. Burgeson, Eric M. (University of Illinois, Chemical and Biomolecular Engineering)
  2. Martin, Jeffrey (Johnson & Johnson)
  3. Rogers, Simon A. (University of Illinois at Urbana-Champaign, Department of Chemical and Biomolecular Engineering)

Author and Affiliation Lines (in printed abstract book)
Eric M. Burgeson1, Jeffrey Martin2 and Simon A. Rogers1
1Chemical and Biomolecular Engineering, University of Illinois, Urbana, IL 61801; 2Johnson & Johnson, New Brunswick, NJ 08933

Speaker / Presenter 
Burgeson, Eric M.

Keywords
experimental methods; theoretical methods; applied rheology; non-Newtonian fluids; rheology methods

Text of Abstract
Consumer products such as food, cosmetics, toys, or other devices rely on having a viscoelastic behavior that is pleasant on the senses. However, the relation between the perception of soft materials and their physics, also known as psychorheology, is not well understood, and materials are often developed through trial-and-error rather than designed by rheology. In this work, recovery rheology is used via a series of creep and recovery tests to decompose measured strains into a recoverable and unrecoverable component. These tests allow us to build a transient view of traditional rheological metrics. The metrics are tracked with respect to two independent time axes – a creep time and a recovery time. Instantaneous material properties are examined and found to rapidly change at short times, suggesting that timescales are the most important aspect of human perception. The methods in this work provide a basis for finding relevant psychorheological measures, in contrast with typically used steady-state measures that are often inadequate in capturing the realities of perception.