Abstract

AbstractWe propose and study methods to improve tactile intuition for linear viscoelastic fluids. This includes (i) Pipkin mapping with amplitude based on stress rather than strain or strain-rate to map perception to rheological test conditions; and (ii) data reduction of linear viscoelastic functions to generate multi-dimensional Ashby-style cross-property plots. Two model materials are used, specifically chosen to be easily accessible and safe to handle, with variable elastic, viscous, and relaxation time distributions. First, a commercially available polymer melt known as physical therapy putty, reminiscent of Silly Putty, designed for a range of user experiences (extra-soft to extra-firm). Second, a transiently cross-linked aqueous polymer solution (Polyvinyl alcohol-Sodium Tetraborate, PVA-Borax). Readers are encouraged to procure or produce the samples themselves to build intuition. The methods studied here reduce the complexity of the function-valued viscoelastic data, identifying what key features we sense and see when handling these materials, and provide a framework for tactile intuition, material selection, and material design for linear viscoelastic fluids generally.

Highlights

  • Intuition with viscoelastic materials is central to integrating them into the design toolbox

  • We propose and study methods to improve tactile intuition for linear viscoelastic fluids

  • The methods studied here reduce the complexity of the function-valued viscoelastic data, identifying what key features we sense and see when handling these materials, and provide a framework for tactile intuition, material selection, and material design for linear viscoelastic fluids generally

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Summary

Introduction

Intuition with viscoelastic materials is central to integrating them into the design toolbox. Engineering design with elastic solids and Newtonian fluids is well established, as. Even at a basic level, design with these materials is a high-dimensional problem (e.g. cross-property Ashby Diagrams would require either more dimensions or lower-dimensional descriptions [12, 32, 38,39,40]). The viscoelastic character of the putties implies that the materials have complex, function-valued properties.

11 MPa gummy bear gel insole
Design & Inverse Problems
Engineering design and the role of intuition
Materials Selection for Design
Continuous relaxation spectra and viscoelastic constants
Materials
PVA-Borax
Rheometry
Pipkin Mapping of Perception-to-Rheology
Stress-Amplitude Pipkin Space
Co-location of rheological characterization
Step-input Experiments
Rheology of PVA-Borax
Data reduction for intuition and
Relaxation timescale dispersity
Ashby-style mapping and discussion
Conclusions
A Appendix
What rheological test would measure this?

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