Design tools for linear viscoelastic fluids

Corman, Rebecca E.

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https://hdl.handle.net/2142/105817 Copy

Description

Title

Design tools for linear viscoelastic fluids

Author(s)

Corman, Rebecca E.

Issue Date

2019-07-12

Director of Research (if dissertation) or Advisor (if thesis)

Ewoldt, Randy H

Doctoral Committee Chair(s)

Ewoldt, Randy H

Committee Member(s)

• Allison, James T
• Sottos, Nancy R
• Nettesheim, Florian

Department of Study

Mechanical Sci & Engineering

Discipline

Mechanical Engineering

Degree Granting Institution

University of Illinois at Urbana-Champaign

Degree Name

Ph.D.

Degree Level

Dissertation

Keyword(s)

Viscoelasticity, complex fluids, viscoelastic, viscoelastic fluids, design, optimization, materials, materials design, fluid mechanics

Abstract

Engineering design often makes use of conventional materials such as hard, elastic solids and simple, Newtonian fluids. Rheologically-complex materials (non-Newtonian fluids and soft solids) demonstrate useful and novel properties in both engineered and biological systems. Incorporating these materials in rational engineering design stands to vastly enhance the design space and allow for improvements in technology in areas including vibration isolation, 3D printing, soft robotics, energy storage, adhesion, and coatings. To date, most work in the space of materials and design has focused on characterization of novel materials, material selection, material processing optimization, or material processing optimization. Thus making use of materials with novel functionality often occurs through trial and error or kismet of matching a new material to a novel use. To truly utilize rheologically complex materials, we must use a rational design process. In this thesis, we build up the necessary foundations for utilizing a sub-class of rheologically-complex materials – materials that exhibit linear viscoelastic behavior – for design. This work develops the framework necessary to incorporate linear viscoelastic materials into the designer's toolbox. First, we think deeply about ways to describe linear viscoelastic behavior for development of intuition for these materials and for rational design. We make extensive use of the continuous relaxation spectra description of the material response $H(\tau)$ an important design-appropriate material description to define low-dimensional material descriptions. We use these material descriptions to build cross-property Ashby-style diagrams that incorporate information about the complex-function valued material response in a compact and accessible format. Next we develop the mathematical framework for rational design and computational optimization with linear viscoelastic materials. This framework is applied to multiple vibration isolation design scenarios. In this work, we have built the framework to vastly expand the material design space and allow for improvements in technology in areas including vibration isolation, 3D printing, soft robotics, energy storage, and adhesion.

Graduation Semester

2019-08

Type of Resource

text

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http://hdl.handle.net/2142/105817

Copyright and License Information

Copyright 2019 Rebecca Corman

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