Extending yield-stress fluid paradigms

Nelson, Arif Zainuddin

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https://hdl.handle.net/2142/88968 Copy

Description

Title

Extending yield-stress fluid paradigms

Author(s)

Nelson, Arif Zainuddin

Issue Date

2015-10-23

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

Ewoldt, Randy H

Department of Study

Mechanical Science & Engineering

Discipline

Mechanical Engineering

Degree Granting Institution

University of Illinois at Urbana-Champaign

Degree Name

M.S.

Degree Level

Thesis

Date of Ingest

2016-03-02T19:33:25Z

Keyword(s)

• Rheology
• Design
• Yield-Stress Fluid
• Bingham
• Extensibility
• Materials Selection
• Materials Synthesis

Abstract

In this thesis, we present two new paradigms for yield-stress fluids; the first organizes the existing understanding of the various ways to achieve a yield-stress fluid into a useful methodology for the design of rheologically complex materials; the second is based on the discrepancy in the behavior in extension of model yield-stress fluids versus application-relevant materials. Through implementation of material design principles of selection and synthesis, yield-stress fluid microstructures are organized according to the two known mechanical interactions capable of producing them (jamming and attraction). This rheology-to-structure inverse problem reveals trade-offs in designing yield-stress fluids, demonstrating that multiple material classes can achieve a target yield stress, providing the opportunity for creative design to achieve both the yield stress and other secondary design criteria. A secondary design criteria that is investigated in depth here is extensibility. We introduce a method for characterizing the extensibility of yield-stress fluids, demonstrate the extent to which existing model materials differ from the high extensibility seen in real yield-stress fluids (commercial products, biomaterials), and introduce an attempt at creating a model material for highly-extensible yield-stress fluids.

Graduation Semester

2015-12

Type of Resource

text

Permalink

http://hdl.handle.net/2142/88968

Copyright and License Information

Copyright 2015 Arif Nelson

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