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oai:www.ideals.illinois.edu:2142/88968 2023-07-11 col_2142_5131 col_2142_14787 com_2142_5130 com_2142_9630 com_2142_234

Ewoldt, Randy H Nelson, Arif Zainuddin 2016-03-02T19:33:25Z 2016-03-02T19:33:25Z 2015-10-23 2015-12 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. Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2016-03-02 without embargo terms The student, Arif Nelson, accepted the attached license on 2015-10-21 at 16:01. The student, Arif Nelson, submitted this Thesis for approval on 2015-10-21 at 16:10. This Thesis was approved for publication on 2015-10-23 at 16:28. DSpace SAF Submission Ingestion Package generated from Vireo submission #8734 on 2016-03-02 at 12:49:40 Made available in DSpace on 2016-03-02T19:33:25Z (GMT). No. of bitstreams: 2 NELSON-THESIS-2015.pdf: 4181117 bytes, checksum: 17a1ba23962bed830da15d26dc0934c8 (MD5) LICENSE.txt: 4208 bytes, checksum: 44f6648dca88490c65970a71d6bb4cc4 (MD5) Previous issue date: 2015-10-23 application/pdf http://hdl.handle.net/2142/88968 en Copyright 2015 Arif Nelson Rheology Design Yield-Stress Fluid Bingham Extensibility Materials Selection Materials Synthesis Extending yield-stress fluid paradigms text text Mechanical Science & Engineering Mechanical Engineering University of Illinois at Urbana-Champaign Thesis M.S.