Jaggi, Faculty Advisor, Narendra

Payne, Jason A.

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Illinois Wesleyan UniversityDigital Commons @ IWUJohn Wesley Powell Student ResearchConference 1993, 4th Annual JWP ConferenceMay 8th, 9:30 AM - 4:30 PMA Novel Technique for Studying the Shear ElasticResponse of Weak SolidsJason A. PayneIllinois Wesleyan UniversityNarendra Jaggi, Faculty AdvisorIllinois Wesleyan UniversityFollow this and additional works at: http://digitalcommons.iwu.edu/jwprcThis Event is brought to you for free and open access by The Ames Library, the Andrew W. Mellon Center for Curricular and FacultyDevelopment, the Office of the Provost and the Office of the President. It has been accepted for inclusion in Digital Commons @ IWU bythe faculty at Illinois Wesleyan University. For more information, please contact digitalcommons@iwu.edu.©Copyright is owned by the author of this document.Jason A. Payne and Narendra Jaggi, Faculty Advisor, "A Novel Technique for Studying the Shear Elastic Response of WeakSolids" (May 8, 1993). John Wesley Powell Student Research Conference. Paper 17.http://digitalcommons.iwu.edu/jwprc/1993/posters/17NOVEL TECHNIQUE FOR STUDYING SHEAR ELASTIC RESPONSE WEAK SOLIDS Jason Ao Payne, Department of Physics, IWU, Narendra Jaggi* Traditionany� the shear elastic properties of solids have been measured using mechanical instrumentation, Leo springs and balances. Commercially available instruments are designed to study engineering materials (steel for example) and are not useful for investigating weak solids, such as gels and e1ectrorheological fluids. We have developed a simple, inexpensive, and precise technique to measure the shear elastic modulus of weak solids using electromagnetic and optical tools. This technique can easily be adapted to measure the viscosity of a liquid alsoo A Helmholtz pair was used to produce a torque on a permanent magnet mounted on the smaner of two concentric cylinders, coupled by the material to be studiedo The torque was controlled precisely and measured accurately in terms of the current flowing through the coils of the Helmholtz pairo An optical lever was employed to measure the angular displacement of the inner cylinder as a function of the applied shear stresso The instrument has been validated by making measurements on lemon jello, and agarose gels of varying concentrations. The technique has also been applied to the study of electric field induced "freezing" of electrorheological fluids,. a subject of enormous contemporary interest. [This work is supported by a NASA/JOVE grant to the lllinois Wesleyan University Physics Department] 

A Novel Technique for Studying the Shear Elastic Response of Weak Solids

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A Novel Technique for Studying the Shear Elastic Response of Weak Solids

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