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- W1540393063 abstract "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 be easily adapted to measure the viscosity of a liquid also. A Helmholtz pair was used to produce a torque on a pennanent magnet mounted on the smaller of two concentric cylinders, coupled by the material to be studied. The torque was controlled precisely and measured accurately in tenns of the current flowing through the coils of the Helmholtz pair. An optical lever was employed to measure the angular displacement of the inner cylinder as a function of the applied shear stress. 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 enonnous contemporary interest. Introduction Traditionally, the shear elastic properties of solids have been measured using mechanical instrumentation. The material under study is typically grabbed and then twisted or stretched. The angular displacement, or change in length, is then measured by either mechanical or electronic methods. Results of such measurements are frequently presented as stress-strain ('t-y) graphs, where 't denotes the shear stress and y represents the shear strain (Figure 1). A solid typically behaves linearly over a finite region of stresses and eventually moves into a non-linear regime. This non-linear behavior terminates when the material fails." @default.
- W1540393063 created "2016-06-24" @default.
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- W1540393063 date "1993-01-01" @default.
- W1540393063 modified "2023-09-27" @default.
- W1540393063 title "A Novel Technique for Studying the Shear Elastic Properties of Weak Solids" @default.
- W1540393063 hasPublicationYear "1993" @default.
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