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OSCILLATING VANE GEOMETRY FOR SOFT SOLID GELS AND FOAMS
Author(s) -
SERVAIS C.,
RAVJI S.,
SANSONNENS C.,
BAUWENS I.
Publication year - 2002
Publication title -
journal of texture studies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.593
H-Index - 54
eISSN - 1745-4603
pISSN - 0022-4901
DOI - 10.1111/j.1745-4603.2002.tb01363.x
Subject(s) - concentric , materials science , viscoelasticity , shear stress , composite material , stress (linguistics) , mechanics , torque , slip (aerodynamics) , stress–strain curve , shear (geology) , geometry , deformation (meteorology) , mathematics , physics , thermodynamics , linguistics , philosophy
Several relationships between the torque and the stress exist for the vane geometry, but only a few equations have been proposed for the relationship between angular displacement and strain. In this study, an expression based on the infinite gap approximation for concentric cylinders is used and well‐defined reference data are compared to oscillating vane data to validate the assumptions used. Gelatin gels are used for their property to stick to the wall and carrageenan gels are used to show that wall slip does not occur with oscillating vanes in serrated cup geometries. Shaving foams are used as a model low density, time and shear stable foam, which resists irreversible damage when loaded between serrated parallel plates. Results show that the assumptions used for the determination of stress and strain with the vane provide material viscoelastic properties that are not significantly different from reference values as obtained with concentric cylinders and parallel plates.