Mathieu Joanicot
Thèse soutenue le 24 avril 1984
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Elasticité, plasticité et fusion des cristaux calloïdaux sous cisaillement
Elasticity of polycrystalline samples
M. Joanicot, M. Jorand, P. Pieranski and F. Rothen
„Shear-waves in colloidal crystals .2. Effects of finite height in cylindrical samples“
J. de Phys. 45 (1984) 1413
Principle of measurements of the shear elastic modulus of colloidal crystals. Shear deformation tilts crystal planes and deforms the corresponding Kossel line. The sensitive area of the photodiode is located at the edge of the Kossel line. Due to the finite height of the sample, eigenmodes of the shear deformation of the colloidal crystal depend on two variables: the radius r and the height z.
Amplitude of oscillations of the Kossel line detected by the photodiode plotted versus the frequency of oscillations. Resonances correspond to shear eigenmodes of the cylindrical sample of finite height with the ratio R/H=0.58.
Variation of the frequency of eigenmodes with the aspect ratio R/H. Theoretical prediction.
Taylor instability and
melting of colloidal crystals in a plastic shear deformation
M. Joanicot and P. Pieranski.
"Taylor instabilities in colloidal crystals."
Journal de Physique Lettres 46, no. 3 (1985) 91-96.
Setup for application of a plastic shear deformation.
Taylor instability
(side view)
Bragg reflections of light from randomly oriented crystals in a polycrystalline sample (top view).
Bragg reflections of light from crystallites oriented by a plastic shear deformation (top view).
Melting of crystallites in a large enough shear rate (top view).
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