We have studied the shear impedance of two smectics-A when the propagation of the shear wave is along the normal to the layers. We observed that the real part and the imaginary part of the shear impedance differ significantly, indicating a relaxation process. We analysed our results on the basis of a coupling between the director fluctuations and the shear flow.Nous avons étudié le comportement de deux smectiques-A soumis à une contrainte de cisaillement ultrasonore dans le cas où le vecteur d'onde est parallèle à la normale aux couches. Nous avons mis en évidence un processus de relaxation que nous discutons en supposant l'existence d'un couplage entre les fluctuations du directeur et l'écoulement local
Smectic systems are characterized by a lamellar ordering of more or less liquid layers. Mechanically...
We report a detailed study of the shear mechanical impedance near the crystalline-B-smectic-A transi...
We present a detailed analysis of anharmonic effects on the viscous and elastic properties of variou...
The behaviour of a smectic B phase (BBOA) has been investigated by means of shear wave reflectance t...
Results of theoretical investigations into the behaviour of a shear wave at the boundary between an ...
We have observed the transmission of ultrasonic shear waves at 110 MHz in smectic BA, BC and EA phas...
This paper considers the onset of a shear-induced instability in a sample of smectic A liquid crysta...
We study the undulation instability in a smectic A in the presence of shear flow parallel to the lay...
We compute the coupled flow and elastic distortion of an ideal smectic A liquid crystal normally squ...
The nonlinear coupling between the velocity field and the layer-displacement field leads to a radica...
A study of anharmonic effects in the presence of shear flow in the liquid layers of smectic-A, hexat...
We present and discuss experimental results on the behaviour of a smectic A placed in a parallel con...
A numerical and analytical analysis of shear-induced melting in smectic-A liquid crystals is present...
We measure the apparent bulk modulus corresponding to the layer compression of a SA liquid crystal, ...
We give a theoretical analysis of the instabilities which occur in a smectic A sample, when submitte...
Smectic systems are characterized by a lamellar ordering of more or less liquid layers. Mechanically...
We report a detailed study of the shear mechanical impedance near the crystalline-B-smectic-A transi...
We present a detailed analysis of anharmonic effects on the viscous and elastic properties of variou...
The behaviour of a smectic B phase (BBOA) has been investigated by means of shear wave reflectance t...
Results of theoretical investigations into the behaviour of a shear wave at the boundary between an ...
We have observed the transmission of ultrasonic shear waves at 110 MHz in smectic BA, BC and EA phas...
This paper considers the onset of a shear-induced instability in a sample of smectic A liquid crysta...
We study the undulation instability in a smectic A in the presence of shear flow parallel to the lay...
We compute the coupled flow and elastic distortion of an ideal smectic A liquid crystal normally squ...
The nonlinear coupling between the velocity field and the layer-displacement field leads to a radica...
A study of anharmonic effects in the presence of shear flow in the liquid layers of smectic-A, hexat...
We present and discuss experimental results on the behaviour of a smectic A placed in a parallel con...
A numerical and analytical analysis of shear-induced melting in smectic-A liquid crystals is present...
We measure the apparent bulk modulus corresponding to the layer compression of a SA liquid crystal, ...
We give a theoretical analysis of the instabilities which occur in a smectic A sample, when submitte...
Smectic systems are characterized by a lamellar ordering of more or less liquid layers. Mechanically...
We report a detailed study of the shear mechanical impedance near the crystalline-B-smectic-A transi...
We present a detailed analysis of anharmonic effects on the viscous and elastic properties of variou...