Measuring the yield stress in magnetorheological fluids using ultrasounds

Jaime Rodriguez-Lopez (1) , Luis Elvira (2) , Francisco Montero de Espinosa Freijo (2) , Georges Bossis (3) , Juan de Vicente (4)

1 Centre of Applied Physics and Non Destructive Evaluation. (CAEND-CSIC
2 Centre of Applied Physics and Non Destructive Evaluation. (CAEND-CSIC
3 LPMC - Laboratoire de physique de la matière condensée
4 Department of Applied Physics

In this work, we propose a new method to accurately determine the yield stress in magnetorheological (MR) fluids using ultrasounds. The setup is constructed and experimental data are obtained on a model conventional MR fluid under steady shear stress ramp-up tests. By using video-microscopy, ultrasonic techniques and rheometry, simultaneously, it is possible to precisely determine the yield stress at experimentally accessible times.

Mots clés: Magnetorheology; magnetorheological fluids; yield stress; ultrasounds

Domaines: Science des matériaux [cond-mat.mtrl-sci]; Matière Molle [cond-mat.soft]

Jaime Rodriguez-Lopez, Luis Elvira, Francisco Montero de Espinosa Freijo, Georges Bossis, Juan de Vicente. Measuring the yield stress in magnetorheological fluids using ultrasounds. Applied Physics Letters, 2013, 102, pp.081907. ⟨10.1063/1.4794023⟩. ⟨hal-00850578⟩