Effect of pressure on the physical properties of magnetorheological fluids
Journal Title: Frattura ed Integrità Strutturale - Year 2013, Vol 7, Issue 23
Abstract
To date, several applications of magnetorheological (MR) fluids are present in the industrial world, nonetheless system requirements often needs better material properties. In technical literature a previous work shows that MR fluids exhibit a pressure dependency called squeeze strengthen effect. Since a lot of MR fluid based devices are rotary devices, this paper investigates the behaviour of MR fluids under pressure when a rotation is applied to shear the fluid. The system is designed in order to apply both the magnetic field and the pressure and follows a Design of Experiment approach. The experimental apparatus comprises a cylinder in which a piston is used both to apply the pressure and to shear the fluid. The magnetic circuit is designed to provide a nearly constant induction field in the MR fluid. The experimental apparatus measures the torque as a function of the variables considered and the yield shear stress is computed. The analysis of the results shows that there is a positive interaction between magnetic field and pressure, which enhances the MR fluid performances more than twice.
Authors and Affiliations
A. Spaggiari, E. Dragoni
Keywords
Related Articles
- EP ID EP92982
- DOI 10.3221/IGF-ESIS.23.08
- Views 69
- Downloads 0
Modello numerico per la simulazione e l’ottimizzazione di controlli non distruttivi con ultrasuoni
I controlli non distruttivi basati sull’impiego di ultrasuoni sono ampiamente usati per la loro efficacia e affidabilità nel rilevamento di difetti. La generazione di onde ultrasonore e la propagazione in strutture di f...
Inter-laminar shear stress in hybrid CFRP/austenitic steel
Bolted joints are the most common solution for joining composite components in aerospace structures. Critical structures such as wing to fuselage joints, or flight control surface fittings use bolted joining tech...
Ultrasonic fatigue testing device under biaxial bending
A new fatigue testing device has been developed to test specimens under biaxial loading at 20 kHz. A flat smooth specimen with a disc geometry is placed on a torus frame and cyclically loaded at the center of its&...
Weight Function Method for computations of crack face displacements and stress intensity factors of center cracks
The weight function method provides a powerful and reliable tool for the determination of the stress intensity factor around the crack tip in a linearly elastic cracked solid subjected to arbitrary loading condit...
Modelling of ultrasonic impact treatment (UIT) of welded joints and its effect on fatigue strength
Ultrasonic impact treatment (UIT) is a remarkable post-weld technique applying mechanical impacts in combination with ultrasound into the welded joints. In the present work, a 3D simulation method including w...