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Viscoplastic properties of an MR fluid in a damper

Skalski P., Zalewski R.

Journal of Theoretical and Applied Mechanics

2014

Vol. 52 nr 4

1061--1070

The aim of this paper is to mathematically describe and analyze the viscoplastic properties of a magnetorehological (MR) fluid. The scope of the discussed research has been limited to the T-MR SiMR 132 DG damper prototype. Laboratory tests have been performed on a specially developed experimental stand with a kinematic excitation rule. On the basis of the experimental data, conventional yield points and maximum shear stresses for the analyzedMR fluid, including variable shear rate, current intensity flowing through a solenoid, liquid temperature and gap height have been analyzed. Basing on the acquired results, the parameters of Bodner-Partom constitutive equations have been estimated. The identified viscoplastic model has been used to carry out simulation tests that enabled verification of the numerical results and real experimental data.

Analysis of Viscoplastic Properties of a Magnetorheological Fluid in a Damper

Bajkowski J., Skalski P.

Acta Mechanica et Automatica

2012

Vol. 6, no. 3

5-10

The aim of presented paper is a mathematical description and an analysis of viscoplastic properties of a magnetorehological fluid in operational conditions of a damper’s work. The authors considers the possibility of use the viscoplastic law, typically for metals, to describe the behaviour of device with a magnethorheological fluid.

Viscoplastic Models for a Magnetorheological Damper

Skalski P., Bajkowski J., Woźnica K.

Machine Dynamics Research

2010

Vol. 34, No. 2

121-126

This work presents the Bodner-Partom and Perzyna constitutive law to describe a dynamic behaviour of magnetorheological damper. Those laws usually used for metals, are presented here for shear stresses to express viscoplastic properties of MR fluid. We determine parameters for fluid in the damper prototype that are required for the Bodner-Partom and Perzyna models. Experimental results are later compared with numerical results.

Modelling of the Behaviour of a Magnetorheological Damper by the Bodner-Partom Constitutive Equations

Skalski P., Woźnica K., Bajkowski J.

Machine Dynamics Problems

2008

Vol. 32, No. 3

91-97

This paper presents an approach to describe the dynamic behaviour of a magnetorheological (MR) damper by the Bodner-Partom (B-P) constitutive equations. The B-P equations usually used for metal materials are presented for shear stresses to express viscoplastic proprieties of a MR fluid. The material parameters for the LORD RD 1005-3 damper are determined. The experimental results are shown and are compared with the numerical results.