Magnetorheological (MR) fluids are commonly suspensions consisting of magnetic particles and carrier liquids. The materials are remarkable for their precipitous and capable of being reversed of fluid viscosity controlled by applied magnetic field. In this paper, experimental investigations of three types of MR fluids in tension mode have been carried out. MRF-241ES was a water-based MR fluid, while MRF-132DG and MRF-122-2ED were hydrocarbon-based MR fluids. Magnetic properties of the MR fluids vary significantly due to a higher particle density in MRF-241ES (3.80 to 3.92 g/cm³) than MRF-132DG (2.98 to 3.18 g/cm³) and MRF-122-2ED (2.32 to 2.44 g/cm³). The results were presented starting with different electrical currents to generate magnetic fields, using different initial gap sizes and tensile speeds. The tension process, in terms of stress-strain relationship of MR fluids, can be separated into three regions. The tensile stress curves in the first region increased dramatically to the peak point as the tensile strain increased. Subsequently, in the second region, the tensile stress curves declined rapidly for small values of the tensile strain. Lastly, in the third region, the tensile stress curves further decreased slowly with further elongation. The results revealed that high values of stress occurred where the strain was high, and that even higher values were obtained when the electrical current was high. Furthermore, the magnitude of the stress, for a given strain, depended on the initial gap size. Curves showing the relationships between the stress and the strain were constructed for two different initial gap sizes. It was seen that, for larger initial gap sizes, there were larger stress values. The sizes of the three regions depended on the initial gap sizes. However, contradicting with the effects of the applied current and the initial gap size, the tensile speed had a small effect on the stress-strain relationship which was considered as being neglected.

• Legal notice:
  

  Copyright (c) Pielaszek Research, all rights reserved.
  The above materials, including auxiliary resources, are subject to Publisher's copyright and the Author(s) intellectual rights. Without limiting Author(s) rights under respective Copyright Transfer Agreement, no part of the above documents may be reproduced without the express written permission of Pielaszek Research, the Publisher. Express permission from the Author(s) is required to use the above materials for academic purposes, such as lectures or scientific presentations.
  In every case, proper references including Author(s) name(s) and URL of this webpage: https://science24.com/paper/15984 must be provided.

1. A Simulation Study of Magnetostrictive Material Terfenol-D in Automotive CNG Fuel Injection Actuation