An improved model of ER fluids in squeeze-flow through model updating of the estimated yield stress

Wahed, Ali K. El; Sproston, J.L.; Stanway, R.; Williams, E.W.

doi:10.1016/s0022-460x(03)00374-2

Cited by 26 publications

(19 citation statements)

References 25 publications

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“…Many of these relations have previously been assembled in useful review sections of some papers by Meeten [12,13,75,76]. Finally, it is worth noting that electrorheological materials are often modelled as Bingham fluids, and thus several authors in this area have analysed steady and oscillatory squeeze flow of Bingham fluids [1,[3][4][5].…”

Section: Yield Stress (Plastic and Viscoplastic) Materialsmentioning

confidence: 99%

“…Squeeze flows are found in the engineering, biology and rheometry domains. In the engineering domain, dampers are sometimes made using electrorheological fluids [1][2][3][4][5], motors, bearings and lubrication involve fluid squeezing, and the compression moulding processes of metals and polymers (filled or unfilled) are essentially squeeze flows, often further complicated by temperature gradients [6]. Less obviously, the strength of pressure-sensitive adhesive bonds is equivalent to the force required to separate two surfaces in a "reverse squeeze flow" (where interfacial tension additionally plays an important role).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Squeeze flow theory and applications to rheometry: A review

Engmann

Servais

Burbidge

2005

Journal of Non-Newtonian Fluid Mechanics

394

263

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Section: Yield Stress (Plastic and Viscoplastic) Materialsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Squeeze flow theory and applications to rheometry: A review

Engmann

Servais

Burbidge

2005

Journal of Non-Newtonian Fluid Mechanics

394

263

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“…To additionally improve the viscosity change, nanoscale particles are added in the electrorheological fluids ("giant electrorheological effect" [40,137]). In [28] and [105] further mathematical modeling is presented for the dynamic flow behavior of ERfluids.…”

Section: Electrorheological Fluidsmentioning

confidence: 99%

Actuator Design

Haus¹,

Kern²,

Matysek³

et al. 2014

Springer Series on Touch and Haptic Systems

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Actuators are the most important elements of every haptic device, as their selection, respectively, their design influences the quality of the haptic impression significantly. This chapter deals with frequently used actuators structured based on their physical working principle. It focuses on the electrodynamic, electromagnetic, electrostatic, and piezoelectric actuation principle. Each actuator type is discussed as to its most important physical basics, with examples of their dimensioning, and one or more applications given. Other rarely used actuation principles are mentioned in several examples. The previous chapters were focused on the basics of control-engineering and kinematic design. They covered topics of structuring and fundamental character. This and the following chapters deal with the design of technical components as parts of haptic devices. Experience teaches us that actuators for haptic applications can rarely be found "off-the-shelf". Their requirements always include some outstanding features in rotational frequency, power density, working point, or geometry. These specialties make it necessary and helpful for their applicants to be aware of the capabilities and possibilities of modifications of existing actuators. Hence, this chapter addresses both groups of readers: users who want to choose a certain actuator and the mechanical engineer who intends to design a specific actuator for a certain device from scratch.Before a final selection of actuators is made, the appropriate kinematics and the control-engineering structure, according to the previous chapters, should have been fixed. However, in order to handle these questions in a reasonable way, some basic understanding of actuators is mandatory. In particular, the available energy densities, forces, and displacements should be estimated correctly for the intended haptic application. This section provides some suggestions and guidelines to help and preselect appropriate actuators based on the typical requirements. 9.1.

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“…During these tests while force level predictions were adequate when the bi-viscous model was applied, there was some temporal variation between theoretical and predicted data. In an effort to simulate the experimental data more accurately Wahed et al [7] modified the bi-viscous model using experimental data to update the yield stress value of the fluid. The simple power law relationship between the yield stress and the electric field was replaced by an inverse and inverse square relationship which was not related to any physical mechanism but gave more accurate quantitative results.…”

Section: Introductionmentioning

confidence: 99%