A COMPARISON OF THE PERFORMANCE OF ER FLUIDS IN SQUEEZE

1996 ◽  
Vol 10 (23n24) ◽  
pp. 3081-3091 ◽  
Author(s):  
J L Sproston ◽  
A K El Wahed ◽  
E W Williams ◽  
R Stanway
Keyword(s):  
Shear Stress ◽  
Theoretical Model ◽  
Applied Field ◽  
Theoretical Study ◽  
Time Dependent ◽  
Squeeze Flow ◽  
Device Performance ◽  
Displacement Control ◽  
Lower Electrode ◽  
Er Fluids

This paper is concerned with an experimental and theoretical study of the characteristics of two ER fluids and their application to vibration control when used in squeeze flow. It is seen that when the fluids are sandwiched between two electrodes, the lower one oscillating and the upper one fixed, displacement control of the lower electrode can be achieved by control of the applied field. Of particular interest is the dependence of the force transmitted across the fluids on oscillation frequency and applied field. A time-dependent theoretical model is seen to satisfactorily predict the device performance when allowance is made for a non-linear dependence of the post-yield shear stress on shear rate.

scholarly journals Time-Dependent Response of a Recycled C&D Material-Geotextile Interface under Direct Shear Mode

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3070
Author(s):  
Fernanda Bessa Ferreira ◽  
Paulo M. Pereira ◽  
Castorina Silva Vieira ◽  
Maria de Lurdes Lopes
Keyword(s):  
Shear Stress ◽  
Stress Relaxation ◽  
Shear Displacement ◽  
Time Dependent ◽  
Shear Behaviour ◽  
Displacement Rate ◽  
Shear Mode ◽  
Direct Shear ◽  
Constant Displacement ◽  
Shear Box

Geosynthetic-reinforced soil structures have been used extensively in recent decades due to their significant advantages over more conventional earth retaining structures, including the cost-effectiveness, reduced construction time, and possibility of using locally-available lower quality soils and/or waste materials, such as recycled construction and demolition (C&D) wastes. The time-dependent shear behaviour at the interfaces between the geosynthetic and the backfill is an important factor affecting the overall long-term performance of such structures, and thereby should be properly understood. In this study, an innovative multistage direct shear test procedure is introduced to characterise the time-dependent response of the interface between a high-strength geotextile and a recycled C&D material. After a prescribed shear displacement is reached, the shear box is kept stationary for a specific period of time, after which the test proceeds again, at a constant displacement rate, until the peak and large-displacement shear strengths are mobilised. The shear stress-shear displacement curves from the proposed multistage tests exhibited a progressive decrease in shear stress with time (stress relaxation) during the period in which the shear box was restrained from any movement, which was more pronounced under lower normal stress values. Regardless of the prior interface shear displacement and duration of the stress relaxation stage, the peak and residual shear strength parameters of the C&D material-geotextile interface remained similar to those obtained from the conventional (benchmark) tests carried out under constant displacement rate.

scholarly journals THE EFFECT OF ELECTRIC FIELD DIRECTION ON THE-SHEAR STRESS OF ER FLUIDS

1996 ◽  
Vol 45 (4) ◽  
pp. 640
Author(s):  
WANG ZUO-WEI ◽  
LIN ZHI-FANG ◽  
TAO RUI-BAO
Keyword(s):  
Shear Stress ◽  
Electric Field ◽  
Field Direction ◽  
Electric Field Direction ◽  
Er Fluids

ER fluids in the squeeze-flow mode: an application to vibration isolation

1992 ◽  
Vol 28 (1) ◽  
pp. 89-94 ◽  
Author(s):  
R. Stanway ◽  
J.L. Sproston ◽  
M.J. Prendergast ◽  
J.R. Case ◽  
C.E. Wilne
Keyword(s):  
Vibration Isolation ◽  
Squeeze Flow ◽  
Flow Mode ◽  
Er Fluids

THE METHODS FOR MEASURING SHEAR STRESS OF POLAR MOLECULE DOMINATED ER FLUIDS

2007 ◽  
Vol 21 (28n29) ◽  
pp. 4813-4818 ◽  
Author(s):  
RONG SHEN ◽  
XUEZHAO WANG ◽  
YANG LU ◽  
GANG SUN ◽  
WEIJIA WEN ◽  
...  
Keyword(s):  
Shear Stress ◽  
Stress Measurement ◽  
Measurement Process ◽  
Interface Effect ◽  
Polar Molecule ◽  
High Shear ◽  
High Shear Stress ◽  
Er Fluids ◽  
Metallic Electrodes

A series of ER fluids materials with high shear stress have been developed recently, which named as polar molecule dominated electrorheological (PM-ER) fluids. Difficulties have been met in shear stress measurement process due to the slide of PM-ER fluids on the surface of metallic electrodes. In this paper, two shearing configurations have been developed to remove the interface effect. The intrinsic shear stress of ER fluids can be obtained by using the devices.

scholarly journals Time-Dependent Shear Stress Distributions during Extended Flow Perfusion Culture of Bone Tissue Engineered Constructs

Fluids ◽  
2018 ◽  
Vol 3 (2) ◽  
pp. 25 ◽  
Author(s):  
Cortes Williams ◽  
Olufemi Kadri ◽  
Roman Voronov ◽  
Vassilios Sikavitsas
Keyword(s):  
Shear Stress ◽  
Bone Tissue ◽  
Perfusion Culture ◽  
Time Dependent ◽  
Stress Distributions ◽  
Flow Perfusion

4s to 5s and 4p photoexcitation dynamics of K atoms from the surface of helium nanodroplets: a theoretical study

2019 ◽  
Vol 21 (7) ◽  
pp. 3626-3636 ◽  
Author(s):  
Maxime Martinez ◽  
François Coppens ◽  
Manuel Barranco ◽  
Nadine Halberstadt ◽  
Martí Pi
Keyword(s):  
Superfluid Helium ◽  
Density Functional ◽  
Theoretical Study ◽  
Density Functional Method ◽  
Potassium Atom ◽  
Functional Method ◽  
Time Dependent ◽  
Spin Orbit ◽  
Helium Nanodroplets

We study the photodissociation of the potassium atom from a superfluid helium nanodroplet upon 5s 2S or 4p 2P excitation using the time-dependent helium density functional method (He-TDDFT). The results show possible K spin–orbit relaxation.

Odd–even harmonic generation from oriented CO molecules in linearly polarized laser fields and the influence of the dynamic core-electron polarization

2019 ◽  
Vol 21 (43) ◽  
pp. 24177-24186 ◽  
Author(s):  
Ngoc-Loan Phan ◽  
Cam-Tu Le ◽  
Van-Hung Hoang ◽  
Van-Hoang Le
Keyword(s):  
Harmonic Generation ◽  
Theoretical Study ◽  
Polar Molecule ◽  
Time Dependent ◽  
Laser Fields ◽  
Core Electron ◽  
Electron Polarization ◽  
Linearly Polarized ◽  
Active Electron ◽  
Even Harmonics

We present a detailed theoretical study of the odd–even harmonics generated from the polar molecule CO by the method based on numerically solving the time-dependent Schrödinger equation within the single-active-electron approximation.

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