A new theoretical model about shear stress in magnetorheological fluids with small shear deformation

2005 ◽  
Vol 20 (1) ◽  
pp. 52-56 ◽  
Author(s):  
Zhu Changchun ◽  
Zhai Pengcheng ◽  
Liu Lisheng ◽  
Zhang Qingjie
Keyword(s):  
Shear Stress ◽  
Theoretical Model ◽  
Shear Deformation ◽  
Magnetorheological Fluids ◽  
Small Shear

Shear stress in MR fluid with small shear deformation in bctlattic structure

2008 ◽  
Vol 23 (4) ◽  
pp. 532-535
Author(s):  
Lisheng Liu ◽  
Zhongwei Ruan ◽  
Pengcheng Zhai ◽  
Qingjie Zhang
Keyword(s):  
Shear Stress ◽  
Shear Deformation ◽  
Mr Fluid ◽  
Small Shear

Measurement of temperature-dependent mechanical properties of magnetorheological fluids using a parallel disk shear stress testing device

2015 ◽  
Vol 231 (9) ◽  
pp. 1725-1737 ◽  
Author(s):  
Daoming Wang ◽  
Bin Zi ◽  
Yishan Zeng ◽  
Fangwei Xie ◽  
Youfu Hou
Keyword(s):  
Mechanical Properties ◽  
Shear Stress ◽  
High Temperature ◽  
Stress Testing ◽  
Temperature Characteristic ◽  
Magnetorheological Fluids ◽  
High Temperature Treatment ◽  
Temperature Cycle ◽  
Testing Device ◽  
Parallel Disk

Mechanical properties are critical to the working performance of magnetorheological fluids (MRFs), especially in high temperature situations. This paper presents an experimental investigation to analyze the effects of temperature on mechanical properties of MRFs. First, a parallel disk method was implemented for the shear stress measurement of MRFs and the measurement principle was theoretically illustrated. Then, a detailed introduction to the MRF sample preparation and the testing device development was performed as well. In the study, five kinds of MRF samples with different material parameters were prepared and a shear stress testing device which possesses the temperature control function was developed and evaluated. After these, a series of measurements were conducted on the viscosity–temperature characteristic, shear stress–temperature characteristic and thermal stability of MRF samples. Measuring results indicated that the mechanical properties of MRFs were obviously dependent on temperature. The phenomenon mainly embodied in the reduction of off-field viscosity and shear stress with increasing temperature, as well as the performance degradation after undergoing a low–high–low temperature cycle or a high temperature treatment of more than 150 ℃.

Thermoelastic bending analysis of laminated composite plates according to various shear deformation theories

2014 ◽  
Vol 5 (1) ◽  
Author(s):  
Atteshamuddin Shamshuddin Sayyad ◽  
Bharati Machhindra Shinde ◽  
Yuwaraj Marotrao Ghugal
Keyword(s):  
Shear Stress ◽  
Shear Deformation ◽  
Transverse Shear ◽  
Virtual Work ◽  
Plate Theory ◽  
Thermal Response ◽  
Laminated Composite ◽  
Composite Plates ◽  
Shear Stresses ◽  
Laminated Composite Plates

AbstractThis study presents the thermoelastic analysis of laminated composite plates subjected to sinusoidal thermal load linearly varying across the thickness. Analytical solutions for thermal displacements and stresses are investigated by using a unified plate theory which includes different functions in terms of thickness coordinate to represent the effect of shear deformation. The theory presented is variationally consistent, does not require shear correction factor, and gives rise to transverse shear stress variation such that the transverse shear stresses vary parabolically across the thickness satisfying shear stress free surface conditions. Governing equations of equilibrium and associated boundary conditions of the theory are obtained using the principle of virtual work. The Navier solution for simply supported laminated composite plates has been developed. Numerical results are presented to demonstrate the thermal response of the laminated composite plates.

NONLINEAR BENDING ANALYSIS OF FUNCTIONALLY GRADED PLATES UNDER PRESSURE LOADS USING A FOUR VARIABLE REFINED PLATE THEORY

2014 ◽  
Vol 11 (04) ◽  
pp. 1350062 ◽  
Author(s):  
MOHAMED ATIF BENATTA ◽  
ABDELHAKIM KACI ◽  
ABDELOUAHED TOUNSI ◽  
MOHAMMED SID AHMED HOUARI ◽  
KARIMA BAKHTI ◽  
...  
Keyword(s):  
Shear Stress ◽  
Shear Deformation ◽  
Transverse Shear ◽  
Plate Theory ◽  
Functionally Graded ◽  
Shear Stresses ◽  
Functionally Graded Plates ◽  
Refined Plate Theory ◽  
Von Karman ◽  
Von Kármán

The novelty of this paper is the use of four variable refined plate theory for nonlinear analysis of plates made of functionally graded materials. The plates are subjected to pressure loading and their geometric nonlinearity is introduced in the strain–displacement equations based on Von–Karman assumptions. Unlike any other theory, the theory presented gives rise to only four governing equations. Number of unknown functions involved is only four, as against five in case of simple shear deformation theories of Mindlin and Reissner (first shear deformation theory). The plate properties are assumed to be varied through the thickness following a simple power law distribution in terms of volume fraction of material constituents. The theory presented is variationally consistent, does not require shear correction factor, and gives rise to transverse shear stress variation such that the transverse shear stresses vary parabolically across the thickness satisfying shear stress free surface conditions. The fundamental equations for functionally graded plates are obtained using the Von–Karman theory for large deflection and the solution is obtained by minimization of the total potential energy. Numerical results for functionally graded plates are given in dimensionless graphical forms; and the effects of material properties on deflections and stresses are determined. The results obtained for plate with various thickness ratios using the theory are not only substantially more accurate than those obtained using the CPT, but are almost comparable to those obtained using higher order theories having more number of unknown functions.

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.

The Influence of Anchor Inclination on Pull-out Resistance of Clays

1973 ◽  
Vol 10 (4) ◽  
pp. 664-669 ◽  
Author(s):  
T. H. Hanna
Keyword(s):  
Shear Stress ◽  
Theoretical Model ◽  
Stress State ◽  
In Situ Stress ◽  
Stiff Clays ◽  
Pile Shaft ◽  
Pull Out

A theoretical model is described that was used to examine the influence of anchor inclination on pull-out capacity. Use was made of previous general findings for pile shaft adhesion prediction in stiff clays. It is shown that the adhesion available at the anchor shaft – clay interface depends on: (1) the in situ stress state in the ground; (2) anchor inclination; and (3) the initial shear stress existing in the ground in the direction of the anchor shaft. The possible importance of the reported trends is considered.

Simulation of the optimal diameter and wall thickness of hollow Fe3O4 microspheres in magnetorheological fluids

Soft Matter ◽  
2018 ◽  
Vol 14 (24) ◽  
pp. 5080-5091 ◽  
Author(s):  
Lei Pei ◽  
Haoming Pang ◽  
Kaihui Chen ◽  
Shouhu Xuan ◽  
Xinglong Gong
Keyword(s):  
Shear Stress ◽  
Wall Thickness ◽  
Particle Diameter ◽  
Magnetorheological Fluids ◽  
Quadratic Dependence ◽  
Fe3o4 Microspheres ◽  
Optimal Diameter

The shear stress exhibited a quadratic dependence on the dimensionless wall thickness under a certain particle diameter.

Shear Flow and Large Amplitude Oscillation Shear Study of Solutions of Aggregating Micellar Casein Particles

2008 ◽  
Vol 18 (2) ◽  
pp. 23050-1-23050-7 ◽  
Author(s):  
Anne Pitkowski ◽  
Taco Nicolai ◽  
Dominique Durand
Keyword(s):  
Shear Stress ◽  
Shear Rate ◽  
Shear Flow ◽  
Heating Temperature ◽  
Constant Shear ◽  
Micellar Casein ◽  
Large Amplitude Oscillation ◽  
Increasing Temperature ◽  
Small Shear ◽  
Constant Shear Rate

Abstract Small micellar casein particles were formed in aqueous solutions of native casein after addition of polyphosphate. These so-called submicelles aggregated and gelled with a rate that increased with increasing temperature. The evolution of the viscosity during this process was determined at constant shear rate or shear stress. When applying a small shear stress the viscosity increased strongly until the shear rate became immeasurably slow, but when the applied shear stress exceeded a critical value (σc) the aggregates broke up and the viscosity reached a maximum. At longer times the viscosity decreased rapidly at first, followed by a very slow decrease. σc was independent of the shear rate and heating temperature, but increased strongly with increasing casein concentration. At constant shear rate the stress remained close to σc, but fluctuated irregularly. After cessation of shear flow, gels were formed rapidly. Oscillation shear measurements for σ > σc showed a strongly non-linear response at the time of maximum viscosity.

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