Harmonic analysis in grease rheology

Karis, T. E.; Kono, R.-N.

doi:10.1002/app.12548

Cited by 20 publications

(10 citation statements)

References 17 publications

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“…Cyriac et al [18] reported a two-fold reduction of yield stress with a certain temperature increase for both lithium-and polyurea-thickened greases. A decrease in the yield stress of the lithium grease at elevated temperature was reported in Reference [19]. Ide et al [20] found the activation energy based on Arrhenius's law as an appropriate parameter for life prediction of lithium greases.…”

Section: Degradation Systems Of Greasesmentioning

confidence: 92%

The Effect of Addition of Nanoparticles, Especially ZrO2-Based, on Tribological Behavior of Lubricants

Rylski

Siczek

2020

Lubricants

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The aim of the paper was to discuss different effects, such as, among others, agglomeration of selected nanoparticles, particularly those from zirconia, on the tribological behavior of lubricants. The explanation of the difference between the concepts of ‘aggregation’ and ‘agglomeration’ for ZrO2 nanoparticles is included. The factors that influence such an agglomeration are considered. Classification and thickeners of grease, the role of additives therein, and characteristics of the lithium grease with and without ZrO2 additive are discussed in the paper. The role of nanoparticles, including those from ZrO2 utilized as additives to lubricants, particularly to the lithium grease, is also discussed. The methods of preparation of ZrO2 nanoparticles are described in the paper. The agglomeration of ZrO2 nanoparticles and methods to prevent it and the lubrication mechanism of the lithium nanogrease and its tribological evaluation are also discussed. Sample preparation and a ball-on disc tester for investigating of spinning friction are described. The effect of ZrO2 nanoparticles agglomeration on the frictional properties of the lithium grease is shown. The addition of 1 wt.% ZrO2 nanoparticles to pure lithium grease can decrease the friction coefficient to 50%. On the other hand, the agglomeration of ZrO2 nanoparticles in the lithium grease can increase twice the friction coefficient relative to that for the pure grease.

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Section: Degradation Systems Of Greasesmentioning

confidence: 92%

The Effect of Addition of Nanoparticles, Especially ZrO2-Based, on Tribological Behavior of Lubricants

Rylski

Siczek

2020

Lubricants

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“…Several works on MRG have validated that the settling problem of the iron particles can be eliminated by utilizing grease which has thixotropic properties as a medium [24,25,26]. These properties restrict any reversible flow in the application devices without the presence of external force [27,28]. In addition, some other advantages of MRG include self-sealing, thick viscosity, anti-wear properties, low friction, and robustness to extreme temperatures and pressures [29,30].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Particle Shapes on the Field-Dependent Rheological Properties of Magnetorheological Greases

Mohamad

Ubaidillah

Mazlan

et al. 2019

IJMS

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The transient response of magnetorheological (MR) materials, in general, is very important for design consideration in MR-based devices. Better response to magnetic fields is beneficial for a better response rate to the electrical current applied in the electromagnetic coil. As a result, MR-based devices would have a high response to external stimuli. In this work, the principal characteristics of magnetorheological greases (MRGs) which have two different particle shapes are experimentally investigated. One type of particle distributed in the grease medium is conventional spherical-shaped carbonyl iron (CI) particles, while the other is plate-like CI particles made using a high-energy rotary ball mill from spherical CI particles. A set of bidisperse MRG samples are firstly prepared by adjusting the weight percentage of the plate-like CI particles and mixing with the spherical CI particles. Subsequently, three important properties of MRGs in terms of their practical application are measured and compared between the two different particle shapes. The field-dependent apparent viscoelastic properties of the prepared MRG samples are measured, followed by the field-dependent storage and loss moduli using an oscillatory shear rheometer. In addition, the transient response time, which indicates the speed in the actuating period of MRGs, is measured by changing the strain amplitude. Then, a comparative assessment on the three properties are undertaken between two different particle shapes by presenting the corresponding results in the same plot. It is shown that the bidisperse MRG with plate-like CI particles exhibits an increase in the initial apparent viscosity as well as stiffness property compared to the MRG with spherical particles only.

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“…The application of LAOS has been useful for materials that exhibit strong non-linearities, e.g. dynamics of polymer solutions [15][16][17], flow of concentrated and diluted suspensions [18][19][20][21], biofluids characterization [22], non-linear soft materials [23], presence of yield stress within the viscoelastic behavior [24].…”

Section: Introductionmentioning

confidence: 99%

Determination of the non-linear parameter (mobility factor) of the Giesekus constitutive model using LAOS procedure

Calin

Wilhelm

Bălan

2010

Journal of Non-Newtonian Fluid Mechanics

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Harmonic analysis in grease rheology

Cited by 20 publications

References 17 publications

The Effect of Addition of Nanoparticles, Especially ZrO2-Based, on Tribological Behavior of Lubricants

The Effect of Addition of Nanoparticles, Especially ZrO2-Based, on Tribological Behavior of Lubricants

The Effect of Particle Shapes on the Field-Dependent Rheological Properties of Magnetorheological Greases

Determination of the non-linear parameter (mobility factor) of the Giesekus constitutive model using LAOS procedure

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