Development of Grease Tackiness Test

Harmon, Matthew; Powell, Bryan; Barlebo-Larsen, Ingrid; Lewis, Roger

doi:10.1080/10402004.2018.1526991

Cited by 13 publications

(16 citation statements)

References 15 publications

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“…This method can perform multiple measurements of adhesion and tackiness under varying conditions automatically so that the speed, load and temperature can be recorded with one run. Based on the authors' previous experience [6][7][8][9][10][11][12], an optimised test profile is proposed, as presented in Table 1. In this profile, the speed and temperature vary, whereas the load remains constant.…”

Section: Effect Of Temperaturementioning

confidence: 99%

“…For this reason, there is a strong need to develop a consistent, repeatable method that can quantify tackiness. During the last 10 years, more sophisticated experimental methods with different testers have been developed [5][6][7][8][9][10]. In all cases, the theoretical principle is based on measuring the interaction forces between a probe and a grease layer.…”

Section: Introductionmentioning

confidence: 99%

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Quantification of Tackiness of a Grease: The Road to a Method

et al. 2021

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In this work, we report on the most recent progress in studying temperature influence on tackiness of greases, as well as the reproducibility of the method. Tackiness and adhesion of greases have been identified as key intrinsic properties that can influence their functionality and performance. During the last eight years, a reliable method to quantify the tackiness and adhesion of greases has evolved from an experimental lab-scale set-up towards a standardised approach, including an ASTM method and a dedicated test tool. The performance of lubricating greases—extensively used in diverse industrial applications—is strongly dependent on their adherence to the substrate, cohesion and thread formation or tackiness of the greases. This issue attracts more and more industrial interest as the complexity in grease formulation evolves and it is harder to differentiate between available greases. With this method, grease formulators will have an efficient measurement tool to support their work.

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Section: Effect Of Temperaturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Quantification of Tackiness of a Grease: The Road to a Method

et al. 2021

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“…There has been some work recently done that has developed test methodologies in the laboratory to measure these variables for curve lubricants. A recent paper has developed a tackiness test for grease [16]. This involves an approach-retraction method which squeezes grease between two specimens and measures the force required to separate the specimens.…”

Section: Friction Modifier Researchmentioning

confidence: 99%

“…A test method originally developed for curve lubricants [16] was used to evaluate the tackiness of four variations of the same TORFM. No adaptation of the test method was needed.…”

Section: Tackinessmentioning

confidence: 99%

“…A recent paper has developed a tackiness test for grease. 16 This involves an approach-retraction method, which squeezes grease between two specimens and measures the force required to separate the specimens. This paper analysed the force–distance graph produced and calculated the work done to break the grease strings and thus defined the tackiness for different greases.…”

Section: Friction Modifier Researchmentioning

confidence: 99%

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New laboratory methodologies to analyse the top of rail friction modifier performance across different test scales

Harmon

Lewis

2020

Proceedings of the Institution of Mechanical Engineers, Part F:

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Test methodologies originally developed for greases have been adapted to be used for top of rail friction modifiers (TORFMs). This has included: a small-scale benchtop tribometer to measure the tackiness of different TORFMs, attaching an applicator bar to a section of rail and rolling a scaled-wheel through the TORFM applied to the rail head to analyse the effect of different variables on pick-up, and applying TORFM to a full-scale test facility to analyse the scaling effects and the effect of slip, load and speed on pick-up. These methods can be used to measure the relative performance of different TORFMs with respect to how much product is picked up by the wheel. The results have shown that the relative ranking of different TORFMs is the same across the three test scales. This shows that these small-scale test methods that are more suitable for inclusion in test standards could be used to reduce the need for the more time-consuming and expensive larger scale tests, as the relative performance is the same.

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Oleo‐Dispersions of Electrospun Cellulose Acetate Butyrate Nanostructures: Toward Renewable Semisolid Lubricants

Martín‐Alfonso,

Rubio‐Valle,

Martín‐Alfonso

et al. 2024

Advanced Sustainable Systems

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In this work, the electrospinnability of cellulose acetate butyrate (CAb) solutions, and the ability of the resulting micro‐ and nano‐architectures to structure castor oil are studied aiming to develop eco‐friendly lubricating greases. Particles, beaded‐fibers, defect‐free fibers, and porous nanostructures are successfully prepared by dissolving CAb in N,N‐dimethylacetamide/acetone (DMAc:Ac, 1:2 w/w) and methylene chloride/acetone (DM:Ac, 1:1 w/w) solvent mixtures at different concentrations (2.5–15 wt.%). The formation of bead‐free nanofibers is favored at concentration above 10 wt.%, when solutions achieve relaxation times of ≈50 ms and shear‐thinning in extensional and shear flow tests, respectively. Non‐porous and porous CAb nanostructures are successfully used as castor oil thickeners at concentrations of 3–5 wt.%, leading a wide variety of rheological responses which mimic those of traditional semisolid lubricants. The surface properties of the nanofibers have a significant impact on the wear and friction performance in metal–metal contact, which has been associated with the oil release ability of the generated 3D network. Oleo‐dispersions prepared with smooth fibers show tribological performance comparable to, or even better than, commercial lithium greases. Overall, this study reveals the potential of CAb electrospun nanostructures for the development of next‐generation renewable semisolid lubricant formulations.

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Development of Grease Tackiness Test

Cited by 13 publications

References 15 publications

Quantification of Tackiness of a Grease: The Road to a Method

Quantification of Tackiness of a Grease: The Road to a Method

New laboratory methodologies to analyse the top of rail friction modifier performance across different test scales

Oleo‐Dispersions of Electrospun Cellulose Acetate Butyrate Nanostructures: Toward Renewable Semisolid Lubricants

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