Shear Strength and Tribological Properties of Stearic Acid Films—Part I: On Glass and Aluminum-Coated Glass

Timsit, R. S.; Pelow, C. V.

doi:10.1115/1.2920854

Cited by 43 publications

(34 citation statements)

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“…7, especially when the normal load is less than 0.6 N, beyond which a deviation from the collective (master) curve is observed from ZX530. Such master curve has also been observed by Briscoe et al [23,24], and Timsit and Pelow [25,26] in various thin organic films. These results suggest that our specimens cleaned with water are also covered by some surface layer that behaves like the aforementioned organic films.…”

Section: Influence Of Surface Layersupporting

confidence: 50%

The sliding friction of thermoplastic polymer composites tested at low speeds

Liu

Schaefer

2006

Wear

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Section: Influence Of Surface Layersupporting

confidence: 50%

The sliding friction of thermoplastic polymer composites tested at low speeds

Liu

Schaefer

2006

Wear

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“…Unique interaction between fatty acids and aluminum compounds has been reported in fields other than paper chemistry. For example, aluminum interfaces in oil were found to be effectively lubricated by the presence of fatty acid molecules whose polar groups were attached to the aluminum oxide layers [30]. Formation of self-assembled monolayers of fatty acids on aluminum oxide surface was also reported, and such monolayers could be partially removed by rinsing with CHCl3 [31,32].…”

Section: Attractive Forces Acting At Surface-modified Afm Probes/subsmentioning

confidence: 89%

Specific Attraction at the Carboxyl Terminus of Fatty Acid/Oxidized Aluminum Interface for the Sizing Appearance of Fiber-network Materials

et al. 2009

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IntroductionPaper-based products have occupied much public attention as eco-friendly, convenient, and multi-purpose materials having a wide range of applications [1][2][3]. A paper sheet fundamentally has a layered, porous micronetwork architecture consisting of hydrophilic cellulosic pulp fibers. That structure results in excellent liquid absorptive properties, especially for water. The wetting characteristics of solid material surfaces are of great importance from a practical viewpoint. In the case of paper materials, adequate water-repellency, the so-called sizing effect, has been required for improvement of printing quality by ink-bleeding control, runability of coating operation, durability of liquid containers, and other surface characteristics [4]. Thus, sizing phenomena and mechanisms are of great interest for fundamental research and for functional design of cellulosic fiberbased materials.Paper sizing treatments provide a controllable slowdown of water penetration into the porous fiber network of hydrophilic paper sheets. Control is achieved by using small amounts of sizing agents with proper retention aids, through internal additive addition or surface coating systems. In particular, sizing systems with rosin acids and aluminum sulfate (alum) have long been widely applied in the industrial papermaking process, because they are highly effective, have good cost performance, and are easily used. Rosin acids as a sizing agent are a mixture of amphipathic diterpenes comprising hydrophobic rings and a hydrophilic carboxyl group. Alum, a typical retention aid of rosin sizes, plays key roles in size retention and sizing appearance both in internal and surface sizing treatments [4].Effective rosin-alum sizing systems have attracted much attention as surface modification processes for cellulosic fiber-based materials. For that reason a great deal of effort has been directed toward such unique sizing systems. Those systems have been discussed on the basis of the chemical reaction between rosin acids and aluminum components [5][6][7][8][9], and the size retention [10-13] and distribution on paper sheets [14][15][16][17][18][19]. In our previous report involving emulsion rosin sizing with alum, it was shown that free size acids in their original form directly contributed to effective sizing appearance of paper sheets, while the aluminum salts of size components were either absent or were minor components [7][8][9]. Elemental analysis revealed that the aluminum species in alum-added paper sheets were present as oxidized compounds [20,21]. Consequently, an Department of Forest and Forest Products Sciences, Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan ( Present address:Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan)Abstract: The attractive force acting at a carboxyl group of a fatty acid/oxidized aluminum interface was precisely determined by atomic force microscopy (AFM). The correlation of the att...

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“…The relation of shear strength and effective hardness is given in Eq. (18). With the Timsit and Pelow's shear strength relation, the friction at the boundary layer is given as in Eq.…”

Section: Friction Calculationmentioning

confidence: 99%

“…The friction factor, f BL at the boundary layer of the asperities is used from Timsit and Pelow [18]. Timsit and Pelow gave the relation for the shear strength of stearic acid type lubricants for the various contact pressure.…”

Section: Friction Calculationmentioning

confidence: 99%

Modelling mixed lubrication for deep drawing processes

Karupannasamy

Hol

Rooij

et al. 2012

Wear

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a b s t r a c tIn Finite Element (FE) simulations of sheet metal forming (SMF), the coefficient of friction is generally expressed as a constant Coulomb friction. However in reality, the coefficient of friction at the local contact spots varies with the varying operational, deformation and contact conditions. Therefore, it is important to calculate the coefficient of friction under local conditions to better evaluate the formability of the product. Friction at a local scale is largely influenced by the micro-mechanisms at the asperity level like shearing in the boundary layer, ploughing and hydrodynamic lubrication. In this paper, a new mixed lubrication model is developed considering the aforementioned micro-mechanisms to better describe the friction conditions for deep drawing processes. Central to the friction prediction is the calculation of the lubricant film thickness and the contact area evolution based on the asperity flattening mechanisms. In deep drawing, asperity flattening can occur due to normal loading and stretching of the workpiece surface. Both flattening mechanisms are accounted in this model. The developed model is applied to an axi-symmetric cup drawing process. The results show that the coefficient of friction is not constant during the drawing process. Effects like asperity flattening and ploughing mechanisms increase the coefficient of friction under some conditions. Lubrication process decreases the coefficient of friction due to mixed lubrication effects.

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Shear Strength and Tribological Properties of Stearic Acid Films—Part I: On Glass and Aluminum-Coated Glass

Cited by 43 publications

References 0 publications

The sliding friction of thermoplastic polymer composites tested at low speeds

The sliding friction of thermoplastic polymer composites tested at low speeds

Specific Attraction at the Carboxyl Terminus of Fatty Acid/Oxidized Aluminum Interface for the Sizing Appearance of Fiber-network Materials

Modelling mixed lubrication for deep drawing processes

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