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Keywords: friction
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eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2022
ISBN: 978-0-8031-7714-7
... Conditioning monitoring of lubricants in operation usually considers different physical and chemical quantities but not functional properties. The identification of the induction time or offset point (“cliff” or “jumping-off point”), after which wear and friction will increase, and thus improve...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2022
ISBN: 978-0-8031-7714-7
... The term “lubricity” is used to assess a fuel's ability to reduce the friction between contact surfaces under applied loads. Furthermore, the reduction of sulfur (a natural lubricating agent) in diesel fuel oil by the U.S. Environmental Protection Agency makes it necessary to treat these fuels...
eBook Chapter
Series: ASTM Manuals
Publisher: ASTM International
Published: 2019
ISBN: 978-0-8031-7089-6
... stability or the content of ester-based oils in hydraulic systems. hydraulics ester fluid oil ASTM DIN alcohol fatty acid biodegradable lubrication wear friction tribology 553 Chapter 15 | Environmentally Acceptable Ester-Based Hydraulic Fluids Hubertus Murrenhoff,1 Andreas Remmelmann,2...
eBook Chapter
Series: ASTM Manuals
Publisher: ASTM International
Published: 2019
ISBN: 978-0-8031-7089-6
... additive lithium complex calcium sulfonate elastomer complex dropping point semisolid lubricant soap shear thinning thickener wheel bearing ball bearing fluoroether penetration consistency lubricant friction wear tribology Chapter 22 | Lubricating Greases Rajesh Shah1 and William...
eBook Chapter
Series: ASTM Manuals
Publisher: ASTM International
Published: 2019
ISBN: 978-0-8031-7089-6
... is also discussed. The structure of this chapter is to first address basic principles involved in friction. After friction, wear, and principles of fluid lubrication are discussed. The last section of this chapter provides an overview of additive chemistry in the formulation of lubricants. friction...
eBook Chapter
Series: ASTM Manuals
Publisher: ASTM International
Published: 2019
ISBN: 978-0-8031-7089-6
... This chapter provides various methods to evaluate the friction and wear properties of lubricants and materials. If friction and wear can be easily studied and controlled, then the engineer can select materials and lubricants with a high degree of confidence. Many laboratory tests are used...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2015
ISBN: 978-0-8031-7627-0
... Unintended micromotions causing fretting and corrosion within the modular head-neck junction of total hip replacement are governed by hip joint contact forces as well as by the frictional moments during articulation. Frictional moments typically are measured in unidirectional sliding tests...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2015
ISBN: 978-0-8031-7625-6
... was developed for HMAC paving systems on waterproofing membranes on concrete bridge decks but is adaptable to other applications with similar shear loading concerns. shear bond adhesion friction waterproofing membrane bridge paving asphalt hot mix asphalt (HMA) hot mix asphaltic concrete (HMAC...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2012
ISBN: 978-0-8031-7541-9
... Pavement texture is defined by the irregularities on a pavement surface that deviate from an ideal, perfectly flat surface. Texture influences many aspects of road safety and comfort, including friction, smoothness, splash and spray, rolling resistance, and numerous others. The focus...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2003
ISBN-10: 0-8031-3454-1
ISBN: 978-0-8031-3454-6
... and, to a lesser extent, the test surface. Insights from this paper may provide a better way of characterizing slip resistance than the commonly used averaged coefficient-of-friction (COF) value that would be compared against single-value pedestrian-friction safety thresholds. Specifically, we have derived...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2003
ISBN-10: 0-8031-3465-7
ISBN: 978-0-8031-3465-2
... of the couple. The shear stress was related to the sliding distance. A modified coefficient of friction was introduced and found to express correctly the decrease in shear stress with increase in contact pressure. In addition, the effect of clamping load on the compressive displacement of the rod and sleeve...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2003
ISBN-10: 0-8031-3465-7
ISBN: 978-0-8031-3465-2
... are performed at a low frequency (0.25 Hz). In the second part of this work attention is focused on modeling the most important damage mechanism under room temperature conditions. Initial computation of crack growth rates in TMC, assuming interfacial friction being the only stress transfer mechanism (i.e...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2003
ISBN-10: 0-8031-3456-8
ISBN: 978-0-8031-3456-0
...-by-step methodology is used here to analyze the influence on crack initiation and propagation of the local fretting regime and the associated mechanical stress-strain state. crack initiation propagation fretting friction crack branching Marie-Christine Dubourg t Local Fretting Regime...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2003
ISBN-10: 0-8031-3456-8
ISBN: 978-0-8031-3456-0
... of predicted and observed experimental crack nucleations. The paper concludes with suggested future work aimed at experimentally explicating the frequency and variable amplitude factor effects in fretting fatigue. high frequency fretting fatigue life prediction friction John F. MatlikI and Thomas...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2003
ISBN-10: 0-8031-3456-8
ISBN: 978-0-8031-3456-0
... sensitive to the shape of the contacting surfaces and the coefficient of friction. To have an understanding of fretting at the contacts in turbine engine components, it is important to simulate similar temperature, load, and contact conditions in the laboratory and develop tools to analyze the contact...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2001
ISBN-10: 0-8031-2883-5
ISBN: 978-0-8031-2883-5
... Lubrication characteristics on the sliding surfaces between piston and cylinder in a piston pump and motor with running-in have been investigated. The friction characteristics on the sliding surfaces of the friction test machine have been examined with the use of pin-on-V-block before running...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2001
ISBN-10: 0-8031-2883-5
ISBN: 978-0-8031-2883-5
.... hydraulic failure friction lubrication wear wear debris condition-based maintenance Brian J. Roylaneel Wear and Wear Debris in a Changing World Reference: Roylance, B. J., "Wear and Wear Debris in a Changing World," Hydraulic Failure Analysis: Fluids, Components, and System Effects, ASTM STP 1339, G...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2001
ISBN-10: 0-8031-2883-5
ISBN: 978-0-8031-2883-5
... to achieve the goal specially coated material pairs and their surface finish have to be tested with the objective of decreasing friction and wear. To reduce the expense of testing, the selection of materials is conducted with a special model. Two ring-shaped test bodies are pressed against each other...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2001
ISBN-10: 0-8031-2883-5
ISBN: 978-0-8031-2883-5
... such as bronze/steel. Improvements are achieved by adding carbon; however, the results are highly dependent upon the application method. Coatings that are graduated like HfCg show a low friction coefficient and wear rate. In addition to the tribological qualities of the coatings, the durability as well...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 2001
ISBN-10: 0-8031-2883-5
ISBN: 978-0-8031-2883-5
... for modeling system of friction and wear, especially the influence of lubrication, time and material of the seal. rubber yellow metal wear friction stick-slip water diffusion copper Manfred VStter 1 and Olaf Schultz2 Influence of Lubrication on Wear and Friction on O-Rings in Contact...