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Monday, July 6, 2020 | History

2 edition of Plastic deformation at surface during unlubricated sliding found in the catalog.

Plastic deformation at surface during unlubricated sliding

Takashi Yamamoto

Plastic deformation at surface during unlubricated sliding

by Takashi Yamamoto

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  • 34 Currently reading

Published by National Aeronautics and Space Administration, Scientific and Technical Information Branch, For sale by the National Technical Information Service] in Washington, D.C, [Springfield, Va .
Written in English

    Subjects:
  • Plastics -- Deterioration.,
  • Lubrication and lubricants.,
  • Mechanical wear.,
  • Steel, Stainless -- Fatigue.

  • Edition Notes

    StatementTakashi Yamamoto and Donald H. Buckley.
    SeriesNASA technical paper -- 2036.
    ContributionsBuckley, Donald H., United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch.
    The Physical Object
    Pagination17 p. :
    Number of Pages17
    ID Numbers
    Open LibraryOL17829383M

      1. Introduction. A central development in modern tribology, beginning with the pioneering work of Bowden & Tabor [], Holm [] and Ernst & Merchant [] is the recognition of the role of plastic deformation of asperities in understanding sliding friction and wear in metal–metal has enabled a micromechanical characterization of friction in the adhesive and abrasive wear regimes, and Cited by: Plastic deformation occurs by the following modes: 1. The surface of a crystalline solid which has been polished, Fig. (a) and then plastically deformed, generally gets covered with one or, more sets of parallel lines, Fig. (c). At high magnifications, these ‘slip lines’ are found to be steps on the surface [ (b)] formed by.

    uncertain but the resultant surface was very smooth. The purpose of the present investigation is to evaluate the unlubricated tribological properties of Nitinol surface treated by gas nitriding and plasma nitriding. During the course of this investigation, there was a File Size: 6MB. In physics and materials science, plasticity, also known as plastic deformation, is the ability of a solid material to undergo permanent deformation, a non-reversible change of shape in response to applied forces. For example, a solid piece of metal being bent or pounded into a new shape displays plasticity as permanent changes occur within the material itself.

    The unlubricated sliding wear and friction behavior of a wrought cobalt-chromium alloy against sintered Al 2 O 3, ZrO 2-toughened Al 2 O 3, MgO-partially-stabilized ZrO 2, and hot-pressed Si 3 N 4 ceramic counterfaces has been investigated. Both untreated (baseline) and surface-borided conditions of alloy 6B disks were by: The boundary lubrication and dry friction of plain bearings at different work temperature are unable to be avoided under the start and stop condition. The poor lubrication is one reason of bearing broken. In order to improve the tribological properties and select the best treatment for different bearings used at different temperature, the studies of different treatment technologies are Author: Jun Cao, Liang Qin, Aibing Yu, Haibo Huang, Guoping Li, Zhongwei Yin, Huiyu Zhou.


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Plastic deformation at surface during unlubricated sliding by Takashi Yamamoto Download PDF EPUB FB2

Plastic deformation at surface during unlubricated sliding. Washington, D.C.: National Aeronautics and Space Administration, Scientific and Technical Information Branch ; [Springfield, Va.: For sale by the National Technical Information Service], Plastic deformation at surface during unlubricated sliding / By Takashi Yamamoto, Donald H.

Buckley and United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch. Abstract "October " category Distributed to depository libraries in es bibliographical.

The plastic deformation and wear of stainless-steel surface slid against an aluminum oxide rider were observed by using a scanning electron microscope and an optical microscope.

Experiments were conducted in a vacuum of Pa and in an environment of Pa chlorine gas at 25 : D. Buckley and T. Yamamoto. The plastic deformation and wear of a stainless steel surface sliding against an aluminum oxide rider with a spherical surface (the radius of curvature: cm) were observed by using scanning electron and optical : T.

Yamamoto and D. Buckley. Coupled with the large tangential traction arising from a high COF of around under unlubricated conditions, severe shear strain would occur at the surface of the wear track.

Thus sliding wear is itself a severe surface plastic deformation process and would induce structural and property changes inside the Cited by: Severe plastic deformation (SPD) during friction and wear was studied over a long period of time. The dislocation structure and hardening of surface layers during mainly unlubricated friction were analyzed,.Cited by: 6.

Steady-state plastic deformation of the surface layer induced by the rolling and sliding of a rigid cylinder is investigated using ideal plastic plane strain theory taking into consideration contact friction. The plastic region and length of the contact arc related to the forces and the moment applied to the cylinder are by: 6.

Sliding wear can be characterized as a relative motion between two smooth solid surfaces in contact under load, where surface damage during the translational sliding does not occur by deep surface grooving because of penetration by asperities or foreign particles.

The surfaces may be of metallic or nonmetallic nature, and lubricated or unlubricated. Most theories of sliding friction have emphasized surface roughness or adhesion. In some cases plastic deformation has been invoked to account for energy dissipation.

After a brief review of published explanations of friction, a new model is described for the source of friction during the steady state sliding Cited by: Sliding Surface. Sliding surfaces are always progressive during the sliding process, due to the friction and wear processes.

The friction for two sliding surfaces with contact between the surface asperities can be related to elastic and plastic deformation. In this approximation, each contact between asperities would carry the corresponding.

The hardness of thin surface layers saturates during repeating sliding of Cu that is close to the hardness of nanocrystalline Cu produced by different severe plastic deformation (SPD) processes.

Oxygen-free high-conductivity (OFHC) copper plates (Goodfellow, Bad Nauheim, Germany) with a purity higher than % were used for the unlubricated sliding tests.

The plastic deformation caused Author: C. Haug, F. Ruebeling, A. Kashiwar, A. Kashiwar, P. Gumbsch, P.

Gumbsch, C. Kübel, C. Kübel, C. Grei. For the rough Matrix steel where the sliding track was first formed in unlubricated sliding, aluminium fills much of the grooves already at the first unlubricated passage and this process continues during the subsequent passages.

Obviously, although this caused much deformation and high friction in the unlubricated condition, addition of the Cited by: 2. The governing deformation mechanisms during metal stamping are dis-location slip and twinning, as verified by the deformation mechanism map shown in Figure 6.

Severe Plastic Deformation Severe Plastic Deformation (SPD) is a method of processing metals to create bulk material comprised of nanostructures. It is an appeal-File Size: KB. The prevailing wear mechanism in case of dry rolling/sliding contact is undoubtedly ratcheting, which is, among other, responsible for plastic deformation accumulation below contact surface.

The plastic deformation process of the surface layer’s microroughnesses by a sliding tool with Prandtl’s high contact friction in which the plastic shear occurs in the direction of the slide of the tool, with the microroughnesses’ depressions being filled and a decrease of the surface Cited by: 1.

The influence of surface oxidation and sliding speed on the unlubricated wear of stainless steel at low load. Wear, 91 – Google Scholar | Crossref | ISICited by: The wear process under unlubricated sliding conditions can be well imderstood by presenting a reasonable explanation based on the concept of adhesion at the interface during the sliding process.

The mechanism for tearing away the surface layer from the contact area and forming the sliding track contour is explained by assuming the simplified. The applied load was N, and the tests were all run for a total sliding distance of e changes and surface deformation resulting from sliding were characterized with the use of scanning.

Pallet Sliding. Chapter Comparison is made of the plastic deformation due to the friction of a sapphire ball, rubbing in air on the principal faces of four hexagonal metals of different.

The energy dissipated during continuing plastic deformation can account for the values of friction coefficients typically measured during the unlubricated sliding of ductile improve.on the surface during subsequent deformation.

Oil trapped in the pits can be drawn out due to the sliding between the roll and strip, as illustrated in Figure Further details of the MPHL mechanism are given in sectionwhile section describes work on boundary lubrication. Finally the significant effect of transfer films formed on rollCited by: 7.According to Bowden & Tabor (), friction between unlubricated metals is due to shearing of junctions formed by adhesion between minute asperities on the sliding surfaces.

The theory is elaborated in this paper to give a clearer picture of how the stresses and deformations in .