Tribology of Interface Layers

Tribology of Interface Layers

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Features

  • Shows how submicron powder lubricants share similar characteristics with conventional fluid films
  • Explains how, instead of being harmful, debris produced by wear can actually be made to act as a lubricant
  • Explores the presence of similar tribological modalities in different modes of operation
  • Discusses the new technology of powder lubrication and its dependence on hydrodynamic lubrication
  • Offers experimental data on the rheology of triboparticulate films, as well as design guidelines regarding power lubrication

Summary

To this point, the field of lubrication has been conceptualized using several noncontiguous modes of operation — boundary, fluid-film, and dry and solid lubrication. Engineers and analysts have long had to deal with old evidence that many tribological devices, such as flat surface and centrally pivoted sliders, can act as viable bearings — contradicting basic hydrodynamic theory.

Tribology of Interface Layers introduces a new concept wherein disparate modes are shown to actually be particular phases of a tribological continuum spanning a wide array of material lubricants. The author details these phenomena and presents a novel definition of lubricants as intermediate layers.

Explores the phenomenon of continuum spectrum as applied to new powder lubrication technology

The book illustrates that contrary to previous understanding, the various lubrication modes — from dry to hydrodynamic to powder lubrication — all overlap each other within a tribological spectral continuum. It also elucidates the fact that bearings, seals, dampers, and similar devices using submicron powder lubricants possess quasi-hydrodynamic characteristics akin to conventional fluid films. Similarly, powder films possess quasi-hydrodynamic features that enable them to act as conventional fluid film bearings. The field of tribology has traditionally been presented in terms of disparate regimes, but this method of classification lacked sufficient rigor. This volume explains that characterization and treatment of any one regime may require the simultaneous accounting of several different modalities that are present in a particular mode of operation. Based on experimental and theoretical work, this text shows how the interdependence of powder and hydrodynamic lubrication exemplifies that perpetuity in tribological processes.

Author Hooshang Heshmat was on hand for a book signing at the 2010 STLE Meeting.

Dr. Heshmat was the 2007 recipient of the Mayo D. Hersey Award, bestowed on an individual in recognition of distinguished and continuous contributions over a substantial period of time to the advancement of the science and engineering of tribology.

Check out Dr. Heshmat's wikipedia page.

Table of Contents

Historical Perspective

Prehistory to the Renaissance (5000 BC–1450 AD)

The Renaissance (1450–1600)

The Preindustrial and Industrial Eras (1600–1850)

The Scientific Era (1850–1925)

The Space Age (1945–Present)

The Rheology of Interface Layers

General Considerations

Newtonian Fluids

Viscoelastic Substances

Two-Phase Systems

Powder Films

The Phenomenology of Lubrication

Contradictions to Hydrodynamic Theory

Triboparticulates as Lubricants

General Observations

Direct Contact–Hydrodynamic Continuum

Dry Friction and Wear

Coatings and Dry Lubricants

Boundary Lubrication

Elastohydrodynamic Lubrication (EHL)

Continuum Aspects

Hydrodynamic–Solid Films Continuum

Hydrodynamic Films

Rheodynamic Lubricants

Triboparticulate Layers

Granular Flow Layers

Continuum Aspects

Experimental Performance of Powder Layers

The Morphology of Powders

Thermodynamic Properties

Rheological Characteristics

Powder Flow and Velocity

Tribological Qualities of Powders

Powder-Lubricated Devices

Sliders

Journal Bearings

Dampers

Piston Rings

Theory of Powder Lubrication

Analysis

Slider Bearings

Crowned Sliders

Granular Films

Continuum Approach

Discrete Particles Approach

The Tribological Continuum

Historical Overview

Overlapping Tribological Regimes

The Tribological Continuum

Index

Author Bio(s)