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Abrasive wear
Material removal by micro cutting from hard surface asperities or hard particles that have embedded themselves into a soft surface that plough grooves into the opposing softer surface. Abrasive wear is sometimes subdivided into two-body and three-body abrasive wear. In three-body wear hard particles are free to roll and slide between the two, perhaps dissimilar, sliding surfaces.

Compounds that enhances some property of, or imparts some new property to, the base oil. The more important types of additives include anti-oxidants, anti-wear additives, corrosion inhibitors, viscosity index improvers, and foam suppressants.
  Adhesive wear
is often referred to as galling, scuffing, scoring, or seizure. Material transfer between two surfaces, or loss from either surface, due to localized bonding between the contacting asperities.
  Aerostatic bearings, see "Gas bearings".
  AF-coating see "Solid lubricants".
Bonded films to be applied like paints with high load-carrying capacity and low shear strength.

BL, Boundary Lubrication, see "Stribeck curve".

  Bleeding, see "Grease lubrication"

Camshaft failure mechanism
Abrasive wear, scuffing, plastic deformation, pitting

  Compound is a blend of ingredients tailored for particular characteristics required to optimize performance in some specific service. A mixture of base materials, chemicals, reinforcements, solid lubricants etc.
  Consistency, see "Grease lubrication"

Damage analysis, see "Failure mode classification"

Elasto Hydrodynamic Lubrication
(EHD or EHL) Lubrication model modified to take into consideration the elastic properties of the bearing material and the viscosity increase of the lubricant under high pressure
  Elastomer is synonymous with rubber like materials. Both plastics and elastomers are polymers. Elastomers are defined by their properties (ASTM), i.e. a) it must not break when stretched approximately 100% and b) after being stretched 100%, held for 5 minutes and then released, it must retract to within 10% of its original length within 5 minutes after release.
  Engine lubrication system, see "Lubrication"
  EP-bearings, see "Gas bearings" or "Hydrostatic bearings".
  Erosive wear, where hard particles carried in a gas or liquid stream strike a surface.
  Failure mode classification for machine elements (ISO)
  False Brinelling, fretting wear in concentrated contacts. In bearings this localized wear appears as a depression in the race, however caused by oscillation.
Calculation of tightening torque, metric thread
Flash temperature
  Flexure hinges
Flexure hinges hold several advantages over classical rotational joints, including no friction losses, no need for lubrication, no hysteresis, no clearance, no wear.
  Formula one racing
How is it possible that one team experiences several engine blow-ups in one season while its competitor almost always manages to reach the finishing line?
  Four Ball EP/AW Tester
Test apparatus for lubricants: Extreme pressure additives, anti-wear
  Fretting wear, is the wear that occurs by minute oscillation.
  Friction measurement

Gas Bearings
Externally Pressurized, EP-Bearings, gas lubricated, aerostatic bearings

  Gear Calculation
Surface durability and tooth-root stress of spur gears acc. ISO 6336
  Graphite see "Solid lubricants".
Graphite is best suited for lubrication in a regular atmosphere. Water vapor is...
  Grease lubrication
  Hard disk
The separation between the magnetic read/write element and the hard disk during operation, known as the flying height...
  Head disk interface
Calculation of elastic deformation in concentrated contacts.
  HL, Hydrodynamic Lubrication, see "Stribeck curve".

History of Science Friction
Leonardo Da Vinci (1452-1519) was one of the first scholars to study friction systematically. He realized how important friction is for the workings of machines. He focused on all kinds of friction and drew a distinction between sliding and rolling friction>>

  How to
Frequently asked questions.
  Hybrid bearings
Steel roller bearing with ceramic balls.
  Hydrodynamic Lubrication
History; Tower, Reynolds, Sommerfeld...
  Hydrostatic bearings
Externally Pressurized bearings, liquid lubricated
  Hydrostatic Lock Gate Bearings
ISO 286-2 tolerances for shafts
ISO 286-2 tolerances for holes
Journals, see "Tribology Journals"


Leonardo Da Vinci (1452-1519), see "History of Science Friction"
  Limiting PV-Value
Measuring the load capacity of plastic journal bearings.
  Lubrication, engine lubrication
The reason why, despite of frequent replenish of oil, oil change remain essential or even become more essential.
  Material properties

Michell Tilting Pad Bearing

  ML, Mixed Lubrication, see "Stribeck curve"
  Molybdenum Disulphide see "Solid lubricants".
MoS2 lubrication performance often exceeds that of graphite and is effective in...
NLGI, see "Grease lubrication"

  Pin-on-ring tribometer
see also "Test equipment"
Both plastics and rubbers are polymers.
Porous bearings, see "Sintered Bearings"
  Precision and micro systems engineering, see "Gas bearings".
  PTFE see "Solid lubricants" and "Polymers".
  Pumpability is the ease with which a pressurized grease can flow through channels.
  Rail contact
Shakedown, Ratcheting, Rolling contact fatigue
  Ratcheting behavior, see "Rail contact"
  Rubber includes natural rubber and synthetic rubber, i.e. rubber like materials or elastomeric materials, see "elastomers"

Rubber Stave or Sleeve bearings
Hydrodynamically water lubricated. Main application is in propeller
shaft bearings, cutter heads and immersed pump bearings.

  SAE = Society of Automotive Engineers, see "Viscosity"
  Shakedown, elastic shakedown, plastic shakedown, see "Rail contact".

Sintered bearings

  Slumpability, or feedability, is the ability of grease to be drawn into (sucked into) a pump.
  Solid Lubricants
Graphite and molybdenum disulfide (MoS2) are the predominant materials used as solid lubricant. Other components that are useful solid lubricants include...
  Stave bearings, see "Rubber stave bearings"
  Stribeck curve
  Test equipment
  Tribology is defined as the science and technology of interacting surfaces in relative motion, and embraces the study of friction, wear and lubrication.

Tribology Journals




Viscosity Index, SAE-classification, dynamic viscosity, kinematic viscosity...

  Wear rate
Equation to compute the wear rate (Archard,1953).
  Wear mechanisms
Abrasive wear, Adhesive wear, Corrosive wear, Surface Fatigue, erosion...

Wire Drawing
In drawing wire, the required deformation is accomplished by drawing the wire through the conical bore section of the die, hereby reducing the diameter through plastic deformation. During deformation, a thin film of lubricant between wire surface and die surface is essential to minimize friction, to reduce die wear, and to keep the die cool >>