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the surface and a rotational force on the ball. Frictional force is determined by finding the rotational speed of the ball using high speed photography or by measuring the force on the horizontal surface. Pressure in the contact is very high due to the large instantaneous force caused by the impact with the ball.
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consists of a stationary pin that is normally loaded against a rotating disc. The pin can have any shape to simulate a specific contact, but cylindrical tips are often used to simplify the contact geometry. The coefficient of friction is determined by the ratio of the frictional force to the loading
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consists of a ball which is impacted at an angle against a surface. During a typical test, a ball is slid on an angle along a track until it impacts a surface and then bounces off of the surface. The friction produced in the contact between the ball and the surface results in a horizontal force on
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which are the subject of the study of tribology. Often tribotesters are extremely specific in their function and are fabricated by manufacturers who desire to test and analyze the long-term performance of their products. An example is that of
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In most test applications using tribometers, wear is measured by comparing the mass or surfaces of test specimens before and after testing. Equipment and methods used to examine the worn surfaces include
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Jones, William R.; Poslowski, Agnieszka K.; Shogrin, Bradley A.; Herrera-Fierro, Pilar; Jansen, Mark J. (1999). "Evaluation of
Several Space Lubricants Using a Vacuum Four-Ball Tribometer".
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Tribometers are often referred to by the specific contact arrangement they simulate or by the original equipment developer. Several arrangements are:
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manufacturers who have spent considerable sums of money to develop tribotesters that accurately reproduce the motions and forces that occur in human
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A simple tribometer is described by a hanging mass and a mass resting on a horizontal surface, connected to each other via a string and pulley. The
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To determine the kinetic coefficient of friction the hanging mass is increased or decreased until the mass system moves at a constant speed.
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Höglund, Erik (March 1989). "The
Relationship Between Lubricant Shear Strength and Chemical Composition of the Base Oil".
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tribometers have been used to determine the shear characteristics of lubricants under high pressures such as is found in
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is the general name given to a machine or device used to perform tests and simulations of wear, friction and
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In both cases, the coefficient of friction is simplified to the ratio of the two masses:
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volume, between two surfaces in contact. It was invented by the 18th century
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Wei, D.P.; Spikes, H.A.; Korcek, S. (1999). "The
Lubricity of Gasoline".
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so that they can perform accelerated wear tests of their products.
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Instrument that measures friction and wear between surfaces
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344:and mechanical roughness testers.
321:{\displaystyle \mu \ =m_{H}/m_{T}}
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338:scanning electron microscopes
605:10.1016/0043-1648(89)90234-2
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133:Static Friction Tribometer
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465:Twist compression tester
236:{\displaystyle F=\mu N}
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153:quantities, such as
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141:Hydrogen Tribometer
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599:: 213–224.
444:valve train
422:Pin on disc
373:SRV or HFRR
359:Pin on disc
177:lubrication
173:tribotester
619:Categories
476:References
401:tribometer
356:Four ball
186:hip joints
165:scientist
147:tribometer
99:April 2010
69:newspapers
625:Tribology
551:137361318
470:Tribology
387:Twin disc
285:μ
228:μ
504:Archived
460:Abrasion
454:See also
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436:coatings
83:scholar
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246:Where
192:Theory
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416:gears
348:Types
163:Dutch
90:JSTOR
76:books
593:Wear
159:wear
62:news
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