ASTM D2981 Test Method for Wear Life of Solid Film Lubricants in Oscillating Motion
1. Scope
1.1 This test method covers the evaluation of wear life of a bonded solid film lubricant under oscillating motion by means of a block-on-ring friction and wear testing machine.
1.2 The values stated in either inch-pound units or SI (metric) units are to be regarded separately as standard. Within the text the SI units are shown in brackets. The values stated in each system are not exact equivalents, therefore each system must be used independently of the other. Combining values of the two systems may result in nonconformance with the specification.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents
2.1 ASTM Standards:
D2714 Test Method for Calibration and Operation of the Falex Block-on-Ring Friction and Wear Test Machine
3. Terminology
3.1 Definitions:
3.1.1 coefficient of friction, µ or f - in tribology, the dimensionless ratio of the friction force (F) between two bodies to the normal force (N) pressing these two bodies together.
µ or f = (F/N)
3.1.1.1 Discussion - A distinction is often made between static coefficient of friction and kinetic coefficient of friction.
3.1.2 friction force - the resisting force tangential to the interface between two bodies when, under the action of an external force, one body moves or tends to move relative to the other.
3.1.3 kinetic coefficient of friction - the coefficient of friction under conditions of macroscopic relative motion between two bodies.
3.1.4 wear - damage to a solid surface, generally involving progressive loss of material, due to relative motion between that surface and a contacting substance or substances.
