ASTM D3704 Test Method for Wear Preventive Properties of Lubricating Greases
ASTM D3704 Standard Test Method for Wear Preventive Properties of Lubricating Greases Using the (Falex) Block on Ring Test Machine in Oscillating Motion
1. Scope
1.1 This test method covers the determination of wear properties of lubricating greases by means of the Falex block-on-ring friction and wear test machine.
1.2 The values stated in SI units are to be regarded as standard except where equipment is supplied using inch-pound units and would then be regarded as standard. The metric equivalents of inch-pound units given in such cases in the body of the standard may be approximate.
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:
D1403 Test Method for Cone Penetration of Lubricating Grease Using One-Quarter and One-Half Scale Cone Equipment
D2714 Test Method for Calibration and Operation of the Falex Block-on-Ring Friction and Wear Testing Machine
3. Terminology
3.1 Definitions:
3.1.1 coefficient of friction, µ or f, n - 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/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, n - 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, n - the coefficient of friction under conditions of macroscopic relative motion between two bodies.
3.1.4 wear, n - damage to a solid surface, generally involving progressive loss of material, due to relative motion between that surface and a contacting substance or substances.
