||Contact Rolling Fatigue Discussion
To determine if the development of a standardized contact rolling
fatigue (CRF) bench test has the support of potential end-users,
ASTM Subcommittee D02.L0.11 on Tribiological Properties of Industrial
Fluid Lubricants is sponsoring a CRF group discussion on June
28, at 3:00 p.m., in Seattle, Wash., during the summer meeting
of Committee D02 on Petroleum Products and Lubricants.
Stakeholders who utilize bearings, gears, hydraulic fluids and
lubricants in their industries are encouraged to attend, including
representatives of the American Gear Manufacturers Association.
The results of CRF are easy to recognize because they most commonly
produce visible surface failures such as pitting, spalling, or
cracking. Many test methods, both national standards and proprietary,
already exist to measure CRF. However, standardized bench tests
that accurately verify the contribution of lubrication in controlling
rolling contact wear remain open for debate. At last winters
meeting of Committee D02 in Reno, Nev., Subcommittee D02.L0.11
sponsored a discussion on the potential of developing a standard
bench test to verify the role of lubrication in controlling CRF.
Because pure rolling contact seldom exists in real-world applications,
each test method is unique in applying rolling motion. An example
of the complexity of a rolling contact application often taken
for granted is rolling element bearings. They are subject to skidding,
skewing and traction forces that induce varying degrees of sliding
with compressive and tensile stresses combined with the rolling
process. Another example is spur and helical gear sets where initial
tooth contact occurs as a sliding action (rubbing wear) with compressive
and tensile stresses. As the meshing approaches the pitch line,
sliding is reduced and a rolling action takes place. At a point
after the pitch line, sliding again occurs with tensile and compressive
stresses, and continues until the teeth disengage.
At the winter meeting, the group concluded that a standardized
method for verifying the role of lubrication in controlling CRF
could significantly contribute to increased component service
life and equipment reliability. It would have use with lubricants
for a broad range of consumer, commercial and industrial hydraulic,
pneumatic, mechanical, electromechanical and process applications.
It could also be used by component manufacturers to improve overall
Anyone interested in participating in the development process
is encouraged to provide comments and guidance at this meeting.
Contact (ASTM D02.L0.11 chairman) Mike Anderson, Falex Corporation, 1020 Airpark Drive, Sugar Grove, IL 60554
(630/556-3669; fax: 630/556-3679). //
Copyright 2000, ASTM