Solid Film Lubricants on
Fretting Fatigue Strength of Aluminum Alloy
Kawaguti Mizuki
Mechanical &
Electrical Engineering on Advanced Engineering Course Numazu National College
of Technology.3600 Ooka,Numadu-shi,3600 Shizuoka-ken . 410-8501
The
plain fatigue and fretting fatigue tests of aluminum alloy (JIS A 7N01) ware
carried out using a servo-hydraulic fatigue test machine with a capacity 98kN
under a stress ratio R of 1 at frequencies ranging from 150Hz.Fretting was
inducted by clamping a pair of bridge type pads both sides of the specimen,
using a proving ring.The material used foe the
specimen was an aluminum alloy, and the contact pad was steel alloy (SAPH 440).
The cramping pressure was adjusted before and during the tests to give a constant
value of 50MPa.The plain fatigue strength of the specimen with wet blast was
higher than that without treatment. The fretting fatigue strength treated wet
blast was higher than that without treatment.The
plain fatigue limit (at 107 cycles) of the specimen without
treatment was 160MPa, and that of the specimen with wet blast and alumite ware 200MPa and 80MPa.The fretting fatigue limit of
the specimen without treatment, with wet blast and alumite
ware almost 40MPa.However, the fretting fatigue strength of the specimen with defric coating was significantly high due to lower
tangential force coefficient.In adittion,
the plain fatigue and fretting fatigue tests of aluminum alloy (JIS A 7N01)
ware carried out using a fatigue testing machine with SEM (Scanning Electon Microscope) with a capacity 98kN under a stress
ratio R of ?1 at frequencies ranging from 0.1Hz to 20Hz. And fretting fatigue
cracks of the specimen were observed in-situ using a fatigue testing machine
with SEM (Scanning Electon Microscope).
Key Words: Strength of
Materials, Fatigue, Fretting Fatigue, Wear, Lubricant Solid Film