On the Fictitious Grease Lubrication Performance in a Four-Ball Tester

The extreme pressure (EP) behavior of grease is related to its additives that can prevent seizure. However, in this study following ASTM D2596 four-ball test method, the EP greases was modified without any changes additive package. A tester with position encoders and variable frequency drive system used control speed ramp up time or delay motor demonstrate higher weld load lower friction were fictitious. tenth a second had showed an increase from 7848 N 9810 for X 6082 Y. Further 0.95 s passed maximum possible mechanism be rise local temperature reach melting point steel required full seizure welding, theoretically attributed heat loss as ramp-up increased. Furthermore, increased corrected This resulted fictitious low decrease surface roughness at load. suggests critical factor should further investigated by manufacturers, use behavior.