Table 7:
Surface fatigue lives of case-carburized AISI 9310 gear pairs tested in the NASA Glenn Research Center gear fatigue test apparatus. All tests conducted using gears of the same geometry, same heat treat specification, same lubricant, same testing speed of 10 000 r.p.m., and same testing methods.
aCVM indicates consumable-electrode vacuum-melted; VIM-VAR indicates vacuum-induction-melted + vacuum-arc-remelted
bThe 10-percent and 50-percent lives are those obtained by fitting the test data to two-parameter Weibull distributions. The lives are system lives, the system being a pair of gears.
cIndicates the number of failures out of the number of tests. The durations of tests suspended without failure were in the range 275–330×106 cycles.
