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10-percent surface fatigue 9310 spur gears AISI 9310 GEAR AISI 9310 spur approximately 22 percent base stock bulk gear temperature cant carburized confidence number Cross section CVM AISI diameter was 8.89 dibasic acid ester Effect of Lubricant elastohydrodynamic failure index film thickness five lubricants gear lubricant gear oil gear teeth gear test apparatus gearbox gears was divided given in table Lewis Research Center lot of gears lubricant F lubricants have similar maximum Hertz stress MIL-L-23699 specification million stress cycles mineral oil NASA obtained with lubri pentaerythritol ester pentaerythritol-base stock pitch-line pressure-viscosity coefficients results for lubricant rolling-element fatigue section of typical shown in figure similar viscosity spall for lubricant spall is shown stock without sufficient sulfur surface pitting fatigue synthetic hydrocarbon test gears test lubricants test rig Tip relief torque typical fatigue spall United Aircraft Corp vacuum melted CVM viscosity and pressure-viscosity x-ray fluorescence Zaretsky