Abstract
Abstract This paper deals with the bending strength and the size effect of carburized fine module gears. The fine module gears (m = 1.0–1.5) are made of a low-carbon alloy steel, and they are carburized to have various effective case depths. The bending fatigue tests are performed for these gears. The test results show the validity of the AGMA recommendation for the effective case depth. The experimental formulas of bending strength are estimated from the comparison with the strength of the gears of m = 5. In order to make clear the size effect, a method of fracture mechanics based strength evaluation is introduced and applied to the fatigue test results. The fatigue life is assumed to be the crack propagation process, and the maximum initial length of crack is calculated from the fatigue strength. The relation between this crack length and the thickness of non-martensitic layer at the fillet is obtained, and the size effect is discussed with the relation to the thickness of the non-martensitic layer.
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