破壊力学に基づく浸炭歯車の強度評価に関する研究 : 第3報, 浸炭歯車の疲労き裂進展

概要

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Fatigue test results performed by the authors indicated that the residual lives of carburized gears after observation of fatigue crack are rather long. This suggests to us the significance of research on crack growth in the case layer for the purpose of establishing a reliable and precise design of carburized gears. In this paper, a method is developed to simulate the fatigue crack growth in a carburized gear tooth considering the effect of residual stress and the unevenness of hardness in the case layer. The crack growth is also measured by a crack gauge, and the validity of the method is confirmed. In the case of heavy load, the crack growth rate increases greatly, because of the brittleness of case layer, and the rate reduces and becomes the same as the crack growth rate of uncarburized materials after penetration through the case layer.
1991-03-25