破壊力学に基づく浸炭歯車の強度評価に関する研究 : 第1報, 残留応力の影響を考慮した応力拡大係数

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A method is presented to calculate the stress intensity factor of carburized spur gear teeth considering the effect of residual stress in the case. The crack at the fillet is assumed to be straight along the face width and a two-dimensional finite element method is used for the calculation. The residual stress is estimated based on the assumption that the main cause of residual stress is the volume difference between the case and core due to the martensitic transformation in cooling. The result demonstrates that the stress intensity factor is consideraly influenced by the residual stress. especially for the loading condition corresponding to the fatigue strength of gears. The present method is applied to the prediction of the position of crack initiation by assuming the existence the initial short cracks in the decarburized layer along the fillet.
1989-06-25