Prediction Of The Tooth Root Bending Fatigue Strength Of Sintered Gears By Using Of The New Developed FKM-Guideline "Analytical Strength Assessment Of Components Made Of Sintered Steels"

For decades, predicting the fatigue strength of sintered components was the speciality of a few fatigue and sintered steels experts who had their own pool of fatigue parameters and corresponding Woehler-curves. The increasing usage of cost-efficiently manufactured sintered components for safety-relevant applications and the associated interest of OEMs in a clearly structured and comprehensible guideline made it necessary to derive an FKM-Guideline which covers the special features of sintered steels, such as the influence of the density and the heterogeneous microstructure as well as the beneficially low notch sensitivity. This paper presents the main fatigue strength assessment steps and applies the new developed FKM-Guideline "Analytical strength assessment of components made of sintered steels" on own-derived experimental tooth root bending fatigue strength data. It is shown that a sufficiently accurate analytical fatigue strength assessment can be realized with only two parameters, namely the Vickers hardness and the density.