engleski

Application of material fatigue parameters estimation in analysis of rolling-sliding contact fatigue of gears

Determination of the expected fatigue life of components operating under rolling-sliding contact loading (gears, bearings, wheels) is quite challenging due to the complex stresses and strains in the material which are constantly changing during the loading cycles. Additional challenge is a lack of exact properties of the material that components are made of, which is especially pronounced in cases of surface heat-treated components in which values of material properties can vary significantly with the distance from the surface. Based on fatigue testing of involute spur gears made of differently heat-treated steel 42CrMo4 steel (normalized, quenched&tempered) reported in literature, fatigue life analyses of gear teeth flanks were performed using the previously proposed multiaxial fatigue life calculation model based on Fatemi-Socie critical plane based crack initiation criterion [1, 2] Since actual cyclic and fatigue material parameters were unavailable, they were estimated using the estimation method developed specifically for 42CrMo4 steel using monotonic properties of the materials which were reported in corresponding studies. Comparison of experimental and simulated fatigue lives (Figure 1), allowable contact stresses and morphol-ogies and candidate locations of fatigue damage initiation on teeth flanks, show very good agreement thus confirming the applicability of estimation of advanced material parameters in fatigue and failure analyses of actual components subjected to rolling-sliding contact loading.

fatigue life ; gears ; rolling‐sliding contact

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