GSD-10 A MULTIAXIAL FATIGUE APPROACH FOR THE CALCULATION OF THE PITTING STRENGTH OF CASE HARDENED GEARS(GEAR STRENGTH AND DURABILITY, INCLUDING GEAR MATERIALS AND HEAT TREATMENT TECHNIQUES)

概要

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The paper presents a model of the pitting damage in case hardened spur gears that aims at the assessment of the contact fatigue (pitting) limit. The calculation method is based on the local comparison of an equivalent stress level, computed by the use of a multiaxial fatigue criterion, and an allowable stress for heat treated gear materials. The complex surface and subsurface stress field generated by the contact loads is calculated including the influence of friction and the stresses induced by thermal effects. The effects of surface roughness on the contact load distribution and, therefore, on the contact stress field is also discussed. The influence of gear heat treatment processes on the material strength is taken into account assuming a variation of the material strength over depth and the presence of a residual stress field. The material strength is assessed by the Liu-Zenner multiaxial fatigue criterion taking into account the non-proportional stress path which undergoes the gear material during meshing. The proposed model is compared with results obtained using the ISO calculation method.
一般社団法人日本機械学会の論文
2009-05-13