GSD-06 INFLUENCE OF RESIDUAL STRESSES ON TOOTH ROOT BENDING STRENGTH OF CASE HARDENED GEARS(GEAR STRENGTH AND DURABILITY, INCLUDING GEAR MATERIALS AND HEAT TREATMENT TECHNIQUES)

概要

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According to the state of the art, case hardened gears have residual compressive stresses in the surface layer. In the tooth root fillet area these stresses are generated mostly by heat treatment and eventually by additional mechanical cleaning or shot peening processes. Residual stresses together with load induced stresses and material resistance influence the tooth bending strength of a gear. Within a research project the influence of different residual stress conditions on tooth root strength was investigated. A factor "YRS" was defined on the basis of experimental results to take into consideration the influence of residual stresses on tooth root fatigue strength for the simplified calculation method according to the standards DIN 3990 / ISO 6336. After further theoretical studies on stress state and fracture mechanics a local concept model was developed for evaluate damage behaviour and showed a good consistency with the experimental results.
2009-05-13