Abstract
This article is devoted to the analysis methods for assessing the load capacity of gears hardened by surface chemical-thermal treatment (CTT), which are characterized by structural and chemical heterogeneity. The leading type of failure is determined by several factors, the main of which are the surface and deep layer properties of the material, which fundamentally differ in the energy and structural state. Intercrystalline fracture mechanisms predominate in the surface layers and transcrystalline in the core. For these cases, the classical failure criteria of Mohr, Tresca, and Mises lead to significant errors. Therefore, the bearing capacity of the layer component is investigated by the generalized criterion of the limit state of the Pisarenko-Lebedev structurally inhomogeneous material, considering changes in its plastic properties due to surface hardening. The reliability of predicting the level of bearing capacity of surface hardened steel parts, such as gears, was significantly improved. The influence of the plasticity parameter on the level of bearing capacity for various types of CTT is estimated. Calculations using the presented model show that for alloy steels with a Ni content up to 1%, the safety coefficient can be limited to 1.2, which will increase the bearing capacity by 25–27%.
Highlights
This article is devoted to the analysis methods for assessing the load capacity of gears hardened by surface chemical-thermal treatment (CTT), which are characterized by structural and chemical heterogeneity
For high-quality gearboxes with traditional involute gearing that are manufactured and operated in normal operating conditions, the primary indicator of working capacity is surface contact strength [1]
Angle), the aim of this work is to the accuracy of predicting the loadiscapacity thermally and chemically-thermally hardened gears by the criterion, respectively, reducing the difference in the characteristics of the stress state
Summary
For high-quality gearboxes with traditional involute gearing that are manufactured and operated in normal operating conditions, the primary indicator of working capacity is surface contact strength [1]. The material of the surface layer (without additional hardening) has a lower strength relative to the base. Such parts are characterized by surface contact damage or pitting; that is, progressive chipping from small pits to wide shallows with plastic deformation of surfaces
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