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Open AccessArticle

Deep Contact Strength of Surface Hardened Gears

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Department of Transport Systems, Faculty of Roads and Transport Systems, Don State Technical University, Gagarin, 1, 344000 Rostov-on-Don, Russia
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Department of Life Safety and Environmental Protection, Faculty of Life Safety and Environmental Engineering, Don State Technical University, Gagarin, 1, 344000 Rostov-on-Don, Russia
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Department of Transport Systems and Logistics, Faculty of Transport, Servis and Maintenance, Don State Technical University, Gagarin, 1, 344000 Rostov-on-Don, Russia
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Department of Mathematics, Faculty of IT-Systems and Technologies, Don State Technical University, Gagarin, 1, 344000 Rostov-on-Don, Russia
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Department of Marketing and Engineering Economics, Faculty of Innovative Business and Management, Don State Technical University, Gagarin, 1, 344000 Rostov-on-Don, Russia
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Author to whom correspondence should be addressed.
Metals 2020, 10(5), 600; https://doi.org/10.3390/met10050600
Received: 2 April 2020 / Revised: 29 April 2020 / Accepted: 4 May 2020 / Published: 5 May 2020
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%. View Full-Text
Keywords: gears; fracture; durability; strength criteria; deep contact strength; chemical-thermal treatment; hardened layer; hardness; plasticity parameter gears; fracture; durability; strength criteria; deep contact strength; chemical-thermal treatment; hardened layer; hardness; plasticity parameter
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MDPI and ACS Style

Beskopylny, A.; Meskhi, B.; Onishkov, N.; Kotelnitskaya, L.; Ananova, O. Deep Contact Strength of Surface Hardened Gears. Metals 2020, 10, 600.

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