Contact Fatigue Resistance of Carburized Gears from Chromium-Nickel Steels

Rudenko, Sergei; Valko, A. L.

doi:10.1007/s11041-017-0103-3

Cited by 10 publications

(7 citation statements)

References 1 publication

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“…The effect of the residual stress distribution on the RCF lives was also investigated. Rudenko and Val'ko [21] studied the contact fatigue resistance of carburized gears experimentally, and an expression for the ultimate deep contact fatigue resistance of carburized gears was derived. Lv et al [22] studied the effect of the microshot peened treatment on the fatigue behavior of gears as well as the effects of the relaxation mechanism of the compressive residual stress on the gear fatigue performance.…”

Section: Introductionmentioning

confidence: 99%

Study on contact fatigue of a wind turbine gear pair considering surface roughness

Liu

Zhu

et al. 2019

Friction

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Contact fatigue issues become more and more crucial in gear industry as they significantly affect the reliability and service life of associated mechanical systems such as wind turbine gearboxes. The contact fatigue behavior is mostly determined by the mechanical properties of materials and stress fields near the contact area, which is further influenced by the lubrication and surface roughness due to pressure fluctuations. In this study, a numerical model incorporating the lubrication state, tooth surface roughness, residual stress, and mechanical properties of the material is developed to determine the contact fatigue behavior of a megawatt level wind turbine carburized gear. The variations of the hardness and residual stress along the depth were characterized by the Vickers hardness measurement and X-ray diffraction test, respectively. The elastohydrodynamic lubrication theory was applied to predict the contact pressure distribution, highlighting the influence of the surface roughness that stemed from the original measurement through an optical profiler. The stress histories of the studied material points during a complete contact loading cycle were fast calculated using the discreteconcrete fast Fourier transformation (DC-FFT) method. Modified Dang Van diagrams under different working conditions were determined to estimate the contact fatigue failure risk. The effect of the root mean square (RMS) value of the surface roughness on the failure risk at critical material points were discussed in detail. Results revealed that the surface roughness significantly increases the contact fatigue failure risk within a shallow area, and the maximum risk appears near the surface.

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Section: Introductionmentioning

confidence: 99%

Study on contact fatigue of a wind turbine gear pair considering surface roughness

Liu

Zhu

et al. 2019

Friction

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“…The use of the Guest-Mohr criterion with a constant coefficient of influence of normal stresses is correct mainly for sufficiently homogeneous structures [20,22]. Of course, this was a step in the right direction, with a structural coefficient variable in the hardness range (500-800), taking into account the influence of the bainitic and carbide phases [23,24]. However, the most promising, in our opinion, is the Lebedev-Pisarenko criterion for structurally heterogeneous material [33,34], used in [27][28][29], related, in particular, to the prediction of the occurrence of deep contact fractures (DCS) of Novikov's surface hardened gears, for which well-known recommendations for involute transfers were not acceptable.…”

Section: Methodsmentioning

confidence: 99%

“…When cementing steels for general engineering purposes, the best agreement with experimental data was obtained at H e = 550 HV; when cementing heat-resistant steels, and during nitrocarburizing, it is advisable to take H e = 610 HV. An example of using dependencies ( 7) and ( 8) according to experimental data [23,24] is shown in Figure 3.…”

Section: Hardness Distribution Over the Thickness Of The Hardened Layermentioning

confidence: 99%

“…; when cementing heat-resistant steels, and during nitrocarburizing, it is advisable to take 610 HV  e H . An example of using dependencies ( 7) and ( 8) according to experimental data [23,24] is shown in Figure 3. Novikov's nitro-cemented gears were bench tested at the IzMSK Ltd. company (Izhevsk, Russia) [27].…”

Section: E T H H H H H H B H H H H H Hmentioning

confidence: 99%

“…When calculating the strength of the working surfaces of the teeth, the coefficient q is most often taken as 6 q  . However, when evaluating the DCS of gears, recommendations for the designation of the exponent q vary significantly from 5 [23,24] to 18 [22]. In experiments with cemented rollers [2], the exponent ranged from q = 8 to 30 (but results predominantly prevailed at q > 17).…”

Section: Gear Life Ratiomentioning

confidence: 99%

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Deep Contact Strength of Surface Hardened Gears

Beskopylny

Meskhi

Onishkov

et al. 2020

Metals

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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%.

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