Sub case origin fatigue in teeth of helical gear of a TA 67n turbo reducer

Ruchert, Cassius Olívio Figueiredo Terra; Maciel, Carla Isabel Santos; Chemin, Aline Emanuelle Albuquerque

doi:10.1016/j.engfailanal.2019.104286

Cited by 6 publications

(3 citation statements)

References 8 publications

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“…This phenomenon can be explained by the following reasons. The high temperature generated during grinding promoted the reaching of the austenitic field followed by rapid cooling, and the cooling fluid contributed to the transformation from the austenite to martensite phase [ 21 ]. White layer formation was fundamentally dependent on the thermal and mechanical effects of grinding on the workpiece material.…”

Section: Resultsmentioning

confidence: 99%

Grinding Temperature and Surface Integrity of Quenched Automotive Transmission Gear during the Form Grinding Process

Jiang

Liu²,

Yan

et al. 2022

Materials

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Grinding burn is an undesired defect in gear machining, and a white layer is an indication of severe burn that is detrimental to gear surface performance. In this work, the influence of grinding parameters on the thickness of the white layer during form grinding of quenched transmission gear was investigated, and the microstructure evolution and mechanism of severe burn formation were analyzed. The grinding temperature increased with the grinding depth and grinding speed, with the highest level of ~290 °C. The thickness of the white layer exceeded 100 μm when the grinding depth was 0.03 mm, and the top layer was a plastic deformation layer followed by a fine-grained martensite layer. Coarse-grained acicular martensite was found at the interface between the white layer and softened dark layer. The mechanical effect and thermal softening mainly contributed to the formation of white layer stratification. The ground surface topography showed several scratches and typical grooves; when grinding depth increased to 0.03 mm, the grinding surface roughness Sa was relatively high and reached up to ~0.60 μm, mainly owing to severe plastic deformation under grinding wheel extrusion and the thermal effect.

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Section: Resultsmentioning

confidence: 99%

Grinding Temperature and Surface Integrity of Quenched Automotive Transmission Gear during the Form Grinding Process

Jiang

Liu²,

Yan

et al. 2022

Materials

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“…Murakami et al 22–24 considered the effects of nonmetallic inclusions in gear steels and established a relationship between surface hardness and fatigue limits by introducing a parameter that represents the square root of the inclusion projecting to the plane of maximum tensile stress. The failure mechanism of the broken teeth of the intermediate gears shaft was measured by chemistry analysis, optical microscopy, scanning electron microscopy and so forth, and the results indicated that the oxide inclusion resulted in the gear fracture 25 . Some methods were presented to improve the fatigue life of gearboxes with the consideration of the nonmetallic inclusions 26 .…”

Section: Introductionmentioning

confidence: 99%

“…The failure mechanism of the broken teeth of the intermediate gears shaft was measured by chemistry analysis, optical microscopy, scanning electron microscopy and so forth, and the results indicated that the oxide inclusion resulted in the gear fracture. 25 Some methods were presented to improve the fatigue life of gearboxes with the consideration of the nonmetallic inclusions. 26 Otherwise, the microstructure alteration of gear materials due to the nonmetallic inclusion was investigated under fatigue load; it is shown that the fatigue cracks are easily originated from this microstructure alteration zone.…”

Section: Introductionmentioning

confidence: 99%

Fatigue life analysis of wind turbine gear with oxide inclusion

Liu

Sun

Hou

et al. 2020

Fatigue Fract Eng Mat Struct

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Considering a great deal of wind turbine gear failure cases, it is shown that the oxide inclusion has been one of the main reasons for the failure of the gear shaft under fatigue loading condition. In this paper, the fatigue behaviour of gears involving oxide inclusion under real operating condition is investigated. A three-dimensional finite element model for helical gear pair applied in the middle stage of wind power increasing gearbox is established, and the fatigue life of nonmetallic inclusion zone of middle gear shaft is predicted using Miner's theory and real load spectrum of wind power growth gearbox. Then, the effects of several factors (such as the size and position of oxide inclusion and residual stress induced by manufacturing) on the fatigue life of gears with inclusion are studied. The results show that both inclusion size and position have great influence on the fatigue life of gears, and the compress residual stress will prolong the fatigue life of gears. Furthermore, the critical safety line and safety region of gears with oxide inclusion have been obtained for three representative inclusion positions. The present work is expected to provide a guidance for the engineering design and life safety evaluation of wind turbine gears.

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Theoretical and analytical research on load sharing in helical gear with evaluating the FEA method and computerized approach of AGMA standards

Deepak¹,

Tamilselvam²

2023

J Comb Optim

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Sub case origin fatigue in teeth of helical gear of a TA 67n turbo reducer

Cited by 6 publications

References 8 publications

Grinding Temperature and Surface Integrity of Quenched Automotive Transmission Gear during the Form Grinding Process

Grinding Temperature and Surface Integrity of Quenched Automotive Transmission Gear during the Form Grinding Process

Fatigue life analysis of wind turbine gear with oxide inclusion

Theoretical and analytical research on load sharing in helical gear with evaluating the FEA method and computerized approach of AGMA standards

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