Comparison of Single Gear Tooth and Cantilever Beam Bending Fatigue Testing of Carburized Steel

Medlin, Dana J.; Krauß, G.; Matlock, David K.; Burris, Kenneth W.; Slane, M.

doi:10.4271/950212

Cited by 11 publications

(5 citation statements)

References 23 publications

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“…The bending fatigue and fracture properties of carburized steels have been evaluated with laboratory cantilever bend specimens (1)(2)(3)(4)(5), single-tooth bending fatigue tests (4,(6)(7)(8), full-scale gear tests in operating systems and other alternate testing geometries (9). To obtain systematic analyses of alloying and processing variables, laboratory bend samples have been used and several geometries have been considered (1,10).…”

Section: Introductionmentioning

confidence: 99%

“…While development of fatigue data on laboratory cantilever beam bend samples provides a cost-effective method to assess systematic variations in process variables, microstructural and geometry characteristics important for fatigue performance may differ from carburized production gears. For example, due to the small size and corresponding higher cooling rates experienced on quenching, core hardness levels in laboratory samples are typically higher than observed in gears (4). The corresponding differences in hardness and microstructural gradients may correlate to differences in residual stress and retained austenite profiles, both important to fatigue performance.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, the purpose of this paper is to present the results of one such comparison study. Fatigue data on commercial pinion gears, produced from forged SAE 8620 blanks and tested on a dynamometer, are compared to results on laboratory samples, which utilized the modified Brugger sample considered in previous studies (1)(2)(3)(4)(5). Four sample sets, each which included both production gears and laboratory samples, were chosen to reflect the significant variations in the fatigue behavior observed in laboratory samples (2,3).…”

Section: Introductionmentioning

confidence: 99%

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Optimized Carburized Steel Fatigue Performance as Assessed with Gear and Modified Brugger Fatigue Tests

Spice¹,

Matlock²,

Fett³

2002

SAE Technical Paper Series

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The effectiveness of three different techniques, designed to improve the bending fatigue life in comparison to conventionally processed gas-carburized 8620 steel, were evaluated with modified Brugger bending fatigue specimens and actual ring and pinion gears. The bending fatigue samples were machined from forged gear blanks from the same lot of material used for the pinion gear tests, and all processing of laboratory samples and gears was done together. Fatigue data were obtained on standard as-carburized parts and after three special processing histories: shotpeening to increase surface residual stresses; double heat treating to refined austenite grain size; and vacuum carburizing to minimize intergranular oxidation. Standard room-temperature S-N curves and endurance limits were obtained with the laboratory samples. The pinions were run as part of a complete gear set on a laboratory dynamometer and data were obtained at two imposed torque levels. The number of cycles to failure was used to evaluate the effects of processing history. Based on laboratory endurance limits, shown in parentheses, the processing histories ranked as follows: shot-peened (1410 MPa), vacuum carburized (1210 MPa), reheated to refine grain size (1140 MPa), and asgas-carburized (1000MPa). In the gear set tests, shot peening also proved to be the most effective way to improve fatigue life at both imposed torque levels. The results of this study show that data on laboratory samples can be used to interpret the fatigue performance of gears.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Optimized Carburized Steel Fatigue Performance as Assessed with Gear and Modified Brugger Fatigue Tests

Spice¹,

Matlock²,

Fett³

2002

SAE Technical Paper Series

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“…Moreover, specimens' testing may be faster, easier and less expensive than using gears. Several authors systematically tested specimens made of case-hardened gear steels using plain bending, [3][4][5][6][7][8][9][10][11] rotating bending, [12][13][14][15][16][17] or axial test configurations. 18,19 However, the aim of such experimental campaigns was mainly to evaluate comparatively different materials and/or manufacturing processes and to investigate the damage mechanisms, rather than obtaining fatigue curves to assess the bending fatigue strength.…”

Section: Introductionmentioning

confidence: 99%

Bending fatigue design of case-hardened gears based on test specimens

Meneghetti

Dengo²,

Conte³

2017

Proceedings of the Institution of Mechanical Engineers, Part C:

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Different design methods against bending fatigue are reported in ISO 6336 standard. The standard suggests primarily the method based on reference test gears and provides the relevant fatigue curves. Additionally, the standard suggests the use of specimens (instead of gears) to generate the reference fatigue curves, but it also advices that specimen-based methods can be used when gears are not available and that specimens are particularly useful for comparing fatigue performances of gear materials relative to one another. The purpose of the present paper is to evaluate the accuracy of the specimen-based methods mentioned in the ISO standard when applied to design gears against bending fatigue. Experimental data were generated by means of pulsator fatigue tests on case-hardened gears used in off-highway vehicles. Afterwards, experimental results were compared with theoretical estimations according to the approaches based on reference test gears (as suggested by the ISO standard) and test specimens. Concerning the latter approach, the relevant fatigue design curves were generated by testing smooth as well as notched specimens made of the same case-hardened gear steel. It was found that the specimens-based methods are as accurate as the reference gears-based method, provided that the material notch sensitivity factor is properly calibrated on the experimental results obtained from specimens.

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“…Através das análises das superfícies de fratura, foi constatado que houve iniciação e propagação transgranular de trincas por fadiga através da camada cementada para os corpos de prova dos quatro tratamentos, No interior de alguns microvazios foi constatada a presença de partículas, MEDLIN et al (1995) identificou partículas semelhantes como sendo inclusões não metálicas de sulfeto de manganês, MnS.…”

Section: Análise Da Superfície De Fraturaunclassified

Influência da austenita retida no crescimento de trincas curtas superficiais por fadiga em camada cementada de aço SAE 8620

Silva¹

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Comparison of Single Gear Tooth and Cantilever Beam Bending Fatigue Testing of Carburized Steel

Cited by 11 publications

References 23 publications

Optimized Carburized Steel Fatigue Performance as Assessed with Gear and Modified Brugger Fatigue Tests

Optimized Carburized Steel Fatigue Performance as Assessed with Gear and Modified Brugger Fatigue Tests

Bending fatigue design of case-hardened gears based on test specimens

Influência da austenita retida no crescimento de trincas curtas superficiais por fadiga em camada cementada de aço SAE 8620

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