Effects of Addendum Modification on Bending Fatigue Strength of Spur Gears : 3rd Report, Cast Iron and Cast Steel Gears

The paper gives the results of a systematic investigation into the effects of the proportions of a cast crankshaft on its bending fatigue strength. A single-throw shaft of 4½ inches diameter was chosen as likely to give information useful to the builders of small stationary engines as well as automobile engines, and the different dimensions were varied one at a time over a range which covered the usual practical proportions. In addition, to obtain some information on a possible scale effect, tests on a geometrically similar shaft of 2¼ inches diameter were included. It is considered that, with a few exceptions which are indicated in the paper, most of the conclusions from these tests will apply equally to forged and cast crankshafts. The paper refers also to tests made on a number of different cast-iron and cast-steel crankshafts of the same design, to determine, from the point of view of fatigue strength, their merits as crankshaft materials, and to find out to what extent the fatigue strength of the finished crankshaft can be predicted from the usual mechanical tests on the materials.

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On the Influence of the Surface Rolling at the Root Fillet to the Bending Fatigue Strength of Sintered Metal, Cast Iron and Ductile Cast Iron Gears

Journal of the Japan Society of Precision Engineering ◽

10.2493/jjspe1933.38.945 ◽

1972 ◽

Vol 38 (454) ◽

pp. 945-952

Author(s):

Toshio AIDA ◽

Norihisa ARAI ◽

Shigeo ADACHI ◽

Yoshio KUBO

Keyword(s):

Cast Iron ◽

Fatigue Strength ◽

Ductile Cast Iron ◽

Bending Fatigue ◽

Sintered Metal ◽

Bending Fatigue Strength

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Bending fatigue strength and impact strength of spur gears with various surface hardening treatments

The Proceedings of Conference of Chugoku-Shikoku Branch ◽

10.1299/jsmecs.2021.59.05a1 ◽

2021 ◽

Vol 2021.59 (0) ◽

pp. 05a1

Author(s):

Ryo ASAKURA ◽

Kohei HIBI ◽

Kenichi SAKAMOTO ◽

Toshiyasu OMURA ◽

Ryosuke NISHI ◽

...

Keyword(s):

Fatigue Strength ◽

Impact Strength ◽

Surface Hardening ◽

Spur Gears ◽

Bending Fatigue ◽

Bending Fatigue Strength

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Effects of case depth, face width and intergranular oxidation on bending fatigue strength of case-carburized SNC815 and SCM415 steel spur gears

International Gear Conference 2014: 26th–28th August 2014, Lyon ◽

10.1533/9781782421955.950 ◽

2014 ◽

pp. 950-958 ◽

Cited By ~ 1

Author(s):

K. Miyachika ◽

T. Ikuta ◽

N. Maeta ◽

H. Mada

Keyword(s):

Fatigue Strength ◽

Case Depth ◽

Spur Gears ◽

Bending Fatigue ◽

Face Width ◽

Intergranular Oxidation ◽

Bending Fatigue Strength

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The Evaluation of Bending Fatigue Testing of Austempered Ductile Iron Spur Gear

Volume 10: 2019 International Power Transmission and Gearing Conference ◽

10.1115/detc2019-97194 ◽

2019 ◽

Author(s):

Qi Zhang ◽

Jianhua Lv ◽

Rizwanulhaque Syed ◽

Jing Zhang ◽

Yang Xu ◽

...

Keyword(s):

Fatigue Strength ◽

Ductile Iron ◽

Fatigue Testing ◽

Spur Gear ◽

Austempered Ductile Iron ◽

Spur Gears ◽

Reliability Design ◽

Bending Fatigue ◽

Bending Fatigue Strength ◽

Number Of Cycles

Abstract An experimental evaluation of bending fatigue strength for austempered ductile iron (ADI) spur gears have been performed using Zwick fatigue tester. The gear material was manufactured by vertically continuous casting, in which the radius of the graphite grains is smaller. The Stress-Number of Cycles curve (S-N curve) for the bending fatigue strength of the ADI spur gears are manufactured without any specific surface treatments, and have been obtained by post-processing software. It was observed that when the reliability was 50%, the fatigue limit was 304.89 MPa. It has provided a reliable basis to rate the reliability design of the small gearboxes in automation later.

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Tooth Root Bending Fatigue Strength of High-Density Sintered Small-Module Spur Gears: The Effect of Porosity and Microstructure

Metals ◽

10.3390/met9050599 ◽

2019 ◽

Vol 9 (5) ◽

pp. 599 ◽

Cited By ~ 1

Author(s):

Vigilio Fontanari ◽

Alberto Molinari ◽

Michelangelo Marini ◽

Wolfgang Pahl ◽

Matteo Benedetti

Keyword(s):

Fatigue Strength ◽

Surface Defect ◽

Detrimental Effect ◽

Case Hardening ◽

Spur Gears ◽

Tooth Root ◽

Near Surface ◽

Bending Fatigue ◽

Microstructural Constituent ◽

Bending Fatigue Strength

The present paper is aimed at investigating the effect of porosity and microstructure on tooth root bending fatigue of small-module spur gears produced by powder metallurgy (P/M). Specifically, three steel variants differing in powder composition and alloying route were subjected either to case-hardening or sinter-hardening. The obtained results were interpreted in light of microstructural and fractographic inspections. On the basis of the Murakami a r e a method, it was found that fatigue strength is mainly dictated by the largest near-surface defect and by the hardness of the softest microstructural constituent. Owing to the very complicated shape of the critical pore, it was found that its maximum Feret diameter is the geometrical parameter that best captures the detrimental effect on fatigue.

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