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bending-fatigue life

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Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2000
DOI: 10.31399/asm.tb.htgpge.t67320133
EISBN: 978-1-62708-347-8
... the effects of white layer formation in nitrided gears and presents general recommendations for nitrided gears. The chapter describes the microstructure, overload and fatigue damage, bending-fatigue life, cost, and distortion of nitrided gears. Information on nitriding steels used in Europe...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610147
EISBN: 978-1-62708-303-4
... to striations. Source: Ref 19 Fig. 26 Strain-life curves for steels with varying microstructures and hardness. Source: Ref 13 Fig. 32 Rotating-bending fatigue fracture of a keyed shaft of 1040 steel, approximately 30 HRC. The fatigue crack originated at the lower left corner...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2005
DOI: 10.31399/asm.tb.gmpm.t51250293
EISBN: 978-1-62708-345-4
... be considered in conjunction with the teeth to enhance fatigue life. bending stress fatigue life gears gear tooth impact fracture life prediction surface durability pitting wear GEARS can fail in many different ways, and except for an increase in noise level and vibration, there is often...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2005
DOI: 10.31399/asm.tb.gmpm.t51250227
EISBN: 978-1-62708-345-4
..., was developed by Palmgren and Miner. This theory is popularly known as Miner’s Rule and is now widely used to calculate both bending and pitting fatigue life of gears ( Ref 3 ). According to this theory, failure occurs when the following is satisfied: (Eq 2) ∑ i D i = ∑ i n i...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2000
DOI: 10.31399/asm.tb.htgpge.t67320033
EISBN: 978-1-62708-347-8
... is selected. The choice determines the surface case and core hardnesses. A low surface hardness of tooth reduces the pitting life of gears. On the other hand, low core hardness reduces bending fatigue life. As already discussed, the surface hardness of a gear tooth is strictly dependent on the percentage...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2005
DOI: 10.31399/asm.tb.gmpm.t51250163
EISBN: 978-1-62708-345-4
... and hardening is selected. The choice determines the surface case and core hardnesses. A low tooth surface hardness reduces the pitting life of gears. On the other hand, low core hardness reduces bending fatigue life. As already discussed, the surface hardness of a gear tooth is strictly dependent...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2000
DOI: 10.31399/asm.tb.htgpge.t67320017
EISBN: 978-1-62708-347-8
...) is considered an optimum for case-carburized and hardened gears. Carbon in the range of 0.10 to 0.20% considerably reduces the maximum hardness that can be attained in steels. This range is generally beneficial in the core of carburized and hardened gears for high bending fatigue life. Fig. 3.1 Relation...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2015
DOI: 10.31399/asm.tb.piht2.t55050155
EISBN: 978-1-62708-311-9
...-hardened effective case depth of 2.54 mm (0.100 in.) to 40 HRC. Source: Ref 6 Fig. 7.9 Bending fatigue life of actual SE 15B35 induction-hardened spindles vs. the induction power setting. Source: Ref 6 Abstract Abstract Induction hardened steels are often tempered to increase...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.fdsm.t69870157
EISBN: 978-1-62708-344-7
.... The difference, as explained, is due to the volumetric effect of stress in fatigue. bending fatigue elastic stress fatigue life low-cycle fatigue plastic flow shafts Introduction Application of the methodology thus far covered to the study of fatigue of circular shafts is valuable for two...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2005
DOI: 10.31399/asm.tb.gmpm.t51250311
EISBN: 978-1-62708-345-4
... in a set pattern to accomplish break-in. As described previously, break-in is expected to increase the life of the gears. Thus, all specimens tested in a given project should be broken in using the same method. For root strength (bending fatigue) tests, break-in may not affect bending fatigue life but may...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2005
DOI: 10.31399/asm.tb.gmpm.t51250001
EISBN: 978-1-62708-345-4
... area, good surface hardness and high residual compressive stress are desired to improve endurance, or bending fatigue life. At the pitch diameter, a combination of high hardness and adequate subsurface strength are necessary to handle contact stress and wear and to prevent spalling. Numerous...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1999
DOI: 10.31399/asm.tb.cmp.t66770135
EISBN: 978-1-62708-337-9
... of Residual Stress on the Fatigue Limit , Int. Conf. on Fatigue of Metals , Institution of Mechanical Engineers/American Society of Mechanical Engineers , 1956 , p 272 – 281 19. Arkhipov I. Y. and Polotskii M.S. (quoting Semencha), Tooth Bending Life of Case-Hardened Gears with Cores...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130241
EISBN: 978-1-62708-284-6
... 1303.2 Relative elongation (A 5 ), % 30.45 … … Necking (Z), % 70.06 … … Bending yield strength (R g 0.2), MPa 822.8 … … Bending strength (R g ), MPa … 2604.1 2889.8 Bending fatigue limit (σ −1 ), MPa 358.0 745.0 887.1 Surface-strengthening coefficient, m 1 2.08 2.48...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.fdsm.9781627083447
EISBN: 978-1-62708-344-7
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240243
EISBN: 978-1-62708-251-8
... are important, and an increase in mean stress will always cause a reduction in the fatigue life ( Fig. 14.8 ). A number of mathematical models have been developed that allow the effects of mean stress on stress amplitude to be predicted from fully reversed-bending data. Goodman developed a linear model, while...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540121
EISBN: 978-1-62708-309-6
... frequently is the major component of fatigue life, and so identification of the location and nature of origin sites is important in failure analysis. Typically fatigue cracks initiate near the surface, where nominal stresses are often higher (e.g., in bending), and where geometric variations at surfaces...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2005
DOI: 10.31399/asm.tb.gmpm.t51250039
EISBN: 978-1-62708-345-4
... characteristics of gear steels and the bending fatigue strength and properties of carburized steels are reviewed. In addition to wrought steels, the chapter provides information on the other iron-base alloys that are used for gears, namely cast carbon and alloy steels, gray and ductile cast irons, powder...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1995
DOI: 10.31399/asm.tb.sch6.t68200083
EISBN: 978-1-62708-354-6
... not have a crack-like sharpness and which do not significantly reduce the load-bearing area of a component, generally have little effect on bending fatigue performance. As noted above, notches or stress concentration sites will reduce the fatigue life and fatigue limit strength. One might suspect...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 November 2013
DOI: 10.31399/asm.tb.uhcf3.t53630117
EISBN: 978-1-62708-270-9
... Fig. 8 Electron micrograph showing a block-loaded test article with a band of 10 cycles of a higher load. Source: Ref 2 Fig. 17 Surface of a fatigue fracture in a grade 1050 steel shaft, with hardness of about 35 HRC, that was subjected to rotating bending. The presence of numerous...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1999
DOI: 10.31399/asm.tb.cmp.t66770171
EISBN: 978-1-62708-337-9
... 47.5 Source: Ref 22 Fatigue of 9310 steel at two retained austenite levels Table 7.18 Fatigue of 9310 steel at two retained austenite levels Life cycles Stress for failure Retained austenite, 56% Retained austenite, 31% 10 7 880 806 10 6 ~880 ~880 10 5 ~900...