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single-tooth fatigue test

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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
..., namely dimensional, surface finish texture, metallurgical, and residual stress. The following section presents the tests that simulate gear action, namely the rolling contact fatigue test, the single-tooth fatigue test, the single-tooth single-overload test, and the single-tooth impact test. Finally...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130417
EISBN: 978-1-62708-284-6
... that one shaft had not failed after testing for the maximum number of cycles shown. Source: Ref 45 Fig. 95 Bending fatigue strength of gear teeth at (a) tooth gap hardening and (b) flank hardening for various steels. Broken lines denote confidence limit according to DIN 3990. Source: Ref 36...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2005
DOI: 10.31399/asm.tb.gmpm.t51250139
EISBN: 978-1-62708-345-4
... fatigue or by surface fatigue mechanisms such as pitting or spalling. The origin of pitting occurs where the combination of pressure and negative sliding are the highest. On spur gears, this is usually at the lowest point of single-tooth contact on the dedendum of the drive gear ( Ref 8 ). As with any...
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
... by a thinner section of the tooth and results in greater growth, which generates excessive tensile stress in the case. This lowers the residual compressive stress in the case and thereby reduces the fatigue life. This is why small DP nitrided gears show higher bending fatigue life than large DP nitrided gears...
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
... (975 °F), 28% dissociation, 50 h at 525 °C (975 °F), 84% dissociation 0.559 0.022 0.0178 0.0007 89.3–91 27–33 Any presence of white layer (above 0.025 mm, or 0.001 in.) on the tooth surface is considered very detrimental to the fatigue life of nitrided gears. To improve fatigue life...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2005
DOI: 10.31399/asm.tb.gmpm.t51250257
EISBN: 978-1-62708-345-4
... in helical gear teeth. In some areas, the progression has been continuous. Shown at actual size Fig. 17 Near-pitchline pitting fatigue in a spiral pinion tooth. Origin is subsurface at plane of maximum shear. Original magnification at 180× Third, the lowest point of single-tooth contact...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1999
DOI: 10.31399/asm.tb.cmp.t66770135
EISBN: 978-1-62708-337-9
... for case depth (and quality) assessment, the case depth measurements must be at the locations specified by the designer. If no locations are specified, the primary test location must be at a critical area (for gear teeth this is near the lowest point of single tooth contact). If test pieces are employed...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2005
DOI: 10.31399/asm.tb.gmpm.t51250293
EISBN: 978-1-62708-345-4
...Abstract Abstract This chapter summarizes the various kinds of gear wear and failure and how gear life in service is estimated and discusses the kinds of flaws in material that may lead to premature gear fatigue failure. The topics covered are alignment, gear tooth, surface durability...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2015
DOI: 10.31399/asm.tb.piht2.t55050191
EISBN: 978-1-62708-311-9
... pinion, a shaft with helical gear, and a pump gear. Research performed by the Gear Research Institute has shown that contour-hardened gears performed better than carburized gears in single-tooth and power-circulating bending strength tests. Carburized gears are better in rolling contact. Note...
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 September 2005
DOI: 10.31399/asm.tb.gmpm.t51250019
EISBN: 978-1-62708-345-4
... Failure This chapter is concerned with gear tooth failures that are influenced by friction, lubrication, and wear. Pitting or scuffing may cause the gear teeth to deteriorate and generate dynamic forces, which in turn cause the gear teeth to fail by bending fatigue. In these cases, the bending...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2000
DOI: 10.31399/asm.tb.htgpge.t67320175
EISBN: 978-1-62708-347-8
... is to be hardened, depth of case at the root may be separately specified. Fig. 9.2 Recommended maximum surface hardness and effective case depth hardness vs. carbon percent for induction-hardened gears Core Hardness of Tooth and Fatigue Strength For every gear material, there is an optimum core...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2000
DOI: 10.31399/asm.tb.htgpge.t67320033
EISBN: 978-1-62708-347-8
... small pits initiated by fatigue cracks are formed on or below the tooth surface. These pits usually emanate at the highest point of single-tooth contact (HPSTC) for pinion and at the lowest point of single-tooth contact (LPSTC) for the mating gear ( Fig. 5.10 ). The occurrence of pits is also found...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2005
DOI: 10.31399/asm.tb.gmpm.t51250249
EISBN: 978-1-62708-345-4
... is to be hardened, depth of case at the root may be separately specified. Fig. 3 Recommended maximum surface hardness and effective case depth hardness vs. carbon percent for induction-hardened gears Core Hardness of Tooth and Fatigue Strength For every gear material, there is an optimum core...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 November 2013
DOI: 10.31399/asm.tb.uhcf3.t53630169
EISBN: 978-1-62708-270-9
... by the abrasive wear of sand in the cooling system. The change in shape of the vanes reduces the efficiency of the pump; if abrasive wear were to continue long enough, the vanes—and efficiency—would be completely gone. Fig. 5 Diagram of self-sharpening rodent tooth. See text for description. Source...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610461
EISBN: 978-1-62708-303-4
... hardness near 60 HRC. (d) Cross section through a gear tooth showing subcase-origin fatigue cracks similar to those sketched in (a). The original fatigue cracks are those parallel to the surface below the dark etched case. When these cracks join, the cracks to the surface then complete removal of the large...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2005
DOI: 10.31399/asm.tb.gmpm.t51250089
EISBN: 978-1-62708-345-4
... The methods of gear cutting can be divided broadly into form cutting and generating processes. The tooth profile in the former is obtained by using a form cutting tool. This may be a multiple-point cutter used in a milling machine or a broaching machine, or a single-point tool for use in a shaper. A variation...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2005
DOI: 10.31399/asm.tb.gmpm.t51250039
EISBN: 978-1-62708-345-4
... important approach to the fatigue evaluation of carburized steels. An example of component testing is the bending fatigue testing of single teeth in gears ( Ref 11 ). Gears are fabricated, carburized, and mounted in a fixture so that one tooth at a time is subjected to cyclic loading. More recently...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.horfi.9781627082563
EISBN: 978-1-62708-256-3
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1999
DOI: 10.31399/asm.tb.cmp.t66770199
EISBN: 978-1-62708-337-9
... the foregoing but illustrated how more severe grinding can significantly impair fatigue strength ( Fig. 8.15 ). In commercial gear-tooth fillet grinding where the emphasis is on output, the grinding conditions can be less than gentle; hence, there is a tendency to produce inferior quality components...