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Rotating-bending fatigue

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c0091092
EISBN: 978-1-62708-224-2
.... Investigation (visual inspection, inspection records review, optical and scanning electron microscopy, and fractography) supported the conclusion that the fracture mode for both shafts was low-cycle rotating-bending fatigue initiating and propagating by combined torsional and reverse bending stresses...
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Published: 01 January 2002
Fig. 23 Carbon steel shaft broken in rotating bending fatigue. Fatigue fracture initiated at numerous sites along a sharp snap ring groove; ratchet marks appear as shiny spots along the surface. Cracks coalesced into a single fatigue crack that—due to the bending stress distribution—grew most More
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Published: 15 January 2021
Fig. 23 Carbon steel shaft broken in rotating-bending fatigue. Fatigue fracture initiated at numerous sites along a sharp snap ring groove; ratchet marks appear as shiny spots along the surface. Cracks coalesced into a single fatigue crack that—due to the bending-stress distribution—grew most More
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Published: 01 January 2002
Fig. 24 Rotating bending fatigue failure of keyed medium-carbon steel shaft. Fatigue initiated at a corner of the keyway, as marked. Beach marks in that vicinity are concentric about the origin. As the fatigue crack grew, the bending stress distribution produced more rapid growth near More
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Published: 30 August 2021
Fig. 5 Typical rotating-bending fatigue marks on the fracture surface of a uniformly loaded rotating shaft. Marks are produced from single and multiple origins (arrows) having moderate and severe stress concentration; shaded areas are final-fracture zones. Shaft rotation is clockwise. More
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Published: 15 January 2021
Fig. 24 Rotating-bending fatigue failure of keyed medium-carbon steel shaft. Fatigue initiated at a corner of the keyway, as marked. Beach marks in that vicinity are concentric about the origin. As the fatigue crack grew, the bending-stress distribution produced more rapid growth near More
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001846
EISBN: 978-1-62708-241-9
...-cycle rotation-bending fatigue. The bearing sleeve failed as a result of abrasive and adhesive wear. Detailed metallurgical analysis indicated that the sleeve and its respective journal had been subjected to abnormally high temperatures, increasing the amount of friction between the sleeve, bearing bush...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001350
EISBN: 978-1-62708-215-0
... examination showed ratchet marks at the edges of the fracture surface, indicating that loading was of the rotating bending type. Electron fractography using the two-stage replica method revealed striation marks characteristic of fatigue fracture. The striations indicated that the cracks had advanced on many...
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Published: 15 January 2021
Fig. 26 Fatigue cracks in laboratory test specimens. (a) Steering knuckle made of ferritic ductile iron showing macroscopic features of a fatigue crack initiated at a sharp corner. (b) Rotating-bending fatigue specimen made of as-cast gray iron. Fatigue in this relatively brittle gray iron More
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Published: 01 January 2002
Fig. 26 Fatigue cracks in laboratory test specimens of (a) a steering knuckle made of ferritic ductile iron showing macroscopic features of a fatigue crack initiated at a sharp corner, and (b) a rotating bending fatigue specimen made of as-cast gray iron. Fatigue in this relatively brittle More
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Published: 15 January 2021
Fig. 21 Curved beach marks are centered on the surface origin (arrow) of this shaft that failed in rotating-bending fatigue. Beach marks are nearly semicircular near the origin. As the crack became larger, it grew more rapidly near the surface where bending stress was highest, resulting More
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Published: 01 January 2002
Fig. 21 Curved beach marks are centered on the surface origin (arrow) of this shaft that failed in rotating bending fatigue. Beach marks are nearly semicircular near the origin. As the crack became larger, it grew more rapidly near the surface where bending stress was highest, resulting More
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Published: 15 January 2021
Fig. 2 Close-up view of ratchet marks between distinct surface origin sites in an 18.4 cm (7.25 in.) low-alloy steel shaft that failed in rotating-bending fatigue. Ratchet marks (at arrows) are roughly radial steps formed where fatigue cracks initially propagating on different planes More
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Published: 01 January 2002
Fig. 2 Close-up view of ratchet marks between distinct surface origin sites in a low-alloy steel 18.4 cm (7.25 in.) shaft that failed in rotating bending fatigue. Ratchet marks (at arrows) are roughly radial steps formed where fatigue cracks initially propagating on different planes More
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Published: 15 January 2021
Fig. 19 Observation of failed nickel-base alloy (Waspaloy) specimen after rotating-bend fatigue. (a) Macro view. (b) Micrograph. Source: Ref 53 More
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Published: 01 January 2002
Fig. 19 Observation of failed nickel-base alloy (Waspaloy) specimen after rotating bend fatigue. (a) Macro view. (b) Micrograph. Source: Ref 43 More
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Published: 30 August 2021
-bending fatigue fracture with ratchet marks and final overload section in the center More
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003539
EISBN: 978-1-62708-180-1
... loading of prismatic members and rotating bending of shafts, the driving force for fatigue initiation (e.g., stress range) is relatively uniform over extended volumes or regions. For relatively low driving force, fatigue initiates at one or a few locations within these extended regions or volumes where...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001794
EISBN: 978-1-62708-241-9
... Abstract The drive shaft in a marine propulsion system broke, stranding a large vessel along the Canadian seacoast. The shaft was made from quenched and tempered low-alloy steel. Fractographic investigation revealed that the shaft failed under low rotating-bending variable stress. Fatigue...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006776
EISBN: 978-1-62708-295-2
... that act as points of stress concentration, facilitating fatigue crack initiation. In many common situations, such as uniaxial loading of prismatic members and rotating bending of shafts, the driving force for fatigue initiation (e.g., stress range) is relatively uniform over extended volumes...