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ratchet marks

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Published: 01 December 1992
Fig. 4 Fracture surface on the spindle, showing beach marks and ratchet marks. More
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Published: 30 August 2021
Fig. 19 Ratchet marks, including marks that extend from the root and only part way through the weld throat, indicate that multiple failure points were involved, with cracking starting in the weld root. More
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Published: 01 January 2002
Fig. 41 Ratchet marks. (a) Schematic of two cracks that initiate in close proximity to each other. The two cracks then coalesce after some growth. (b) A ratchet mark on a cylindrical section of a 1042 steel loaded in rotating bending. Radial marks indicate the two initiation sites. Source 41(b 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: 01 June 2019
Fig. 6 SEM photograph of cylinder clamping rods showing ratchet marks: a) 30×, b) 30×, c) 150× More
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Published: 01 June 2019
Fig. 2 Crescent shaped envelope with coarse brittle fracture and `ratchet' marks at × 2 More
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Published: 01 June 2019
Fig. 12 Superheater Failure - Note flat oxidized surface with ratchet marks (arrows). More
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Published: 15 January 2021
Fig. 25 Examples of the formation of ratchet marks (RM) on fatigue fractures. (a) Screw shaft with rough surface finish. (b) Notch section of a fixing pin More
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Published: 15 January 2021
Fig. 42 Ratchet marks. (a) Schematic of two cracks that initiate in close proximity to each other. The two cracks then coalesce after some growth. (b) Ratchet mark on a cylindrical section of a 1042 steel loaded in rotating bending. Radial marks indicate the two initiation sites. Source (b More
Image
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 December 2019
Fig. 8 Ratchet marks emanating from concentric groove on interior surface of club face plate More
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Published: 01 December 2019
Fig. 5 Ratchet marks showing a number of secondary sources of cracks More
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Published: 01 December 1993
Fig. 8 Stereomicrograph showing initiation points and ratchet marks More
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Published: 30 August 2021
Fig. 36 The surface of this tooth shows distinctive ratchet marks that point in different directions, indicating that cracking started at the neutral point (arrow), and this is where a metallurgical examination should begin. More
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Published: 30 August 2021
Fig. 38 Fatigue crack showing multiple origins and ratchet marks that originated in dedendum macropitting. There is also a small very small fatigue zone on the other side. More
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001792
EISBN: 978-1-62708-241-9
... to the propeller, is made of low alloy steel. The other shaft, part of a clutch mechanism that regulates the transmission of power from the engine to the gears, is made of carbon steel. Fracture surface examination of the gear shaft revealed circumferential ratchet marks with the presence of inward progressive...
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...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001640
EISBN: 978-1-62708-235-8
... eye. New castings with reduced porosity also failed the durability tests. The fatigue fracture surfaces of additional casting fragments were very rough and contained multiple ratchet marks along the inner fillet. These observations indicated the fatigue process was heavily influenced by the presence...
Image
Published: 15 January 2021
Fig. 18 This broken 30 mm (1.2 in.) diameter steel shaft exhibits flat, relatively smooth fracture, without shear lips and with generally horizontal beach marks, at top and bottom areas. Along with ratchet marks (four distinct ratchet marks are evident along the top edge), these features More
Image
Published: 01 January 2002
Fig. 18 This broken 30 mm (1.2 in.) diameter steel shaft exhibits flat, relatively smooth fracture, without shear lips and with generally horizontal beach marks, at top and bottom areas. Along with ratchet marks (four distinct ratchet marks are evident along the top edge), these features More