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Bending fatigue

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.rail.c9001496
EISBN: 978-1-62708-231-0
... bending fatigue of the gear from the reverse direction near the toe end. The cause of failure was a crossed-over tooth bearing condition that placed loads at the heel end when going forward and at the toe end when going in reverse. The condition was too consistent to be a deflection under load; therefore...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c0047113
EISBN: 978-1-62708-219-8
... should be tightened according to the specifications of the manufacturer, and the system should be periodically inspected for correct tightness. Bending fatigue Forgings Structural bolts Structural steel Fatigue fracture A portion of a large (19-mm, or 0.75-in., diam) structural steel bolt...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.machtools.c0047779
EISBN: 978-1-62708-223-5
... specified for the shafts was a free-machining grade of A6 tool steel. Fig. 1 A6 tool steel tube-bending-machine shaft that failed by fatigue fracture. Section A-A: Original and improved designs for fillet in failure region. Dimensions are in inches. View B: Fracture surface showing regions of fatigue...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c0047817
EISBN: 978-1-62708-233-4
... in the shaft portion at the intersection of a 1.3 cm thick wall and a tapered surface at the bottom of the hole. The fatigue crack was influenced by one-way bending stresses initiated at the inner surface and progressed around the entire inner circumference. A heavily decarburized layer was detected...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c9001497
EISBN: 978-1-62708-221-1
.... The 4817 NiMo alloy steel pinion showed no indication of additional cracking, nor did the 4820 NiMo alloy steel gear. The mode of failure was tooth bending fatigue with the origin at the designed position: root radius at midsection of tooth. The load was well centered, and progression occurred for a long...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c0048020
EISBN: 978-1-62708-224-2
... by measurement checks. The presence of broken wire ends, which indicated that the rope failed by fatigue, was revealed by reverse bending of the section of the rope which was normally subjected to this flexing. It was found that minimum sheave diam for a 13-mm 18 x 7 wire rope was 43 cm and hence the currently...
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 June 2019
Fig. 8 Laboratory reversed-bending fatigue failure displays fatigue and overload fracture surfaces. Magnification 120 times. More
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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: 01 June 2019
Fig. 1 Fracture “A” in a spiral gear. The origin (O) of tooth bending fatigue is near the toe end of the concave (reverse) root radius. See also Fig. 2 and 3 . More
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Published: 01 June 2019
Fig. 3 Of the 15 teeth that failed by tooth bending fatigue, two fractures intersected a bolt hole (see Fig. 1 and 2 ). Four other fractures touched the apex (A) of a bolt hole. Nine teeth failed by tooth bending fatigue completely away from a bolt hole. All 15 have an origin (O More
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Published: 01 June 2019
Fig. 1 Pushrod that fractured in bending fatigue after being fabricated by inertia welding. (a) Configuration and dimensions (given in inches). (b) and (c) Micrographs showing structure of decarburized inner surface and sound metal below the decarburized layer More
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Published: 01 June 2019
Fig. 1 1040 steel fan shaft that fractured in reversed-bending fatigue. (a) Overall view of shaft. Dimensions given in inches. (b) Fracture surface showing diametrically opposed origins (arrows) More
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Published: 01 June 2019
Fig. 1 Spiral bevel pinion tooth, 2×. Tooth bending fatigue with origin (arrow) at the root radius, exactly midway between the ends of the teeth. More
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Published: 01 June 2019
Fig. 7 Laboratory reversed-bending fatigue failure showing a flat, fibrous, transverse fatigue fracture surface containing many secondary cracks, a transverse ductile fracture surface characterized by microvoid coalescence, and a longitudinal overload fracture surface hainvg a shear lip More
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Published: 01 June 2019
Fig. 1 Typical fracture face of crankshaft which failed by bending fatigue. Note origin at fillet and distinct “beach marks”. (AISI 4340 steel, heat treated and nitrided all over) More
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Published: 01 January 2002
Fig. 22 Bolt fracture surface produced by unidirectional bending fatigue. The origin site can be located by tracing the centers of curvature of beach marks back to the thread root at the arrow. Source: Ref 4 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: 30 August 2021
Fig. 19 Stainless steel boat shaft that failed by bending fatigue. Cracks initiated at surface gouges at the 1 and 5 o’clock locations. More