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fatigue resistance

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c0047681
EISBN: 978-1-62708-229-7
... from the resistance welds was generally present. The stator vane failed by a fatigue crack that initiated at internal surface discontinuities caused by metal expulsion from the resistance seam weld used in fabricating the vane. Expulsion of metal from seam welds should be eliminated by a slight...
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
... was deficient in strength for the cyclic applied loads in this case and probably was not tightened sufficiently. Recommendations included removing the remaining bolts in the crane support assembly and replacing them with a higher-strength, more fatigue-resistant bolt, for example, SAE grade F, 104 to 108 HRB...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001742
EISBN: 978-1-62708-217-4
... various modifications, such as a thicker rod, fatigue resistant bolts, and more accurate preload measurements. The configuration of these rods were changed to a tongue-and-groove design to increase service life. Bolted joints Connecting rods Design Helicopters Specifications Torque Metal...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001910
EISBN: 978-1-62708-217-4
... components were not in the nitrided condition as was required. This resulted in lower wear and fatigue resistance. These components also had a silicon content nearly double of that specified. The high silicon content lowered the notch tensile strength and toughness of the components. Breech bolts...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0090994
EISBN: 978-1-62708-225-9
... wire tensile strength range was 1689 to 1793 MPa (245 to 260 ksi). The finished springs were to be shot peened for greater fatigue resistance. Investigation (visual inspection, 3x images, 2% nital etched 148x SEM images, chemical analysis, hardness testing, and EDS analysis) supported the conclusion...
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
... material and the heat treatment are the same as those expected in drive shafts, it is worth noticing that from the fatigue resistance (endurance limit) perspective, the material capabilities might have not been fully achieved. Indeed, it is generally accepted that in steels, endurance limit is directly...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001583
EISBN: 978-1-62708-217-4
.... Retaining rod fatigue testing results Table 1 Retaining rod fatigue testing results Component No. of cycles A-1 108,460 A-2 157,274 B-1 94,335 B-2 131,460 C-1 46,735 C-2 54,637 AMS 5629, “Steel, Corrosion Resistant Bars, Forgings, Rings, and Extrusions...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001809
EISBN: 978-1-62708-180-1
... region of a bearing or on the surface of high-speed gear teeth. Its appearance is shown in Fig. 9 . Cavitation may be reduced by using fatigue-resistant metals, by increasing the lubricant viscosity, and by increasing the pressure in the system. Entrained air or water in oil can increase...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.rail.c9001607
EISBN: 978-1-62708-231-0
... are detrimental to the fatigue resistance of the steel. 2 Fractographic examination revealed that the cracks were initiated by the nonmetallic inclusions near the surface. The fatigue cracks propagated under cyclic loading in a number of wires. Numerous wire strands contained beach marks and fatigue striations...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001717
EISBN: 978-1-62708-217-4
... temperatures during thermal treatment. These large grains offered less resistance to fatigue and SCC. In addition, evidence of titanium-carbo-nitrides was detected at the grain boundaries of this material that was prohibited according to the governing specification. This phase is formed at higher thermal...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c9001527
EISBN: 978-1-62708-224-2
... handedness, and many other attributes. Rope grades are rated in tons of breaking strength. The individual wires provide strength, whereas the construction dictates service characteristics. It is generally accepted that many smaller wires provide better fatigue resistance, while fewer, larger wires provide...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001780
EISBN: 978-1-62708-241-9
... tensile specimen. Loading is vertical in the image Fatigue Resistance Nonmetallic inclusions are known to have a deleterious effect on fatigue resistance, in general [ 6 , 10 , 13 ], and they can have a greater effect than composition, microstructure, or stress gradients [ 6 , 10 ]. However...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.med.c9001606
EISBN: 978-1-62708-226-6
... requirement of excellent biocompatibility, these implants must possess high strengths and exhibit exceptional resistance to fatigue. 3 It has been estimated that fixation implants may be subjected to repeated stressing in excess of 10 6 cycles per year. 4 Chemically, the resistance to all forms...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001907
EISBN: 978-1-62708-217-4
... of the parts being machined rather than forged. The same advantages apply to threads that are rolled rather than cut. Carburization raises the surface hardness of the part and is usually beneficial with respect to surface wear and fatigue resistance. However, the increased surface hardness made...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001299
EISBN: 978-1-62708-215-0
... The catastrophic fracture was attributed to the presence of a subsurface defect in the form of a lone hard refractory inclusion in the critically loaded pin radius zone, which became the initiation site for a hidden fatigue crack. The uncleanliness of the material further reduced its fatigue resistance. Remedial...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001533
EISBN: 978-1-62708-225-9
... and resistance to fatigue failure of a sliding bearing babbit bush. For this reason, the investigation described in this article was completed to determine the causes of babbit bush failure in the process of steam turbine operation for the effect of grain size of babbit constitutive phases on bush wear...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001819
EISBN: 978-1-62708-180-1
.... Information on the toxicity of various metals is available in the article “Toxicity of Metals” in Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, Volume 2 of the of ASM Handbook. Fatigue resistance is another general requirement for implants, but the critical loading...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001370
EISBN: 978-1-62708-215-0
.... The chemical composition of the material indicated only 0.19% C, compared with the 0.4% C specified as the standard composition of En 8 steel. A lower carbon content results in a lower ultimate tensile strength. The fatigue resistance of a material is directly proportional to its tensile strength...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001459
EISBN: 978-1-62708-234-1
... as shown in a tensile test nor the resistance to rupture when tested as a notched bar. In fatigue, a crack originates at a sensitive spot and it also develops away from that spot without the accompaniment of any major plastic deformation, consequently ductility and toughness are called upon only...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0046210
EISBN: 978-1-62708-235-8
...: Poor-quality material with low fracture and fatigue resistance Poor machining, which initiates cracks that propagate to failure by a fatigue mechanism in service Excessive stresses associated with abusive use or failure of other components in the system to operate according to design...