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fatigue resistance

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Published: 01 December 2019
Fig. 9 Fatigue resistance curves for AISI 4340H steel reproduced from [ Ref. 8 ]. The upper curve contained small inclusions, while the lower curve contained abnormally large inclusions More
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
... 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 reduction in welding...
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.bldgs.c0047113
EISBN: 978-1-62708-219-8
... 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. The bolts...
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
... 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 Weapons Military...
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
... 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 that the springs...
Image
Published: 15 January 2021
Fig. 3 Schematic of gradients in fatigue initiation driving force (shown as total stress) and fatigue resistance (fatigue strength) that can result in subsurface initiation in a case-hardened component. Total stress includes applied plus residual stress. The surface is located at the left More
Image
Published: 01 January 2002
Fig. 3 Schematic of gradients in fatigue initiation driving force (shown as total stress) and fatigue resistance (fatigue strength) that can result in subsurface initiation in a case-hardened component. Total stress includes applied plus residual stress. The surface is located at the left More
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006918
EISBN: 978-1-62708-395-9
... Crack Shielding Mechanisms in Polymers Engineering polymers often make use of crack shielding mechanisms to improve their fatigue resistance ( Ref 12 , 13 ). When extrinsic toughening mechanisms are present, the crack driving force near the tip of the fatigue crack tip, Δ K tip , is less than...
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
... 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 related to hardness values obtained after quenching...
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
... was used. The inadequacy of the material was further confirmed by the high inclusion density. The failed wire rope contained a very high population of essentially Al-Ca-Ti silicates in the form of stringers. Such stringers are detrimental to the fatigue resistance of the steel. 2 Fractographic...
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
.... It is generally accepted that many smaller wires provide better fatigue resistance, while fewer, larger wires provide better abrasion resistance. Independent wire rope cores (IWRC) provide better crushing resistance than fiber cores. Because of the complex geometry of the assembled wires, the ultimate tensile...
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
... always lubricated. The soft metals are sometimes used in thicknesses up to 6 mm (0.24 in.), but to increase fatigue resistance, the soft metals are coated or plated on a steel (or other stronger metal) backing in layers as thin as 25 μm. The major groups of soft metal bearing materials...
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
... 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 of localized and general corrosion...
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
... have a shallow surface layer in residual compression when finished with a fine cut. 5 This layer is beneficial to fatigue resistance. It is possible that the thick, uniform cold worked layer noted on the “A” material provided a surface compressive layer that may have been more resistant to fatigue...
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 Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006814
EISBN: 978-1-62708-329-4
...) The failure initiated as fatigue at the weld toe. Broek focused on the importance of fracture mechanics, a method of analysis that compares the resistance side (i.e., KIC ) to the demand side (stress and flaw size) of the equation. He argues for a holistic approach, meaning that the resistance side...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006806
EISBN: 978-1-62708-329-4
... supplanted by replaceable insert bearings made from multilayer laminated metals. To increase the fatigue resistance of the bearing material, often the soft metals are coated or plated on a steel (or other stronger metal) backing in layers as thin as 25 μm. With such an arrangement, fatigue failure can...
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
... investigation were compromised as a result 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...
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
... of sliding bearing bush failure in the process of operation have set the urgent tasks of finding the causes of failure and of increasing wear resistance and resistance to fatigue failure of a sliding bearing babbit bush. For this reason, the investigation described in this article was completed to determine...