1-20 of 1302 Search Results for

Fatigue fracture

Follow your search
Access your saved searches in your account

Would you like to receive an alert when new items match your search?
Close Modal
Sort by
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c0047846
EISBN: 978-1-62708-218-1
... was increased to 760 MPA by nitriding for 10 h at 515 deg C. Shock loading Stresses Vibration 8640 UNS G86400 Fatigue fracture The shaft shown in Fig. 1 was from a fuel-injection-pump governor that controlled the speed of a diesel engine used in trucks and tractors. Shafts in newly installed...
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
... Abstract Fatigue failure of engineering components and structures results from progressive fracture caused by cyclic or fluctuating loads. Fatigue is an important potential cause of mechanical failure, because most engineering components or structures are or can be subjected to cyclic loads...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c0046160
EISBN: 978-1-62708-224-2
... shifting during operation. Axles Cranes Forgings Torsional fatigue 4150 UNS G41500 Fatigue fracture A stepped drive axle used in a high-speed electric overhead crane broke after 15 months of service. The axle ( Fig. 1a ) was made from a hardened-and-tempered resulfurized 4150 steel forging...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c0048060
EISBN: 978-1-62708-224-2
... which indicated that the material was in the as-forged condition (which meant lower fatigue strength). The fracture was concluded to have occurred due to stress concentration in the root of the last thread. Normalizing of the crane hook after forging was suggested as a corrective measure. A stress...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c0048064
EISBN: 978-1-62708-224-2
... radius of the hook. Beach marks (typical of fatigue fracture) were found extending over approximately 20% of the fracture surface. Numerous cracks were revealed by macroscopic examination of the torch-cut surfaces. It was revealed by macrograph of an etched specimen that the cracks had initiated...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c0048102
EISBN: 978-1-62708-224-2
... Abstract A bridge wheel from a 272,160 kg stripper crane fractured in the web near the rim after one year of service. The wheel was forged from 1055 steel, and the tread, hub faces, and hub bore were machined. Beach marks indicative of fatigue at ten locations were revealed by macroscopic...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c0048073
EISBN: 978-1-62708-224-2
... confirmed failure of the shaft by fatigue fracture. As a corrective measure the shaft was replaced with one made of 4140 steel, quenched and tempered to a hardness of 286 to 319 HRB. The keyway was moved away from the change in section and was machined with a 1.6-mm radius in the bottom corners and a larger...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c0048031
EISBN: 978-1-62708-224-2
..., this wire rope was substituted by the more abrasion resistant 6 x 19 rope. Carbon Chemical composition Cranes Martensite Specifications Tensile Strength Fe-0.73C Fatigue fracture The wire rope on a crane in a scrapyard broke after 2 weeks of service under normal loading conditions...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c0089633
EISBN: 978-1-62708-220-4
... castings Stress concentraion Stuffing box 60-45-10 Casting-related failures Fatigue fracture The stuffing box shown in Fig. 1(a) was sand cast from ASTM A 536, grade 60-45-10, ductile iron and began leaking water after two weeks of service. The machine was operating at 326 rpm, with discharge...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c0048586
EISBN: 978-1-62708-218-1
... beach marks, indicative of fatigue cracking, starting at opposite sides of each stud, with final fracture occurring across the stud. Each failure occurred in the first thread of the stud. It was concluded that the wheel studs fractured by reversed-bending fatigue. To minimize the possibility...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c0046182
EISBN: 978-1-62708-218-1
... of the cap. The defect extended approximately 9.5 mm (3/8 in.) along the side of the cap. The fracture surface exhibited beach marks typical of fatigue. The surface of the defect was stained, indicating that oxidation occurred either in heat treatment or in heating during forging. Deep etching...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c0048592
EISBN: 978-1-62708-218-1
... of four bearing caps, two cap screws, and one universal-joint spider had fractured. Examination of the three fractured bearing caps and the spider showed no evidence of fatigue but showed that fracture occurred in a brittle manner. The bearing cap that was not destroyed still contained portions of the two...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c0089551
EISBN: 978-1-62708-218-1
... of the casting. The mass of a feeder-riser system located near the tear retarded cooling in this region, creating a hot spot. This supported the conclusion that the tear causing the fracture of the axle housing was formed during solidification by hindered contraction and was enlarged in service by fatigue...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c0047621
EISBN: 978-1-62708-229-7
..., and flange and more skillful welding techniques to avoid undercutting and unfused interfaces. Arc welding Combustion chamber Flanges Gas turbine engines Pipe fitting Undercuts Welding defects Inconel 718 (Nickel-base superalloy) UNS N07718 Fatigue fracture Joining-related failures...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c0047813
EISBN: 978-1-62708-229-7
... by fatigue. (Left) Section through pulverizer showing the inner main shaft that fractured, repaired itself by friction welding, and fractured a second time. (Right) Photograph of the friction welded surface The lower grinding ring of the pulverizer was attached to the outer main shaft ( Fig. 1 , left...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.rail.c0046238
EISBN: 978-1-62708-231-0
... had been magnetic-particle inspected by inserting a probe into the longitudinal hole. Evidence found supports the conclusions that the knuckle pins failed by fatigue fracture. The circular cracks at the longitudinal holes were the result of improper technique in magnetic-particle inspection. Thermal...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c0048039
EISBN: 978-1-62708-219-8
... of fractures: flat-type fractures were observed in 1.2 and 1 mm diam wires and cup-and-cone fractures were observed in 0.6 mm diam wires. A nick observed in the side of one of the larger wires was found to be rusted. Beach marks radiating inward, indicative of fatigue cracking, were also revealed. The smaller...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c0046242
EISBN: 978-1-62708-236-5
... teeth (found at visual inspection) was composed of the same material as the metal in the coupling. Beach marks and evidence of cold work, typical of fatigue failure, were found on the fracture surface. Chips remaining in the analysis cut were difficult to remove, indicating a strong magnetic field...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c0047558
EISBN: 978-1-62708-236-5
... Abstract The shaft of an exciter that was used with a diesel-driven electric generator broke at a fillet after ten hours of service following resurfacing of the shaft by welding. The fracture surface contained a dull off-center region of final ductile fracture surrounded by regions of fatigue...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c9001435
EISBN: 978-1-62708-236-5
... inclusions Shafts (power) Slags Weld defects Weld deposited coatings Welded steel Joining-related failures Fatigue fracture The fracture of the shaft of a 10 h.p. squirrel-cage motor took place at the driving end just outside the roller bearing and not at an abrupt change of section behind...