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failed shafts

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Published: 01 January 2002
Fig. 27 Fracture surfaces of failed shafts. (a) and (b) Failure by fatigue. (c) and (d) Failure by torsional shear. See text for discussion. More
Image
Published: 30 August 2021
Fig. 6 Fracture surfaces of failed shafts. (a) and (b) Failure by fatigue. (c) and (d) Failure by torsional shear. See text for discussion More
Image
Published: 01 December 2019
Fig. 1 Macrograph of the fractured shaft. ( a ) Failed shaft. ( b ) Close view of the fracture surface with cracks propagating at direction of 45°, approximately, to the shaft axis. ( c ) Permanently twisted deformation of spline teeth with cracks at root More
Image
Published: 01 December 1993
Fig. 2 As-received pieces from the failed shaft. The shaft portion that was removed from the runner hub is at the right. 0.17× More
Image
Published: 30 August 2021
Fig. 29 Fracture surface of failed shaft. Original magnification: 1.25× More
Image
Published: 30 August 2021
Fig. 39 Macroetched cross section through a failed shaft showing a repair weld overlay around the entire circumference as well as two keyways that had been filled in by welding More
Image
Published: 01 June 2019
Fig. 1 Two failed coal-pulverizer shafts. The broken shaft is on the right; the cracked shaft is on the left. The arrow indicates the position of the bowl end crack in the cracked shaft. More
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001763
EISBN: 978-1-62708-241-9
... are approximated as 50% of the ultimate tensile strength [ 9 ] Fig. 1 Macrograph of the fractured shaft. ( a ) Failed shaft. ( b ) Close view of the fracture surface with cracks propagating at direction of 45°, approximately, to the shaft axis. ( c ) Permanently twisted deformation of spline teeth...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001799
EISBN: 978-1-62708-241-9
... and ( b ) transverse cracks Abstract A high-speed pinion gear shaft, part of a system that compresses natural gas, was analyzed to determine why it failed. An abnormal wear pattern was observed on the shaft surface beneath the inner race of the support bearings. Material from the shaft had...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001287
EISBN: 978-1-62708-215-0
..., and mechanical (hardness and tensile properties) analyses of failed shaft specimens were conducted. The examinations showed that the shafts had failed by fatigue. It was recommended that a low-alloy steel (e.g., 3% Ni-Cr) in the hardened and tempered condition and subjected to shot-peening surface-hardening...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001808
EISBN: 978-1-62708-180-1
... Abstract This article discusses failures in shafts such as connecting rods, which translate rotary motion to linear motion, and in piston rods, which translate the action of fluid power to linear motion. It describes the process of examining a failed shaft to guide the direction of failure...
Image
Published: 01 December 2019
Fig. 4 Distribution of the von Mises stress of the shaft near the region secured with the pinion gear, where fracture occurred in a failed shaft (stress unit: MPa). ( a ) Maximum von Mises stress located at the root of spline tooth. ( b ) Twisted deformation of the spline teeth. Magnification More
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001368
EISBN: 978-1-62708-215-0
... Abstract A forged 4140 steel shaft that connected two runners in a hydroturbine failed catastrophically after approximately 5900 h of service. The runner and the mating section of the broken shaft were examined and tested by various methods. The results of the analyses indicated that the shaft...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c9001689
EISBN: 978-1-62708-233-4
... of duplex stainless steel and the manufacturer indicated to the owner, after examining the outer part of the failed shaft, that failure had been caused by fracture at an area of intense local overheating in service, which had produced extensive precipitation, resulting in embrittlement. The fracture...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001088
EISBN: 978-1-62708-214-3
... Abstract A 25 mm (1 in.) diam carrier shaft failed suddenly during operation. The shaft failed near the toe of the 4.8 mm (316 in.) frame-to-shaft 60 deg and 120 deg submerged metal arc (SMA) tack welds after an unknown time in service. Material specifications called for the shaft to be made...
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
... Abstract A service water pump in a nuclear reactor failed when its shaft gave way. The fracture originated in the threaded portion of the sleeve nut on the drive-end side of the shaft. Results of the failure analysis showed that the cracking initiated at the thread root as a result of corrosion...
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
... Representative micrographs showing ( a ) tempered martensitic, and ( b ) pearlite with proeutectoid ferrite network at grain boundary, in the cases of gearbox and clutch shaft, respectively Abstract Two shafts that transmit power from the engine to the propeller of a container ship failed after a short...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001790
EISBN: 978-1-62708-241-9
... in service for more than 30 years, failed shortly after the bearings were replaced. Examination of the shaft revealed cyclic fatigue, with a substantial distribution of nonmetallic inclusions near the fracture initiation site. Fracture mechanics analysis indicated that, if stresses acting on the shaft were...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001764
EISBN: 978-1-62708-241-9
...Results of the Optical Emission Spectroscopy Table 1 Results of the Optical Emission Spectroscopy The material chemistry of the failed Design 6 drive shafts and that of the nonfailed Design 1 and 6 drive shafts is very similar. Element, wt.% Failed Drive Shaft, Design 5/6 Nonfailed...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001371
EISBN: 978-1-62708-215-0
... Abstract A type 410 stainless steel circulating water pump shaft used in a fossil power steam generation plant failed after more than 7 years of service. Visual examination showed the fracture surface to be coated with a thick, spalling, rust-colored scale, along with evidence of pitting...