1-20 of 340 Search Results for

couplings

Sort by
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c0047823
EISBN: 978-1-62708-236-5
... Abstract High-horsepower electric motors were utilized to drive large compressors (made of 4340 steel shafts and gear-type couplings) required in a manufacturing process. The load was transmitted by two keys 180 deg apart. Six of the eight compressor shafts were found cracked in a keyway...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c0090436
EISBN: 978-1-62708-233-4
... Abstract Molded plastic couplings used in an industrial application exhibited abnormally brittle properties, as compared to previously produced components. The couplings were specified to be molded from a custom-compounded glass-filled nylon 6/12 resin. An inspection of the molding resin used...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.marine.c9001617
EISBN: 978-1-62708-227-3
... Abstract Failures of various types of hydraulic couplings used to connect pipes in a naval vessel are described and used to illustrate some of the general procedures for failure analysis. Cracking of couplings, which were manufactured from nickel-aluminum- bronze extruded bar, occurred in both...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001117
EISBN: 978-1-62708-214-3
... Abstract Several tin plated, low-alloy steel couplings designed to connect sections of 180 mm (7 in.) diam casing for application in a gas well fractured under normal operating conditions. The couplings were purchased to American Petroleum Institute (API) specifications for P-110 material...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001190
EISBN: 978-1-62708-235-8
... Abstract Brass pipe couplings submitted for examination were deep-drawn from disks then annealed and subsequently cold threaded. Chemical analysis confirmed that the specified alloy Ms 63 was used for fabrication. Some of the pipe already showed fine cracks prior to their installation. In most...
Image
Published: 01 June 2019
Fig. 2 Male-stud couplings showing (a, b) longitudinal cracks and (c, d) circumferential cracks initiated from the bottom corner of the O-ring groove and the radius of the last thread, respectively More
Image
Published: 01 June 2019
Fig. 3 Schematic representation of the male-stud and straight couplings illustrating the number of locations (black arrows) where cracking was observed. (White arrows indicate different directions of crack growth observed on longitudinal fracture surfaces.) More
Image
Published: 01 June 2019
Fig. 5 Examples of some of the microstructures of the failed couplings (transverse, T; longitudinal, L). (a) A fine, homogeneous dispersion of the intermetallic precipitate phases κ IV , κ IIII , and κ III throughout the α matrix. (b) α-matrix grain boundaries decorated with an intermittent More
Image
Published: 01 June 2019
Fig. 6 Examples of some of the microstructures of the failed couplings (transverse, T; longitudinal, L). (c) Coarse α-matrix grains with a fine, spaced lamellar structure κ IIII phase at grain boundaries and a low concentration of κ IIV precipitates at grain interiors. (d) Large α-matrix More
Image
Published: 01 December 2019
Fig. 29 Macroscopic views of crimped nickel–aluminium–bronze hydraulic couplings after the ASTM mercurous-nitrate residual-stress test showing longitudinal and circumferential cracks ( arrowed ). Note silvery colouration owing to the presence of liquid mercury [ 38 ] More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c0089339
EISBN: 978-1-62708-233-4
... Abstract Leakage was identified around a coupling welded into a stainless steel holding tank that stored condensate water with low impurity content. The tank and fitting were manufactured from type 304 stainless steel. The coupling joint consisted of an internal groove weld and an external...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001614
EISBN: 978-1-62708-225-9
... Abstract The damage to a screw on the head of a 1.8 liter personal car engine was nucleated as the result of common disadvantageous environmental influences and reversed loads leading to corrosion fatigue. Automotive Screw steel Fatigue fracture Corrosion fatigue The seal coupling...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c0091292
EISBN: 978-1-62708-219-8
... Abstract A 25 mm (1 in.) copper coupling had been uniformly degraded around most of the circumference of the bell and partially on the spigot end. One penetration finally occurred through the thinned area on the spigot end of the pipe. Investigation supported the conclusion that although...
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
... Abstract An integral coupling and gear (Cr-Mo steel), used on a turbine-driven main boiler-feed pump, was removed from service after one year of operation because of excessive vibration. Spectrographic analysis and metallographic examination revealed the fact that gritty material in the gear...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001648
EISBN: 978-1-62708-234-1
... Abstract During a routine start-up exercise of a standby service water pump, a threaded coupling that joined sections of a 41.5 ft (12.7 m) long pump shaft experienced fracture. The pump was taken out of service and examined to determine the cause of fracture. It was apparent early...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001372
EISBN: 978-1-62708-215-0
... Abstract A coupling in a line-shaft vertical turbine pump installed in a dam foundation fractured after a very short time. The coupling material was ASTM A582 416 martensitic stainless steel. Visual, macrofractographic, and scanning electron microscopic examination of the coupling showed...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001382
EISBN: 978-1-62708-215-0
... Abstract A trunnion bolt that was part of a coupling in a metropolitan railway system failed in service, causing cars to separate. The bolt had been in service for more than ten years prior to failure. Visual examination showed that the failure resulted from complete fracture at the grease port...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001098
EISBN: 978-1-62708-214-3
... Abstract Six ASTM A-574 steel cap screws from a hydraulic coupling failed after 3 months in service. The screws were replacements for smaller-diameter cap screws that had been installed during an outage. Six new cap screws were examined along with the failed screws. Eight fracture locations...
Image
Published: 01 January 2002
Fig. 4 Prediction of coupled potential and galvanic current from polarization diagrams. i , current; i o , exchange current; E corr , corrosion potential More
Image
Published: 01 January 2002
Fig. 7 Corrosion rates in 3% NaCl solution of magnesium alloy AZ31B coupled with aluminum containing varying amounts of iron and magnesium. The corrosion rate of uncoupled AZ31B is shown for comparison. More