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installation torque

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c0090929
EISBN: 978-1-62708-236-5
... Abstract Size M5 x 0.8 mm, class 8.8 metric screws were failing during application, reportedly at the normal installation torque. Investigation (visual inspection, metallographic analysis, and unetched 8.9x fractographs) supported the conclusion that the fasteners failed via ductile overload...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c9001728
EISBN: 978-1-62708-236-5
... that failure was due to improper installation torqueing of the bolts. Aircraft components Aircraft Bolts Propellers Torque Steel Fretting wear Fatigue fracture Careful examination of flight log data, maintenance reports, accident reports, and statements of witnesses indicated...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001766
EISBN: 978-1-62708-241-9
... in an action essentially identical to an auger type drilling process. It should be noted that, per the anchor manufacturer’s information regarding installation, up to 6,000 ft-lbf of installation torque is acceptable. Fig. 1 As-received photograph of the failed anchor and an exemplar anchor...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001649
EISBN: 978-1-62708-234-1
... and service conditions can alter the frictional characteristics of the bolted joint components with time. Changes in materials and processes over time (e.g., lubricants such as MoS 2 and wet sealant composition) serve to further complicate the relationship between friction, installation torque, and bolt...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001379
EISBN: 978-1-62708-215-0
... Abstract The heads of two AISI 8740 steel bolts severed while being installed into an Army tank recoil mechanism. Both broke into two pieces at the head-to-shank radius and the required torque value had not been attained nor exceeded prior to the failure. A total of 69 bolts from inventory...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0048630
EISBN: 978-1-62708-217-4
... hydrogen embrittlement. The bolts broke at the junction of the head and shank. The nuts were, theoretically, installed fingertight. The failure was attributed to hydrogen embrittlement that had not been satisfactorily alleviated by subsequent baking. The presence of burrs on the threads prevented assembly...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0006409
EISBN: 978-1-62708-217-4
... Abstract Pitostatic system connectors were being found cracked on several aircraft. Two of the cracked connectors made of 2024-T351 aluminum alloy were submitted for failure analysis. The connectors had cut pipelike threads that were sealed with Teflon-type tape when installed. Longitudinal...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001845
EISBN: 978-1-62708-241-9
... Abstract Two clamps that support overhead power lines in an electrified rail system fractured within six months of being installed. The clamps are made of CuNiSi alloy, a type of precipitation-strengthening nickel-silicon bronze. To identify the root cause of failure, the rail operator led...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0006899
EISBN: 978-1-62708-225-9
... Sulfurization 410 UNS S41000 Hydrogen damage and embrittlement Type 410 stainless steel bolts were used to hold together galvanized gray cast iron splice case halves. Before installation, the bolts were treated with molybdenum disulfide (MoS 2 ) antiseize compound. The torque applied to these bolts can...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001721
EISBN: 978-1-62708-225-9
... easily have been compromised when the torque was applied to the bolts. Thus all three factors for the possibility of SCC are present for the bonnet screws. The main reason for the failures of the valve bonnet screws in valves installed after 1988 is believed to be due to increased bolt torque...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0048634
EISBN: 978-1-62708-225-9
... torqued to 80% of rated ultimate tensile strength into a predrilled aluminum alloy plate. This high torque (greater than normal installation) was used to speed the failure rate of the fasteners. After 335 h, a head was lifted with fingernail pressure from the shank of a fastener. Another was removed...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001094
EISBN: 978-1-62708-214-3
.... Circumstances Leading to Failure The screws were subjected to retorquing tests within 2 weeks after installation. Several screws fractured in a brittle manner, substantially below the rated torque loading. Pertinent Specifications The newly developed cadmium-coated type 410 martensitic stainless...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c9001660
EISBN: 978-1-62708-236-5
... of fastener is designed so that during installation, the nuts (collars) separate in half (torque off) leaving a portion of the collar tight against the bolt (pin) at a specified torque ( Figures 1 ). Pins from three different commercial sources were evaluated in the present investigation and are referred...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001789
EISBN: 978-1-62708-241-9
... rate is two to three times higher in Ni-Al bronze. Based on the results of this work, the likelihood of subcritical cracking under various conditions can be reasonably estimated, which, in the case at hand, proved to be quite high. union nut corrosion ammonia installation torque bronze crack...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006805
EISBN: 978-1-62708-329-4
... with an installation torque range of 7.3 to 8.5 N · m (65 to 75 lbf · in.). Dimpled fracture features indicated that the head cracks were caused by overload; however, chemical analyses, hardness tests, and microstructural examination showed that the fasteners were within specifications. Unused fasteners and nuts from...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001812
EISBN: 978-1-62708-180-1
... being installed on type 7075-T6 fasteners with an installation torque range of 7.3 to 8.5 N · m (65 to 75 in. · lb). Dimpled fracture features indicated that the head cracks were caused by overload; however, chemical analyses, hardness tests, and microstructural examination showed that the fasteners...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.marine.c9001703
EISBN: 978-1-62708-227-3
... ), the nut having been driven against it with sufficient force to leave a deep imprint, which may indicate that a torque well in excess of that specified was used when installing the nuts. What was assumed to be the corresponding washer from the unbroken stud was not damaged in this fashion. When an attemp...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001099
EISBN: 978-1-62708-214-3
... operated continuously for about 1000 h since its original installation, at which time it experienced a bearing failure due to inadequate lubrication. This occurrence was unrelated to the failure under discussion, but required disassembly of the impeller and diffusion vane components. In this compressor...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c9001578
EISBN: 978-1-62708-233-4
... information to an antenna and subsequently to an FM receiver-demodulator. The experimental setup was calibrated by putting one end of the drive shaft in a vice and applying 100 lbf torque to the other end. While the 100 lbf torque was applied, the output of the demodulator was measured with a voltmeter...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001095
EISBN: 978-1-62708-214-3
... the result of insufficient torque on the bolts. Bending fatigue ASTM A574 UNS K03104 Fatigue fracture Background A 20 ton polar crane motor fell during a 3400 kg (7500 lb) lift, narrowly missing personnel working beneath the crane. Witnesses reported that the motor fall was preceded...