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Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001292
EISBN: 978-1-62708-215-0
... of the struts was recommended. Crack propagation Fractography Military planes Scanning electron microscopy 7049 UNS A97049 Fatigue fracture Background A crack was detected in one arm of the right-hand horizontal brace of the nose landing gear shock strut from a large military aircraft...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001027
EISBN: 978-1-62708-214-3
... was recommended, along with nondestructive inspection of the region at intervals determined by fractographic analysis of the fatigue crack growth. Bolted joints Drives Helicopters Military planes Shafts (power) 4340 UNS G43400 Corrosion fatigue Background The 4340 steel main rotor yoke...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001023
EISBN: 978-1-62708-214-3
.... The wear had been caused by incorrect machining of the shaft splines, which prevented the bevel gear nut from locating correctly against the gear. Aerospace engines Aircraft components Bevel gears Drives Engine components Jet planes Military planes Splines 16 NCD 13 Fretting wear...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001021
EISBN: 978-1-62708-214-3
... to be determined for the configuration of interest. Crack propagation Fatigue life Jet planes Military planes Wings (aircraft) AU4SG Fatigue fracture Background Following the crash of a Mirage III-0 aircraft, a small crack was detected in a bolt hole in the wing main spar. Because this area...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001024
EISBN: 978-1-62708-214-3
... designed heating element used to cure fiberglass repairs. Extrusions Fatigue failure Military planes 6061-T651 UNS A96061 Fatigue fracture Background About an hour after takeoff, a Marine Corps helicopter crashed, killing all on board. In the ensuing investigation, a large portion of one...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001030
EISBN: 978-1-62708-214-3
...). Control of machining parameters to prevent formation of brittle martensite, use of galvanically compatible fasteners, and use of an alternate lubricant were recommended. Airframes, corrosion Fasteners Jet planes Marine environments Military planes Solid lubricants Ti-6Al-4V UNS R56406 Stress...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001025
EISBN: 978-1-62708-214-3
... that the inspection interval be reduced to one-third of its original duration for the current level of inspection reliability, or that inspection procedures be improved in order that cracks substantially smaller than 13 mm (0.5 in.) can be reliably detected. Forgings Military planes 2014-T61 UNS A92014...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001295
EISBN: 978-1-62708-215-0
... conditions was the major cause of failure. Recommendations emphasized the need for a suitable shock absorber to be fitted at the constant-tensioning device of the winch system. Military applications Military planes Shock loading Fe-0.8C (Other, general, or unspecified) fracture Background...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001291
EISBN: 978-1-62708-215-0
... for fatigue crack growth during service. It was recommended that the damaged undercarriage struts be withdrawn from service pending further analysis and development of a repair technique. Crack propagation Military planes 35NCD16 Surface treatment related failures Intergranular fracture Fatigue...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001081
EISBN: 978-1-62708-214-3
... Military planes Turbine disks AM355 UNS S35500 Fatigue fracture Background Several compressor disks in military fighter and trainer aircraft gas turbine engines cracked prematurely in the bolt hole regions. The disks were made from precipitation-hardened AM355 martensitic stainless steel...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001026
EISBN: 978-1-62708-214-3
... before further processing and that foundry practices be reviewed to correct deficiencies leading to excessive hydrogen absorption during melting and casting. Castings Cleavage Martensitic stainless steels Military planes Supports Transgranular fracture Wings (aircraft) 17-4 PH UNS S17400...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006817
EISBN: 978-1-62708-329-4
... their technical report “Reliability-Centered Maintenance,” and this title gave the final version of the process the name by which it is known today. Once the DoD published Nowlan and Heap’s report, the U.S. military embarked on developing RCM processes for its own use, one for the U.S. Army, one for the U.S...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003504
EISBN: 978-1-62708-180-1
... published Nowlan and Heap's report, the U.S. military embarked on developing RCM processes for its own use, one for the U.S. Army, one for the U.S. Air Force, and two for the U.S. Navy, because the shipboard and aviation communities of the Navy insisted that a RCM process that worked for one would not work...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003516
EISBN: 978-1-62708-180-1
... loading corresponds to a tensile stress on the edges of the plate that tends to open the gap between the opposing crack surfaces. Mode II loading corresponds to shear stresses that tend to make the opposing crack surfaces slide relative to each other in the plane of the plate. Mode III loading corresponds...
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
... laboratories shall also be accredited to ISO 17025 standards. Please note that the U.S. government abandoned the military standard system for fasteners, and those standards have since been adopted by ASTM International and SAE International. Fastener Loads Design Load and Overload In a well-designed...
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
... stress raisers and unfavorable shear planes. Source: Ref 4 The shape and size of the head-to-shank fillet also have an important influence on fatigue performance. In general, the radius of this fillet should be as large as possible while at the same time permitting adequate head-bearing area...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006819
EISBN: 978-1-62708-329-4
... (discussed herein). Part 14 of the 2016 edition of API 579-1/ASME FFS-1, Fitness-for-Service (API 579) ( Ref 16 ) is generally consistent with ASME Section VIII, Division 2, but it also includes a modern Brown-Miller strain-life fatigue approach that can be coupled with a critical plane method...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006797
EISBN: 978-1-62708-295-2
... failures that have occurred at temperatures substantially above or below the design or fabrication temperature. Effect of Stress Raisers and Complex Stress States In sections that do contain stress raisers, net section yielding can still occur if the state of stress is plane stress; that is, one...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003573
EISBN: 978-1-62708-180-1
... failures that have occurred at temperatures substantially above or below the design or fabrication temperature. Effect of Stress Raisers and Complex Stress States In sections that do contain stress raisers, net section yielding can still occur if the state of stress is plane stress; that is, one...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003524
EISBN: 978-1-62708-180-1
... are moved in opposite directions, normal to the fracture plane. Generally, a saw cut can be made from the back of the fractured part to a point near the tip of the crack, using extreme care to avoid actually reaching the tip of the crack. This saw cut will reduce the amount of solid metal that must...