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Attachment bolts

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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
... Abstract Two titanium alloy wing attachment bolts from a commercial jetliner failed during the course of a routine service operation. Failure of the bolts occurred during the re-torque process as the wing was being reattached. Metallurgical failure analysis indicated that the fracture mechanism...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001907
EISBN: 978-1-62708-217-4
... Abstract Aircraft missile launcher attachment bolts fabricated from cadmium-coated Hy-tuf steel were found broken. Subsequent analysis of the broken bolts indicated three causes of failure. First, the bolts had been carburized, which was not in conformance with the heat treating requirements...
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
... Abstract The propeller from a small private airplane came off in flight. The head ends of all six attachment bolts remained in the propeller hub when it was found. Two threaded shanks with nuts remained with the engine, while the remaining four shank ends with their nuts were missing. Parts...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0091644
EISBN: 978-1-62708-217-4
... Abstract During a routine inspection on an aircraft assembly line, an airframe attachment bolt was found to be broken. The bolt was one of 12 that attach the lower outboard longeron to the wing carry-through structure. Failure occurred on the right-hand forward bolt in this longeron splice...
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Published: 01 June 2019
Fig. 6 Modified Goodman diagram for fatigue of the attachment bolts, with various loading cases indicated. 1 ksi ≡ 6.895 MPa More
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Published: 01 June 2019
Fig. 4 Example of failure remote from attachment bolt holes of spring leg. Note severe fretting, pitting, and polishing on the outboard side at lower end of leg. Fatigue started at indicated area of fretting marks. More
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Published: 01 June 2019
Fig. 1 Photograph of an as-received failed titanium wing attachment bolt More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0092142
EISBN: 978-1-62708-217-4
... Abstract During a routine inspection on an aircraft assembly line, an airframe attachment bolt was found to be broken. The bolt was one of 12 that attach the lower outboard longeron to the wing carry-through structure. Failure occurred on the right-hand forward bolt in this longeron splice...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001745
EISBN: 978-1-62708-217-4
... Abstract A 2000-T6 aluminum alloy bracket failed in a coastal environment because corrosive chlorides got between the bracket and attachment bolt. The material used for the part was susceptible to stress corrosion under the service conditions. Cracking may have been aggravated by galvanic...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001692
EISBN: 978-1-62708-229-7
... missing and another broken. It was not clear at the outset whether one blade had detached and struck the second blade, causing it to break, or whether there had been a structural failure within the broken blade leading to out-of-balance and overload of the other at the attachment bolts. From the evidence...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.pulp.c0090276
EISBN: 978-1-62708-230-3
... paper during manufacturing. The typical components consist of a cast iron shell, two cast iron concave heads, and a large cast iron internal center stay attached to journals. The heads are attached to the shell and center stay with high-strength bolts. FEA and metallurgical investigation supported...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001902
EISBN: 978-1-62708-217-4
... edges of lower attachment bolt holes. The nucleus of each fatigue crack is indicated. Magnification about 1.5 times. Fig. 3 Enlarged view of small incipient crack at the attachment hole, showing oxidation and “beach marks”. It is typical of a high-cycle low-stress fatigue crack, from which...
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Published: 01 June 2019
Fig. 1 (a) Parallel lines of corrosion on the shank of a PH13-8Mo stainless steel aircraft attachment bolt. (b) Close-up of fracture surface of bolt showing corroded area. Arrows point to one possible crack arrest line. (c) Scanning electron microscopy fractograph of area B in (b). Note More
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Published: 01 June 2019
Fig. 2 Brittle fracture originating from three small fatigue cracks (arrows) at chamfered edges of lower attachment bolt holes. The nucleus of each fatigue crack is indicated. Magnification about 1.5 times. More
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Published: 01 June 2019
Fig. 3 Corroded surface of fracture shown in Fig. 1 . Note severe fretting corrosion products (red-brown “mud” appearance) at and near two origins (O 1 and O 2 ) at the bottom outboard attachment bolt hole. Inset shows close-up of O 2 depicting “beach marks”. More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001903
EISBN: 978-1-62708-217-4
... severe pitting corrosion (arrow). Magnification 100 times; 2 pct Nital. Fig. 3 Corroded surface of fracture shown in Fig. 1 . Note severe fretting corrosion products (red-brown “mud” appearance) at and near two origins (O 1 and O 2 ) at the bottom outboard attachment bolt hole. Inset shows...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c9001524
EISBN: 978-1-62708-221-1
... from this microcrack. Scanning electron microscopy showed an overload crack extended across the remaining cross section of the chord. It was concluded that the presence of the bolt hole used to attach the gusset plate to the chord created a stress riser adjacent to the hole. Repeated high tensile...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c9001437
EISBN: 978-1-62708-220-4
.... The first indication of latent trouble was provided by the bolts which attached the stirring paddles to the shaft and the stationary scraper blades to the shell, either failing in service or breaking off when an attempt was made to remove them. It was the practice to renew them all annually. Microscopic...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c9001139
EISBN: 978-1-62708-221-1
... Abstract A truck-mounted hydraulic crane had a horizontal thrust bearing with one race attached to the truck and the other to the rotating crane. The outside race of the bearing was driven by a pinion gear, and it is through this mechanism that the crane body rotated about a vertical axis...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c9001431
EISBN: 978-1-62708-221-1
... sections which were gusseted and fitted with additional doubling plates in the corners where the jointing bolts were fitted. It was evident that the collapse was due to failure of the welds attaching the corner angles to an end frame. Many of the welds at the locations where failure occurred were of poor...