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Structural bolts

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c9001204
EISBN: 978-1-62708-219-8
... Abstract Two bolts from the stressed structure of a church building that had broken during stressing were examined to establish the cause of fracture. The fracture of one of the first bolt occurred in a double-vee groove weld whose root was not completely welded. The second bolt had cracked...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c0047113
EISBN: 978-1-62708-219-8
... Abstract A portion of a 19 mm (0.75 in.) diam structural steel bolt was found on the floor of a manufacturing shop. This shop contained an overhead crane system that ran on rails supported by girders and columns. Inspection of the crane system revealed that the bolt had come from a joint...
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Published: 01 June 2019
Fig. 1 Failure of a structural steel bolt in the rail assembly of an overhead crane. (a) Illustration of the crane rails and attendant support beams. (b) Shank portion of the failed bolt. (c) Fracture surface of the bolt showing evidence of reversed-bending fatigue More
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Published: 01 December 2019
Fig. 2 The simplified mechanic model of the blade bolt structure More
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Published: 01 December 2019
Fig. 7 Metallographic structure of a broken bolt More
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Published: 01 December 1993
Fig. 13 Microstructure of a vendor B bolt. Structure consists almost entirely of tempered martensite. Prior austenite grain size ASTM 4 and 5. Vilelia etch, 67× More
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Published: 01 December 1993
Fig. 14 Fine tempered martensitic structure in a vendor A bolt. ASTM grain size 9 to 10. Vilelia etch, 67× More
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001777
EISBN: 978-1-62708-241-9
... the collapse. The results of each of these steps of investigation are described in the following, and some final conclusions are formulated. Structural Analysis After the on-site visual inspection and sampling of key parts—steel plates, bolts, welded joints, and fractured surfaces—the structural...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c0047234
EISBN: 978-1-62708-233-4
... this fracture-initiation area showed fatigue striations. No casting or metallurgical structural defects were found that could explain the failures. This evidence supports the conclusion that cracking was a result of the stress-concentration site at the bolt holes where a fatigue-initiated fracture occurred...
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
... failure of structural members. While aircraft manufacturers have gone to great lengths to characterize the parameters affecting the performance of bolted joints, their practices do not necessarily extend to ongoing service operations. Particularly in the case of older aircraft, the original materials...
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...
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...
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Published: 01 January 2002
Fig. 4 Schematic showing the springlike effect of loading conditions on bolted joints. (a) Theoretical load condition for an elastic fastener and a rigid structure. (b) Ideal relationship of bolt load to working load with an elastic fastener and a rigid structure. (c) Actual relationship (both More
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Published: 30 August 2021
Fig. 3 Schematic showing the springlike effect of loading conditions on bolted joints. (a) Theoretical load condition for an elastic fastener and a rigid structure. (b) Ideal relationship of bolt load to working load with an elastic fastener and a rigid structure. (c) Actual relationship (both More
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
... desirable directional properties such as tensile strength and ductility, and dynamic properties such as impact toughness, fracture toughness, and fatigue strength. With respect to structural integrity, forged parts are generally free from voids and porosity. All of these properties for the bolts under...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c9001678
EISBN: 978-1-62708-218-1
... and stripping the nuts from the other two bolts, which remained unbroken. SEM fractography of the fracture surfaces of the four broken bolts indicated that the failure was due to reversed bending fatigue. Optical microscopy indicated that the bolts were heat treated to a tempered martensite structure...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001835
EISBN: 978-1-62708-241-9
... are given in this section. Blade Force Analysis The blade and its 48 M24 bolt connection structure are simplified into a cantilever beam, and the bolts constrain is considered to be the clamped end, as shown in Fig. 2 . The body coordinate system has its origin o in the center of the hub...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001388
EISBN: 978-1-62708-215-0
..., and the upper revolving structure, including a boom and an operation room, fell to the ground. The operator was not injured. The crane had been in use for approximately 10 years. Five years before, it was found that several connecting bolts had failed and fallen out from the base carrier. At that time, all...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c0046737
EISBN: 978-1-62708-229-7
... Abstract After 14 months of service, cracks were discovered in castings and bolts used to fasten together braces, posts, and other structural members of a cooling tower, where they were subjected to externally applied stresses. The castings were made of copper alloys C86200 and C86300...
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
... stresses on the chord during the lifting of enormous loads initiated a fatigue crack in the weld region adjacent to the bolt hole. Bolted joints Cranes Mining Repair welding Stress concentration Structural steel Fatigue fracture Failure analysis is like being a detective trying to solve...