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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0046146
EISBN: 978-1-62708-217-4
... Abstract The torque-arm assembly (aluminum alloy 7075-T73) for an aircraft nose landing gear failed after 22,779 simulated flights. The part, made from an aluminum alloy 7075-T73 forging, had an expected life of 100,000 simulated flights. Initial study of the fracture surfaces indicated...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001029
EISBN: 978-1-62708-214-3
... Abstract Two investment-cast A356 aluminum alloy actuators used for handles on passenger doors of commercial aircraft fractured during torquing at less than the design load. Visual examination showed that cracking had occurred through a machined side hole. Fractography revealed that the cracks...
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Published: 01 June 2019
Fig. 9 Schematic diagram showing the addition of the torque (dotted line) due to lateral deflection on the spring during start/stop conditions. The solid line represents the torque due to the compression of the spring. The magnitude of the shear stress associated with the stress conditions More
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Published: 01 January 2002
Fig. 59 Crack (arrows) in casting that developed during torque testing. ∼1.1× More
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Published: 01 June 2019
Fig. 1 Aluminum alloy 7075-T73 landing-gear torque-arm assembly that was redesigned to eliminate fatigue fracture at a lubrication hole. (a) Configuration and dimensions (given in inches). (b) Fracture surface showing fatigue beach marks. Approximately 2× More
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Published: 30 August 2021
Fig. 38 Crack (arrows) in casting that developed during torque testing. Original magnification: ~1.1× More
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Published: 01 December 1992
Fig. 2 Crack (arrows) in the casting that developed during torque testing. 1.1×. More
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Published: 01 December 1992
Fig. 7 Fracture surface at torque rod mounting hole on fatigue tested sample 9. More
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Published: 15 May 2022
Fig. 18 Graph of the increase in torque as self-tapping screws are tightened into a molded-in pilot hole More
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Published: 15 May 2022
Fig. 3 Torque rheometry More
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Published: 15 May 2022
Fig. 4 Torque rheometry as a function of molecular weight More
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Published: 15 May 2022
Fig. 5 Torque rheometry as a function of parts per hundred of filler More
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Published: 15 May 2022
Fig. 6 Torque rheometry as a function of parts per hundred of lubricant More
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Published: 01 December 2019
Fig. 4 Removal torque (Nm) of the cylinder head bolts during the engine disassembly More
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...
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Published: 01 June 2019
Fig. 6 Fractograph of detrimentally over-torqued bolt. More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c9001424
EISBN: 978-1-62708-233-4
... case the machine was a 200 kW alternator, direct-driven by a diesel engine running at 750 rpm. Both the foregoing failures reveal the same basic weakness, i.e., insufficient rigidity when subjected to variations or reversals of torque. In the first case, the bars welded to the arms were inadequately...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0048626
EISBN: 978-1-62708-225-9
... Abstract Cadmium-plated high-strength steel bolts were used to facilitate quick disassembly of a vehicle. One bolt was found fractured across the root of a thread after being torqued in place for one week. The bolts were made of 8735 steel heat treated to a tensile strength of 1241 to 1379 MPa...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0089254
EISBN: 978-1-62708-225-9
... of the wedge-shaped middle rings fractured prior to having been fully torqued, preventing the sprocket from being locked to the shaft. “Woody” fracture features, as a result of decohesion between a high volume fractions of manganese sulfide stringers and the matrix, was revealed during examination...
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
... features typical of low stress intensity fatigue of aluminum alloys. The fatigue resulted from abnormal fretting owing to inadequate torquing of the main retention bolts. Aircraft maintenance engineers and owners were advised to adhere to specifications when torquing this joint. Aircraft components...