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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...
Book Chapter

Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0049796
EISBN: 978-1-62708-235-8
... Abstract Problems with materials compatibility were encountered in pyrotechnically driven devices used in a number of ordnance applications requiring rapid mechanical actuation. A fine bridgewire is located in contact with the chemical pyrotechnic, and the charge is ignited by electrical...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001361
EISBN: 978-1-62708-215-0
... Abstract A 17-4 PH steering actuator rod end body broke during normal take-off. Results of failure analysis revealed that the wall thickness of the race was much below the design limits, thus causing the race to rest on the body's swaged edges rather than on the load carrying centerline...
Image
Published: 01 January 2002
Fig. 38 Forged aluminum alloy 2014-T6 actuator barrel lug that failed by SCC. (a) View of the lug. 2×. Fracture at top was the initial fracture; arrow indicates location of a tiny region of pitting corrosion (on back side of lug) at which failure originated. Final fracture is at left. (b More
Image
Published: 01 June 2019
Fig. 1 Components for the mounting surface of a hydraulic actuator that failed in service because of galvanic attack on the aluminum alloy spacer. The galvanic attack occurred on the aluminum alloy spacer (a) when a vellum gasket (b) that separated the spacer from a nickel-plated steel housing More
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Published: 01 June 2019
Fig. 1 As-received actuator—note removal of paint and location of fracture. More
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Published: 01 December 1992
Fig. 1 Both sides of an as-received actuator casting. Arrow (b) indicates the hot tear cracks. More
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Published: 01 December 1993
Fig. 2 Broken steering actuator rod end. No environmental damage was apparent on the rod-end assembly 0.9× More
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Published: 01 June 2019
Fig. 5 Actuating link failure. More
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Published: 01 June 2019
Fig. 1 Cross section of a pyrotechnic actuator. More
Image
Published: 01 June 2019
Fig. 1 Forged aluminum alloy 2014-T6 actuator barrel lug that failed by SCC. (a) View of the lug. 2×. Fracture at top was the initial fracture; arrow indicates location of a tiny region of pitting corrosion (on back side of lug) at which failure originated. Final fracture is at left. (b More
Image
Published: 15 January 2021
Fig. 49 (a) Photograph of forged aluminum alloy 2014-T6 actuator barrel lug that fractured due to stress-corrosion cracking. Arrow indicates location of a region of pitting corrosion on back side of lug at which the fracture originated. Final fracture occurred at bottom left. (b) Micrograph More
Book Chapter

Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0046512
EISBN: 978-1-62708-234-1
... Abstract Immediately after installation, leakage was observed at the mounting surface of several rebuilt hydraulic actuators that had been in storage for up to three years. At each joint, there was an aluminum alloy spacer and a vellum gasket. The mounting flanges of the steel actuators had...
Book Chapter

Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c0090466
EISBN: 978-1-62708-218-1
... Abstract A production lot of mechanical hinges used in an automotive application had failed during incoming quality-control routine actuation testing. A change in part supplier had taken place between the approval of the prototype parts that performed acceptably and the receipt of the first lot...
Book Chapter

By B. K. Young, Jr.
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001734
EISBN: 978-1-62708-234-1
..., indicated that little stress had been applied to the part. Comparisons of the service failure and laboratory-induced failures in conjunction with macroscopic and metallographic observations showed that the bracket assembly failed because an intense, localized flame had melted the material. Actuator...
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Published: 15 January 2021
Fig. 16 Slider-on-flat-surface testing rig. (a) Overview. (b) Tool holder with load cells and actuator (A, normal load; B, friction force; C, load actuator). (c) Testing progression. Adapted from Ref 52 More
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001363
EISBN: 978-1-62708-215-0
... the pitch control thrust bearing set, head bolts, hub fork, and actuator rod end, were examined in more detail The thrust bearing set (52100 steel) was identified as the probable source of the uncommanded pitch angle change. A complete failure analysis of the bearing indicated that failure was precipitated...
Book Chapter

Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0091678
EISBN: 978-1-62708-217-4
... Abstract During a routine shear-pin check, the end lug on the barrel of the forward canopy actuator on a naval aircraft was found to have fractured. The lug was forged from aluminum alloy 2014-T6. Investigation (visual inspection, 2x views, and 140X micrographs etched with Keller's reagent...
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Published: 01 December 1992
Fig. 6 SEM micrograph showing a typical brittle overload fracture observed in a failed actuator casting. 315×. More
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Published: 01 December 1993
Fig. 2 Schematic of the collective pitch control system, showing the thrust bearing set, control tube, and actuator More