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main rotor blades

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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.c9001024
EISBN: 978-1-62708-214-3
... Abstract A Marine Corps helicopter crash was investigated. Efforts were directed to the failure of one of the main rotor blades that had apparently separated in the air. The apparent failure of a blade integrity monitor (BIM) system was also considered. The rotor blade comprised a long, hollow...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001510
EISBN: 978-1-62708-217-4
... direction that must be considered of primary importance in material selection for design configuration. A Navy UH-1N helicopter main rotor blade grip manufactured from a 2014-T6 aluminum alloy forging failed because of a design flaw that left a high residual tensile stress along the short transverse plane...
Image
Published: 01 December 1992
Fig. 1 Plan diagram of the main rotor blade, showing the aluminum extrusion spar, the 26 fiberglass trailing-edge pockets, the hub and endcap fittings, and the approximate location of the separation. More
Image
Published: 01 December 1992
Fig. 2 Transverse diagram of the main rotor blade close to the point of separation, showing the extent of the flat fracture (arrows), the set-back for fairing-in the fiberglass pockets, and the location of strain gages in a prior test program. More
Image
Published: 01 December 1992
Fig. 11 Output of strain gages attached to an operating main rotor blade at the locations shown in Fig. 2 , indicating that in each revolution of the blade four tensile stress cycles of different magnitude were encountered. 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
... Abstract Fretting and/or fretting corrosion fatigue have been observed on such parts as main rotor counterweight tie rods, fixed-pitch propeller blades, propeller blade clamps, pressure regulator lines, and landing gear support brackets. Microcracks started from severe corrosion pits...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001144
EISBN: 978-1-62708-217-4
... the aircraft was landed. The helicopter main rotor blade spar fracture was analyzed by conventional and advanced computerized fractographic techniques. Digital fractographic Imaging Analysis of theoretical and actual fracture surfaces was applied for automatic detection of fatigue striation spacing...
Image
Published: 01 December 1992
Fig. 4 Pit located about 0.25 mm (0.0l in.) from the fracture plane near the origin on the bottom surface of the main rotor blade. More
Image
Published: 01 December 1992
Fig. 3 Concentric ring appearance, typical of fatigue crack growth, emanating from the pits along the bottom edge of the main rotor blade adjacent to the set-back for the fiberglass pockets. More
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
... of a military helicopter failed during a hovering exercise. Applications The main rotor yoke of the Royal Australian Air Force (RAAF) Iroquois helicopter provides the attachment for the main rotor blades to the main rotor drive shaft. The pillow blocks, which are attached to the yoke by four bolts...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001297
EISBN: 978-1-62708-215-0
... A helicopter tail rotor blade failed and separated during flight. Applications The tail rotor blade spar is the main structural component of the tail rotor blade system and is safety-of-flight critical. Circumstances Leading to Failure During flight, the tail rotor blade failed and the outer...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001298
EISBN: 978-1-62708-215-0
... A helicopter tail rotor blade failed and separated during flight. Applications The helicopter tail rotor blade provides anti-torque flight control as it reacts against the main rotor system. The tail rotor blade spar is the primary structural component of the tail rotor blade assembly and is safety...
Book Chapter

Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001412
EISBN: 978-1-62708-229-7
... r.p.m. turbine of continental manufacture, built in 1942. Following the discovery of a crack in the root of a blade in the last wheel at the h.p. cylinder end of the double exhaust l.p. rotor, and that an adjacent blade had cracked in the region of the inner lacing wire, the two defective blades were...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0046222
EISBN: 978-1-62708-217-4
... of the ASM Handbook . Investigation After the crash, four of the five rotor blades were found in the main impact area. The fifth blade was about 0.4 km ( 1 4 mile) away. The broken spindle was with this blade. The spindle had broken in the shank adjacent to the shoulder at the inboard end...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001636
EISBN: 978-1-62708-217-4
... Abstract A Lynx helicopter from the Royal Netherlands Navy lost a rotor blade during preparation for take-off. The blade loss was due to failure of a rotor hub arm by fatigue. The arm was integral to the titanium alloy rotor hub. An extensive material based failure analysis covered the hub...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001143
EISBN: 978-1-62708-229-7
... for in a macroscopic examination of a turbine is catastrophic failure. This is the separation of blades from the rotor and/or casing. In a turbine, a separated blade will normally impact other blades, damaging them and possibly causing them to separate. The damage will progress downstream from the initial point...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001380
EISBN: 978-1-62708-215-0
... Abstract One of the two AISI 4340 steel pitch horn bolts from the main rotor hub assembly failed while in service. Optical microscope revealed evidence of corrosion pitting in regions adjacent to the fracture. Fractographic examination utilizing a scanning electron microscope revealed multiple...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001484
EISBN: 978-1-62708-229-7
... bearings had been wiped and the rotor very slightly bent, and that one row of blades of the velocity wheel and four of the LP wheels themselves were badly damaged, the latter being cracked both in the radial and circumferential directions in the regions in which rubbing occurred. As the hub portions...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001079
EISBN: 978-1-62708-214-3
... passing between rotating blades mounted on the outside of the turbine rotor and stationary blades mounted on the inside of the turbine casing surrounding the turbine rotor. The turbine rotor in turn drives the generator rotor, which is housed in a stator where electricity is produced. Fig. 1 Steam...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006821
EISBN: 978-1-62708-329-4
... Handbook , 2003. Case Study 5: Failure Analysis of Engine Compressor Rotors Two aircraft engine compressor rotors sustained damage during operation. Blades from both rotors were found sheared off, and several blades were lifted from the dovetail portion of the drum. In one of the rotors, all...