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aircraft rotor blades

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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 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
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001757
EISBN: 978-1-62708-241-9
.... Based on the results, the cause of the fractured blade was high-amplitude fatigue due to severe stall. After normal engine usage of five months, the blade fractured sending fragments throughout the combustion and turbine sections. aircraft rotor blades fatigue fracture work hardening stainless...
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...
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
... of a rotor blade. There have been no aircraft mishaps or loss of life directly related to premature failure of this part. The UH-1N Main Rotor Blade Grip was received as shown in Figure 1 , with a longitudinal crack approximately 9 inches in length along the leading edge of the grip body outer diameter...
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
... by design analysis. To improve the reliability and safety of these helicopters, a modification is now available in which a loss of nitrogen pressure in any of the main rotor blades is immediately indicated on the aircraft control panel. This allows the crew to abort the flight as soon as the problem...
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
... Have Been Prevented The tail rotor blade spar is the main structural component of the tail rotor blade system and is safety-of-flight critical. During flight, the tail rotor blade failed and the outer section of the blade separated from the aircraft. The crew executed a successful emergency...
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
... , 1996, and “ Evaluating Corrosion Fatigue ” in Corrosion: Fundamentals, Testing, and Protection , Volume 13A of ASM Handbook , 2003. Two aircraft engine compressor rotors sustained damage during operation. Blades from both rotors were found sheared off, and several blades were lifted from...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001756
EISBN: 978-1-62708-241-9
... in the dovetail region, causing extensive damage throughout the turbine. Remedial measures were suggested to prevent such failures in the future. aircraft turbine blades fatigue fracture operating overload nickel-base alloy fatigue cracking fractographic analysis fracture surface structure Nimonic...
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
.... The crew executed a successful emergency landing. Subsequent inspection revealed that the spar of one tail rotor blade had failed and that the entire air foil section had departed the aircraft. There was no strike damage evident. The outboard departed section was never recovered. The tail rotor blade...
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
... for the main rotor blades to the main rotor drive shaft. The pillow blocks, which are attached to the yoke by four bolts, provide the pivot point for rotor control and are the main attachment point for the rotor drive shaft. During a hovering exercise a loud bang was heard, followed immediately by severe...
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
... were made. Helicopters Shot peening Spindles Plated steel Fatigue fracture Surface treatment related failures The spindle of a helicopter-rotor blade ( Fig. 1a ) fractured after 7383 h of flight service, causing the aircraft to crash. These spindles were overhauled and inspected...
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
... a number of different rotors. The configuration for the present test is shown in Fig. 1 . The rotor was a right-hand rotation 7.5 m (25 ft) diam propeller with three blades. The purpose of the wind tunnel tests was to define the propulsive performance of the rotor. Fig. 1 PTR with three-bladed...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0006444
EISBN: 978-1-62708-217-4
...Abstract Abstract Helicopter rotor blade components that included the horizontal hinge pin, the associated nut, and the locking washer were examined. Visual examination of the submitted parts revealed that the hinge pin, fabricated from 4340 steel, was broken and that the fracture face showed...
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 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...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003500
EISBN: 978-1-62708-180-1
... Distress damages Vibration Short/open circuit Failed components Sleeve bearing Seal Coupling Shaft Pinion/ball/turning gear Casing Rotor Impeller Shroud Piston Diaphragm Wheel Blades; foil, root, shroud Labyrinth Thrust bearing Pivoted pad bearing Roller/ball bearing Cross-head piston Cylinder...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003570
EISBN: 978-1-62708-180-1
... of engineering systems: blades in the low-pressure ends of steam turbines where the steam is “wet,” and aircraft, missiles, and helicopter rotors flying at high speeds through rainstorms. Much research has been devoted to liquid-droplet erosion, and good summaries can be found in Ref 2 and 7...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006753
EISBN: 978-1-62708-295-2
... that causes “g” forces that are outside of the operating envelope of the aircraft. Another example is inlet-flow blockage on a high-performance air compressor resulting in excessive cyclic loads applied to the blades, causing blade ( Fig. 21 , 22 ) and drive shaft ( Fig. 23 ) failures. Failure analysis...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006802
EISBN: 978-1-62708-329-4
.... , McClung R.C. , Kuhlman C.J. , Chell G.G. , and Lee Y. , “ A Probabilistically-Based Damage Tolerance Analysis Computer Program for Hard Alpha Anomalies in Titanium Rotors ,” Paper 2000-GT-0421, IGTI, ASME Turbo Expo , 2000 10.1115/2000-GT-0421 28. “ Aircraft Structural Integrity...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003568
EISBN: 978-1-62708-180-1
.... , Design and Performance of a High Velocity Air-Sand Jet Impingement Erosion Facility , Wear , Vol 220 , 1998 , p 95 – 112 38. Gladys N. and Laura V. , Analysis of Rotor-Blade Failure due to High Temperature Corrosion/Erosion , Surf. Coat. Technol. , Vol 120–121 , 1999 , p 145...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006815
EISBN: 978-1-62708-329-4
... on. The design specification also defines: Required off-design performance Cyclic life and creep life for engine components Overspeed capability Bird strike survivability Number of rotors Number of stages in compressors and in turbines Directions of rotation Maneuver G-load envelope...