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aircraft turbine blades

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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: 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 Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003512
EISBN: 978-1-62708-180-1
... fitting. (b) and (c) Crack origin location. (d) Two distinct fatigue-striation patterns that were correlated to the load profile shown in (e) Fig. 14 Replication and microstructural evaluation combined with stress-rupture testing as performed on turbine blades and heater tubes to estimate...
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
... is often quite different from a textbook definition. A component, in practice, is deemed to have failed when it can no longer perform its intended function safely, reliably, and economically. Any one of these criteria can constitute failure. For example, a steam turbine blade whose tip has eroded affects...
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 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 Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001081
EISBN: 978-1-62708-214-3
...Abstract Abstract Several compressor disks in military fighter and trainer aircraft gas turbine engines cracked prematurely in the bolt hole regions. The disks were made of precipitation-hardened AM355 martensitic stainless steel. Experimental and analytical work was performed on specimens from...
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
... by erosion ( Ref 34 , 35 , 36 , 37 ). In the petrochemical industry, process control valves ( Ref 37 ) and power recovery turbines ( Ref 18 , 38 ) are damaged by erosion. In chemical process industries, solids transport systems are damaged by erosion ( Ref 25 , 39 , 40 , 41 ). In the aircraft industry...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006787
EISBN: 978-1-62708-295-2
.... Navy Fig. 31 Different views of possible calcium-magnesium-alumino-silicate attack on a shipboard turbine blade under the platform in a marine gas turbine engine. Source: Ref 235 . Courtesy of U.S. Navy Fig. 32 Effect of sea salt (SS) and sodium sulfate mixture on calcium-magnesium...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006795
EISBN: 978-1-62708-295-2
.... In chemical process industries, solids-transport systems are damaged by erosion ( Ref 24 , 38 – 40 ). In the aircraft industry, damage has occurred to aircraft engines ( Ref 18 , 20 , 41 – 43 ). The devices for generation of renewable energy (solar panels, turbines of hydroelectric power stations, windmill...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003517
EISBN: 978-1-62708-180-1
...Abstract Abstract This article focuses on the life assessment methods for elevated-temperature failure mechanisms and metallurgical instabilities that reduce life or cause loss of function or operating time of high-temperature components, namely, gas turbine blade, and power plant piping...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006781
EISBN: 978-1-62708-295-2
... Fig. 1 Representative turbine entry temperature (TET) of a commercial aircraft turbine during one flight. Adapted from Ref 1 Fig. 7 Typical thermomechanical fatigue (TMF) waveforms used in laboratory testing. (a) In-phase TMF. (b) Out-of-phase TMF. Image (b) adapted from Ref 6...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003546
EISBN: 978-1-62708-180-1
... TMF cracks propagating into the substrate material of a thin-walled blade. Courtesy of Ashok Koul, Life Prediction Technologies, Inc. Fig. 6 Ships's service turbine generator casing showing critical planes A, B, and C on which stresses were determined by finite-element analysis during...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006785
EISBN: 978-1-62708-295-2
... and industries that have experienced SCC failures include (this list is not exhaustive): Aerospace: Aluminum alloys in structural aircraft components such as landing gear and wing components, stainless steel tubing used as part of the hydraulic or fuel systems, high-strength low-alloy steel...
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
... different levels. The simplest form of a failure is a system or component that operates, but does not perform its intended function ( Ref 13 ). This is considered a loss of function . A jet engine that runs but can only produce partial thrust (insufficient to enable an aircraft to take off) is an example...
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 Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003526
EISBN: 978-1-62708-180-1
... of the input requirements and limitations of the analyses are necessary to obtain meaningful results. Special-application FEA software has been developed to optimize the dynamic impact analysis process. These programs are used to model situations such as vehicle collisions, turbine blade containment...
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
... turbine blade taken from a failed engine and is asked to answer the question, “Was the airfoil exposed to temperatures higher than design specifications (i.e., overtemperature)?” The answer may be factored into finding the root cause of failure of the engine. Among other things, the metallurgist cuts...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006773
EISBN: 978-1-62708-295-2
... that limit the options of designers and thus make careful and thorough analysis crucial for their safe and reliable operation. Finite-element analysis is the tool of choice in the analysis of these very complex, severely loaded parts. Steady-state analyses of the blades and rotor of a turbine can show what...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003519
EISBN: 978-1-62708-180-1
.... However, it is a useful method of problem solving and decision analysis. The Kepner-Tregoe method is a structured problem-solving approach that first defines the problem in terms of what “is” and what “is not” as related to the questions of what, where, when, and extent. For example, gas turbine blade...