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rotor stages

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Image
Published: 01 December 2019
Fig. 2 Photographs of ( a ) the damaged and fractured rotor blade on 17th stage ( b ) damaged stator vane More
Image
Published: 01 December 2019
Fig. 3 ( a ) Photograph of the fractured rotor blade from the 16th stage showing an origin at the trailing edge. ( b ) SEM image illustrating the minute fatigue striations More
Image
Published: 01 December 2019
Fig. 4 ( a ) Photograph of the fractured rotor blade on 16th stage showing dent at the trailing edge. ( b ) EDS spectrum representative of the dent area 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
... in a failed control rotor spar tube assembly made of cadmium-plated AISI 4130 Cr-Mo alloy steel. Inadequate design was responsible for the failure. A lower tine of the main rotor blade cuff failed in fatigue. The rotor blade cuff was forged of 2014-T6 aluminum alloy. Initial stages of crack growth displayed...
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
... 0.04 0.11 Bal 16th blade measured 0.13 0.58 0.51 0.019 0.003 0.35 11.98 0.13 0.09 Bal 17th blade measured 0.13 0.42 0.47 0.018 0.001 0.33 11.63 0.01 0.05 Bal Fig. 3 ( a ) Photograph of the fractured rotor blade from the 16th stage showing an origin at the trailing...
Image
Published: 30 August 2021
Fig. 1 Failed gas turbine rotor. From left to right: first-, second-, and third-stage turbine blades. The failure originated in the second stage; fragments of the second-stage blades damaged the downstream third-stage blades. The first-stage blades were relatively undamaged. More
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
... by a curvic coupling which locates the drum and shaft and transmits the turbine drive. Compressor stator assembly consists of a series of vanes welded on the outer platform to form a ring behind each row of rotor blades in each stage. The HP nozzle guide vane (NGV) assembly is positioned on the rear...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001758
EISBN: 978-1-62708-241-9
... stress condition. Note the three different stages of creep strain accumulation. Permission B. McCabe, American Metallurgical Consultants [ 2 ] Fig. 4 Schematic showing general stress-rupture curve shape for three different temperatures. Note rupture life decreases with increasing temperature...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c9001576
EISBN: 978-1-62708-219-8
... Abstract Macrofractographs of the fracture surface from a multibladed fan showed that cracks started at the corner where bending stress was concentrated and propagated through the blade by fatigue. Peak stress at the monitoring position was less than 10 MPa. To simulate crack growth, the rotor...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001830
EISBN: 978-1-62708-241-9
... of starts were 95,000 h and 4,785 times, respectively. The operating hours are listed in Table 1 . The catastrophic failure caused heavy damages to the rotor and the casing. The marriage bolts of the rotor, the second stage buckets, and the shaft experienced high degradation. Approximately all turbo...
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
... in magnitude. Some of these stress cycles were sufficiently small that they may not have caused fatigue crack growth, particularly in the initial stages of crack growth. Fig. 11 Output of strain gages attached to an operating main rotor blade at the locations shown in Fig. 2 , indicating that in each...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c9001578
EISBN: 978-1-62708-233-4
... of the furnace, so changing from one frequency to another did not eliminate the striping problem. Increasing the frequency made the stripes closer together, and decreasing the frequency resulted in the stripes being further apart. A solution to the striping problem was found by analogy with rotor stabilization...
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
... at the opposite end of the rotor, the turbine operating without the last stage blading for the remainder of the winter season. When the blades were examined after removal it was found that two—Nos. 28 and 111—had broken and that two others-Nos. 27 and 89—showed cracks in the root teeth. Three blades were...
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.chem.c9001399
EISBN: 978-1-62708-220-4
... that the rotor was a replacement to one which failed in an almost identical manner some 12 months earlier. Fig. 1 Damage to air compressor Impeller. A section of the first stage impeller was subsequently received for examination and visual inspection revealed cracking on the back plate between...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001724
EISBN: 978-1-62708-234-1
... Abstract Forged austenitic steel rings used on rotor shafts in two 100,000 kW generators burst from overstressing in a region of ventilation holes. A variety of causes contributed to the brittle fractures in the ductile austenitic alloy, including stress concentration by holes, work hardened...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001851
EISBN: 978-1-62708-241-9
... grcm) Fig. 16 Frequency response (N = 6000 tr/min, α = 2°, m B e = 10 grcm) Abstract Shaft misalignment and rotor unbalance contribute to the premature failure of many machine components. To understand how these failures occur and quantify the effects, investigators developed...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001473
EISBN: 978-1-62708-229-7
... direction of rotation was such that, under normal operating conditions, the journal loads were imposed on the top halves of the bearings. A flexible coupling was interposed between the turbine rotor and the pinion while the coupling between the main gear wheel and the alternator rotor was of the solid...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001666
EISBN: 978-1-62708-229-7
... and refurbishment. A total of six rotor assemblies have been removed from service under the program. In three of these, discs were removed, inspected, completely refurbished and returned to service but no cracks were found. The other three removed rotors were not disassembled but were subjected to rigorous...
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
... of the blades from the third and fourth stages were sheared off, and in the second rotor, most of the blades on the first four stages were sheared off. In both cases, downstream damage was observed emanating and progressively decreasing from the stages that released sheared blades. Several mounting...