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Book Chapter

Crack Propagation of Sirocco Fan

By Katsumi Sakaguchi, Masakatsu Kubo
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...
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 was repeatedly deformed by a hydraulic fatigue tester. Comparison of striations of the failed blade with that of the tested one revealed the failed blade was loaded with more than 30 MPa of stress. These tests confirmed that the rotor and blades had sufficient strength to withstand up to 3x the stress of normal operation. The casing of the fan was vibrated at 10 to 60 Hz. Peak stress easily overcame 30 MPa, which was enough to initiate cracking. The fracture surfaces and starting position were the same as those on the failed fan. It was concluded that the exciting force from an air compressor caused blade failure.
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<span class="search-highlight">Crack</span> <span class="search-highlight">propagation</span> on fracture surface (arrow points to direction of <span class="search-highlight">crack</span> p...

Crack propagation on fracture surface (arrow points to direction of crack p...

in Failure Analysis of a Vehicle Engine Crankshaft > Handbook of Case Histories in Failure Analysis
Published: 01 December 2019
Fig. 6 Crack propagation on fracture surface (arrow points to direction of crack propagation) More
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SEM morphology of the area C; ( a ) the <span class="search-highlight">crack</span> <span class="search-highlight">propagation</span> ( b ) <span class="search-highlight">crack</span> tip

SEM morphology of the area C; ( a ) the crack propagation ( b ) crack tip

in Failure Analysis of the 18CrNi3Mo Steel for Drilling Bit > Handbook of Case Histories in Failure Analysis
Published: 01 December 2019
Fig. 3 SEM morphology of the area C; ( a ) the crack propagation ( b ) crack tip More
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Fatigue <span class="search-highlight">crack</span> <span class="search-highlight">propagation</span> region of device in Fig. 6 . <span class="search-highlight">Crack</span> <span class="search-highlight">propagated</span> fr...

Fatigue crack propagation region of device in Fig. 6 . Crack propagated fr...

in Fatigue Fracture of Titanium Alloy Knee Prostheses > Handbook of Case Histories in Failure Analysis
Published: 01 December 1993
Fig. 7 Fatigue crack propagation region of device in Fig. 6 . Crack propagated from upper left to lower right. More
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Typical <span class="search-highlight">crack</span> network, revealing an intergranular mode of <span class="search-highlight">crack</span> <span class="search-highlight">propagation</span>...

Typical crack network, revealing an intergranular mode of crack propagation...

in Liquid Metal Embrittlement of Flange Connector Studs in Contact With Cadmium > Handbook of Case Histories in Failure Analysis
Published: 01 December 1992
Fig. 9 Typical crack network, revealing an intergranular mode of crack propagation. 2% nital etch. 385×. More
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Ductile fatigue striations, <span class="search-highlight">crack</span> <span class="search-highlight">propagation</span> zone of Figure 5 .

Ductile fatigue striations, crack propagation zone of Figure 5 .

in Fatigue and Corrosion Fatigue Failure Surfaces of Concrete Reinforcement > ASM Failure Analysis Case Histories: Buildings, Bridges, and Infrastructure
Published: 01 June 2019
Fig. 7 Ductile fatigue striations, crack propagation zone of Figure 5 . More
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Fatigue <span class="search-highlight">crack</span> <span class="search-highlight">propagation</span> test

Fatigue crack propagation test

in Crack Propagation of Sirocco Fan > ASM Failure Analysis Case Histories: Buildings, Bridges, and Infrastructure
Published: 01 June 2019
Fig. 5 Fatigue crack propagation test More
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Observed <span class="search-highlight">crack</span> <span class="search-highlight">propagation</span> directions around manway.

Observed crack propagation directions around manway.

in Failure Analysis of a Crude Oil Storage Tank > ASM Failure Analysis Case Histories: Oil and Gas Production Equipment
Published: 01 June 2019
Fig. 2 Observed crack propagation directions around manway. More
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Longitudinal section, unetched. <span class="search-highlight">Crack</span> <span class="search-highlight">propagation</span> from slag streak to strea...

Longitudinal section, unetched. Crack propagation from slag streak to strea...

in Examination of a Blistered and Cracked Natural Gas Line > ASM Failure Analysis Case Histories: Oil and Gas Production Equipment
Published: 01 June 2019
Fig. 6 Longitudinal section, unetched. Crack propagation from slag streak to streak. More
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<span class="search-highlight">Crack</span> <span class="search-highlight">propagation</span> in transverse section A — A according to Fig. 2 , etch: ...

Crack propagation in transverse section A — A according to Fig. 2 , etch: ...

in Crankshaft with Torsion Fatigue Fractures in Inductively Surface-Hardened Crank Pin > ASM Failure Analysis Case Histories: Improper Maintenance, Repair, and Operating Conditions
Published: 01 June 2019
Fig. 4 Crack propagation in transverse section A — A according to Fig. 2 , etch: Nital. 8× More
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Effect of section size on resistance to <span class="search-highlight">crack</span> <span class="search-highlight">propagation</span>.

Effect of section size on resistance to crack propagation.

in Improper Fabrication Rotating Blades Results in Premature Failure > ASM Failure Analysis Case Histories: Processing Errors and Defects
Published: 01 June 2019
Fig. 5 Effect of section size on resistance to crack propagation. More
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Section, etch: Nital. 100 × Stress corrosion <span class="search-highlight">crack</span> <span class="search-highlight">propagation</span>.

Section, etch: Nital. 100 × Stress corrosion crack propagation.

in Fractured Lock Ring of Drum > ASM Failure Analysis Case Histories: Mechanical and Machine Components
Published: 01 June 2019
Fig. 4 Section, etch: Nital. 100 × Stress corrosion crack propagation. More
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Schematic showing directions of <span class="search-highlight">crack</span> <span class="search-highlight">propagation</span>, as indicated by chevron ...

Schematic showing directions of crack propagation, as indicated by chevron ...

in Failure Analysis of an Ammonia Refrigerant Condenser Tube > ASM Failure Analysis Case Histories: Chemical Processing Equipment
Published: 01 June 2019
Fig. 2 Schematic showing directions of crack propagation, as indicated by chevron marks More
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a). Etched in aqueous nitric acid 1:1 at 2 V for 3 min. <span class="search-highlight">Crack</span> <span class="search-highlight">propagation</span>, ...

a). Etched in aqueous nitric acid 1:1 at 2 V for 3 min. Crack propagation, ...

in Leaky Heating Coils of an Austenitic Chromium-Nickel-Molybdenum Steel > ASM Failure Analysis Case Histories: Failure Modes and Mechanisms
Published: 01 June 2019
Fig. 3 a). Etched in aqueous nitric acid 1:1 at 2 V for 3 min. Crack propagation, cross-section (Same area after different etching treatments). 200 × b). Etched in V 2 A pickling solution (50 ° C). Crack propagation, cross-section (Same area after different etching treatments). 200 × More
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<span class="search-highlight">Crack</span>-<span class="search-highlight">propagation</span> direction and origin identified on fracture test componen...

Crack-propagation direction and origin identified on fracture test componen...

in Compression Fracture of a Graphite-Epoxy Test Structure Due to a Buckling Instability > ASM Failure Analysis Case Histories: Failure Modes and Mechanisms
Published: 01 June 2019
Fig. 2 Crack-propagation direction and origin identified on fracture test component. (a) Optical micrograph. 0.4x. Crack origin is indicated by circled area. (b) Scanning electron micrograph of the circled area shown in (a). 5000x. Note river marks that coalesce in the direction of overall More
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Representative striations observed within the fatigue <span class="search-highlight">crack</span> <span class="search-highlight">propagation</span> reg...

Representative striations observed within the fatigue crack propagation reg...

in Effect of Prior Processing on the Performance of PH 13-8 Mo Stainless Steel Helicopter Components > ASM Failure Analysis Case Histories: Air and Spacecraft
Published: 01 June 2019
Fig. 8 Representative striations observed within the fatigue crack propagation regions of each component. Magnification 5000× More
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Fractographic features of the <span class="search-highlight">crack</span> <span class="search-highlight">propagation</span> region in Figure 3

Fractographic features of the crack propagation region in Figure 3

in Investigation on a Damaged Propeller Blade > ASM Failure Analysis Case Histories: Air and Spacecraft
Published: 01 June 2019
Fig. 4 Fractographic features of the crack propagation region in Figure 3 More
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SEM image of <span class="search-highlight">crack</span> <span class="search-highlight">propagation</span> zone B

SEM image of crack propagation zone B

in Failure Investigation of the Wind Turbine Blade Root Bolt > Handbook of Case Histories in Failure Analysis
Published: 01 December 2019
Fig. 10 SEM image of crack propagation zone B More
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Typical appearance of fatigue <span class="search-highlight">crack</span> <span class="search-highlight">propagation</span> and plastic deformation on ...

Typical appearance of fatigue crack propagation and plastic deformation on ...

in Analysis of Degradation and Failure Mechanisms that Develop in Hot Forging Die > Handbook of Case Histories in Failure Analysis
Published: 01 December 2019
Fig. 3 Typical appearance of fatigue crack propagation and plastic deformation on different fillets More
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The <span class="search-highlight">crack</span> <span class="search-highlight">propagation</span> route in interface of matrix and grain boundary that ...

The crack propagation route in interface of matrix and grain boundary that ...

in Failure Analysis of Ethylene Cracking Tube > Handbook of Case Histories in Failure Analysis
Published: 01 December 2019
Fig. 7 The crack propagation route in interface of matrix and grain boundary that present continuous carbide More