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crack propagation
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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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Published: 01 December 2019
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in Failure Analysis of the 18CrNi3Mo Steel for Drilling Bit
> Handbook of Case Histories in Failure Analysis
Published: 01 December 2019
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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.
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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×.
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in Fatigue and Corrosion Fatigue Failure Surfaces of Concrete Reinforcement
> ASM Failure Analysis Case Histories: Buildings, Bridges, and Infrastructure
Published: 01 June 2019
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in Crack Propagation of Sirocco Fan
> ASM Failure Analysis Case Histories: Buildings, Bridges, and Infrastructure
Published: 01 June 2019
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in Failure Analysis of a Crude Oil Storage Tank
> ASM Failure Analysis Case Histories: Oil and Gas Production Equipment
Published: 01 June 2019
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in Examination of a Blistered and Cracked Natural Gas Line
> ASM Failure Analysis Case Histories: Oil and Gas Production Equipment
Published: 01 June 2019
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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
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in Improper Fabrication Rotating Blades Results in Premature Failure
> ASM Failure Analysis Case Histories: Processing Errors and Defects
Published: 01 June 2019
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in Fractured Lock Ring of Drum
> ASM Failure Analysis Case Histories: Mechanical and Machine Components
Published: 01 June 2019
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in Failure Analysis of an Ammonia Refrigerant Condenser Tube
> ASM Failure Analysis Case Histories: Chemical Processing Equipment
Published: 01 June 2019
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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 ×
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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
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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×
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in Investigation on a Damaged Propeller Blade
> ASM Failure Analysis Case Histories: Air and Spacecraft
Published: 01 June 2019
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in Failure Investigation of the Wind Turbine Blade Root Bolt
> Handbook of Case Histories in Failure Analysis
Published: 01 December 2019
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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
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Published: 01 December 2019
Fig. 7 The crack propagation route in interface of matrix and grain boundary that present continuous carbide
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