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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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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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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 Mechanisms and Appearances of Ductile and Brittle Fracture in Metals
> Failure Analysis and Prevention
Published: 01 January 2002
Fig. 42 Radial marks typical of crack propagation that is fastest at the surface (if propagation is uninfluenced by the configuration of part or specimen)
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in Mechanisms and Appearances of Ductile and Brittle Fracture in Metals
> Failure Analysis and Prevention
Published: 01 January 2002
Fig. 43 Chevron patterns typical when crack propagation is fastest below the surface. It is also observed in fracture of parts having a thickness much smaller than the length or width (see middle illustration in Fig. 40 ).
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in Mechanisms and Appearances of Ductile and Brittle Fracture in Metals
> Failure Analysis and Prevention
Published: 01 January 2002
Fig. 46 Crack propagation in shear bands in a 7075-T6 plate specimen. Shear banding has occurred on four planes of high shear stress (two containing the width direction and two containing the thickness direction). Crack initiation has occurred in multiple locations, including the edge
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Published: 01 January 2002
Fig. 44 SEM views of intergranular facets within fatigue crack propagation area of cold-worked electrolytic tough pitch copper tested in rotating bending at moderately low stress
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in Elevated-Temperature Life Assessment for Turbine Components, Piping, and Tubing
> Failure Analysis and Prevention
Published: 01 January 2002
Fig. 6 Crack propagation through delta ferrite and sigma phases in type 347 stainless steel. Source: Ref 3
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Published: 01 January 2002
Fig. 3 Change in surface roughness due to crack propagation. Fracture surface roughness increases with distance of propagation, crack propagation rate, and decreased strength level. This component failed in fatigue. Crack initiation was on a longitudinal plane visible at the top in a surface
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Published: 01 January 2002
Fig. 29 Mechanical twins likely nucleated by cleavage crack propagation in a Fe-Cr-Mo alloy. Specimen taken from high strain rate, expanded tubing. Nomarski contrast illumination. Source: Ref 44
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Published: 01 January 2002
Fig. 32 Macroscale brittle crack propagation due to combined mode I and mode II loading. As cracks grow from the preexisting cracklike imperfection, crack curvature develops because of growth on a plane of maximum normal stress. Source: Ref 11
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Published: 01 January 2002
Fig. 42 Fatigue crack propagation rate versus stress intensity factor range. Fatigue striations may be present on the fracture surface for loading in the linear portion of the curve (Paris Law region), and permit analytical estimations of life to fracture. Just as fracture toughness varies
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in Failed Main Rotor Pitch Horn Bolt from an Army Attack Helicopter
> Handbook of Case Histories in Failure Analysis
Published: 01 December 1993
Fig. 3 Fracture surface showing the various crack propagation zones (represented by arrows). “I” represents intergranular, while “D” represents ductile. 5.33×
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in Fatigue Failure of a 1000 mm (40 in.) Diam Trailer Wheel at the Bolt Holes
> Handbook of Case Histories in Failure Analysis
Published: 01 December 1992
Fig. 1 (a) Hub area of wheel that failed by crack propagation from hole to hole. (b) and (c) Higher-magnification views.
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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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in Stress Corrosion Cracking of Ring Type Joint of Reactor Pipeline of a Hydrocracker Unit
> Handbook of Case Histories in Failure Analysis
Published: 01 December 2019
Fig. 7 Etched microstructures showing transgranular mode of crack propagation in the ring gasket of the RTJ: ( a ) multiple crack initiation on the surface (arrows), and ( b ) inside the material
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