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quantitative fractography

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001605
EISBN: 978-1-62708-217-4
... position, topology, and details of interactions with microstructural features. The aim of this investigation was to use quantitative fractography as a tool to extract information, including striation spacing and size of the stretched zone, in order to make a direct correlation with fracture mechanic...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003536
EISBN: 978-1-62708-180-1
... Abstract The quantitative characterization of fracture surface geometry, that is, quantitative fractography, can provide useful information regarding the microstructural features and failure mechanisms that govern material fracture. This article is devoted to the fractographic techniques...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001136
EISBN: 978-1-62708-229-7
... and flaw size at failure, coupled with quantitative SEM fractography using striation spacing methods, revealed that the cyclic stress amplitudes just prior to failure were much larger than expected, in this particular case. Subsequent improvements in fan design and fabrication have effectively alleviated...
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
... on the basis of quantitative fractography results is probably closer to the mean SII. Simulation Tests Spin-pit simulation tests were conducted on fully bladed disks in vacuum. Details of the spin-pit test apparatus are given in Ref 6 . Two loading sequences (constant amplitude and variable amplitude...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001292
EISBN: 978-1-62708-215-0
... crack on the inner face of the initial cracking. The approximate point at which the initial cracking ends (open arrow) is shown more clearly in Fig. 8 . Acid etched. 4.70× Quantitative Fractography To assist in establishing the time at which the initial cracking occurred, the investigators...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003542
EISBN: 978-1-62708-180-1
... is qualitative; readers who wish to learn more about the quantitative side of fractography of ceramics should consult the references given at the end of the article. The reference list also includes sources that will help readers explore various aspects of fractography of ceramics in more depth. Techniques...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003537
EISBN: 978-1-62708-180-1
... on fracture in 1996 and 1997 ( Ref 12 and 13 ) demonstrate the continued close coupling between fracture mechanics, macroscopic and microscopic continuum mechanics, finite element analysis, dislocation theory, and fractography. Better quantitative understanding of fracture progression and of its microscale...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001324
EISBN: 978-1-62708-215-0
...) before it was fractured open in the laboratory. Fig. 2 Secondary crack after it was fractured open in the laboratory. Testing Procedure and Results Surface Examination Scanning Electron Microscopy Fractography Both primary and secondary cracks were examined using a scanning...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001367
EISBN: 978-1-62708-215-0
... the inside, cooled in liquid nitrogen, and fractured open to enable analysis of a fracture surface. Standardless semi-quantitative scanning electron microscopy/energy-dispersive x-ray spectrometry (SEM/EDS) analysis revealed a high sodium content in the corrosion product ( Fig. 2 ). The base metal elements...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001365
EISBN: 978-1-62708-215-0
... removed from the impeller body. The maximum defect depth is about 2.5 mm (0.10 in.). Scanning Electron Microscopy/Fractography Several areas that appeared to have the most severe surface damage were sectioned from the impeller body and fractured open in the laboratory. These surfaces were...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001072
EISBN: 978-1-62708-214-3
... and the cover. Applications The impeller was from a multistage, centrifugal unit designed to carry moist air. The unit was operated in a chemical plant. Specimen Selection Because corrosion rendered the larger crack faces useless for scanning electron microscopy (SEM) with respect to fractography...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.med.c9001664
EISBN: 978-1-62708-226-6
... broken across the eighth hole (of nine holes) from the end of the plate. The detailed metallurgical failure analysis of the device, including metallography and fractography, is reported here. It was found that the device had adequate metallurgical integrity for the application for which it was intended...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006774
EISBN: 978-1-62708-295-2
... Abstract Engineering component and structure failures manifest through many mechanisms but are most often associated with fracture in one or more forms. This article introduces the subject of fractography and aspects of how it is used in failure analysis. The basic types of fracture processes...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006943
EISBN: 978-1-62708-395-9
...) With charging after damage due to aging, appearing as light streaks. Original magnification: 5000× Fig. 11 SEM/EDX spectrum obtained from a tungsten particle in a Pebax specimen Scanning Electron Microscopy Fractography and Micromechanisms of Fracture The fractography of polymers requires...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001114
EISBN: 978-1-62708-214-3
... of measurable plastic deformation was found. Testing Procedure and Results Surface Examination Scanning Electron Microscopy/Fractography Scanning electron microscopy/fractography was used to examine the fracture surface at the point of initiation. A crack was revealed at the toe of the weld ( Fig...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001774
EISBN: 978-1-62708-241-9
... the formation of polythionic acid in the process gas. ring type pipe joint fracture polythionic acid stainless steel transgranular fracture fractography creep strength 347 (austenitic wrought stainless steel) UNS S34700 321 (austenitic wrought stainless steel) UNS S32100 Introduction...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001281
EISBN: 978-1-62708-215-0
... segments. (a) Leading edges. (b) Trailing edges. Fig. 2 Representative leading (a) and trailing (b) edges of the nozzles. Testing Procedure and Results Surface Examination Scanning Electron Microscopy/Fractography Fig. 3 shows an area exhibiting missing coating. Examination...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001316
EISBN: 978-1-62708-215-0
... exhibited a distinguishable orientation. Scanning Electron Microscopy/Fractography Crescent-shaped, dished-out metal loss features observed metallographically (see next section) on the inside surfaces of the three separators were examined using a scanning electron microscope (SEM). Examination...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001026
EISBN: 978-1-62708-214-3
... The hardness of the part was 40 HRC, which was within specifications. No other quantitative mechanical tests were performed. Stress Analysis Analytical The largest flaw in the outboard flap support was the combined flakes 2 and 3, which formed a single preexisting crack 3.9 = (0. 15 in.) deep by 12.2...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003532
EISBN: 978-1-62708-180-1
... of quantitative metallography to the study of fractures ( Ref 14 , 15 , 19 , 20 , 21 , 22 , 23 ). Much of this work has used measurements made on polished sections taken parallel to the crack-growth direction. This work provides new insight into fracture processes and should be useful in failure analysis...