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crack initiation

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Published: 01 June 2019
Fig. 4 Detail crack initiation region in rail 5-1 suggesting merging of two cracks and mechanical damage on fracture surface. (a) 8.5×. (b) 130× More
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Published: 01 June 2019
Fig. 2 Inclusion shape near crack initiation site More
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Published: 01 June 2019
Fig. 1 Crack initiation on type 316LR stainless steel dynamic compression plate. (a) Anterior-posterior radiograph. The plate was used to treat the nonunion of a fracture between the fourth and seventh screws. The plate was bent intraoperatively to fit the contour of the bone. (b) Radiograph More
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Published: 30 August 2021
Fig. 96 (a) Metallographic cross section of failed weld showing crack-initiation location on the inside diameter (ID) of shell course 1. Note multiple weld passes. OD, outside diameter. (b) Detail of heat-affected zone microstructure next to crack revealing the presence of martensite. Etched More
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Published: 30 August 2021
Fig. 115 Fracture surface opened. Black arrows correspond to crack-initiation sites on the mating fracture surfaces More
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Published: 30 August 2021
Fig. 1 Schematic showing the relationship between crack initiation and propagation (preceding failure) as the number of cycles increases. Adapted from Ref 3 More
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Published: 01 June 2019
Fig. 2 Cracks initiated on the liquor side and penetrated the wall thickness. Magnification 2× More
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Published: 01 June 2019
Fig. 3 Cracking initiated at the spot welds and progressed into the base metal. Magnification 2× More
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Published: 30 August 2021
Fig. 53 Micrographs showing (a) transgranular crack initiating from a pit on the inner-diameter surface and (b) heat-affected zone comprised of a fine dendritic structure of ferrite and carbides surrounded by grain-boundary primary ferrite. Original magnification of both: 200× More
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Published: 30 August 2021
Fig. 19 Stainless steel boat shaft that failed by bending fatigue. Cracks initiated at surface gouges at the 1 and 5 o’clock locations. More
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Published: 01 December 1992
Fig. 1 Initiation of crack (upper left), two rows from complete fracture (right). 1.3×. More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.petrol.c9001512
EISBN: 978-1-62708-228-0
...Abstract Abstract When a large LPG low-carbon steel storage tank was put into service for the first time and filled beyond the proof testing level, a brittle fracture crack initiated at a fillet weld between a stiffener ring and the wall. The crack propagated to a length of 5.5 m and arrested...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.rail.c9001531
EISBN: 978-1-62708-231-0
...Abstract Abstract In this study, the failure modes of cartwheel and mechanical properties of materials have been analyzed. The results show that rim cracking is always initiated from stringer-type alumina cluster and driven by a combination effect of mechanical and thermal load. The strength...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c9001534
EISBN: 978-1-62708-220-4
... region at its root (lack of penetration). Component failure had started from this weld defect. The hydrogen absorbed during welding facilitated crack initiation from this weld defect during storage of the component after welding. Poor weld toughness at the low operating temperature facilitated crack...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001372
EISBN: 978-1-62708-215-0
... showed that the fracture was brittle and was initiated by an intergranular cracking mechanism. The mode of fracture outside the crack initiation zone was transgranular cleavage. No indication of fatigue was found. The failure was attributed to improper heat treatment during manufacture, which resulted...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.marine.c9001617
EISBN: 978-1-62708-227-3
... in both seawater and air environments. Cracks initiated at an unusually wide variety of sites and propagated in either longitudinal or circumferential directions with respect to the axis of the couplings. Fracture surfaces were intergranular and exhibited little or no sign of corrosion (for couplings...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.pulp.c9001564
EISBN: 978-1-62708-230-3
...). The pipe had developed cracks on the inside surface coincident with an external support gusset. The cracks initiated at wide corrosion grooves. The early stages were corrosion-assisted fatigue cracks. The cracks initiated at the corrosion grooves and propagated as transgranular SCC with characteristic...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0006421
EISBN: 978-1-62708-217-4
... of the crack showed that the fracture faces were corroded. Optical examination of either side of the middle group of fastener holes showed that the area of suspected crack initiation had suffered excessive corrosion. Examination of the holes on the end of the crack showed fracture characteristics typical...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.marine.c9001657
EISBN: 978-1-62708-227-3
... initiation had taken place in the blade trailing edge. An estimate of the crack-growth rate for the stage II fatigue fracture region coupled with the metallographic results helped to identify the final mode of the turbine blade failure. A detailed metallographic and fractographic examination of the air...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001558
EISBN: 978-1-62708-217-4
... aqueous stress-corrosion cracking initiated and propagated the crack which caused failure. The failure analysis approach and its results are described to illustrate how fractography and fracture mechanics, together with a knowledge of the crack initiation and propagation mechanisms of the valve material...