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Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001849
EISBN: 978-1-62708-241-9
... revealed the presence of a characteristic fatigue crack propagation pattern (beach marks) and radial chevron marks indicating the occurrence of final overload through a brittle intergranular fracture. The collected evidence suggests that surface-initiated cracks propagated by fatigue led to spalling...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c0047479
EISBN: 978-1-62708-221-1
...Abstract Abstract A cast dragline bucket tooth failed by fracturing after a short time in service. The tooth was made of medium-carbon low-alloy steel heat treated to a hardness of 555 HRB. The fracture surface was covered with chevron marks. These converged at several sites on the surface...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0047428
EISBN: 978-1-62708-235-8
...Abstract Abstract A cast dragline bucket tooth failed by fracturing after a short time in service. The tooth was made of medium-carbon low-alloy steel heat treated to a hardness of 555 HRB. The fracture surface was covered with chevron marks. These converged at several sites on the surface...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0048164
EISBN: 978-1-62708-217-4
.... It was indicated by chevron marks that brittle fracture had started beneath the brinelled area at the forward edge of the upper surface of the spring. The origin of the brittle fracture was found to be a small fatigue crack that had been present for a considerable period of time before final fracture occurred...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.pulp.c0048804
EISBN: 978-1-62708-230-3
.... Fracture surface were found to exhibit chevron marks typical of fatigue or raised points or tears pointing in the direction of the probable origin of failure. The characteristics of the thinwall cast iron structures like the variation in composition due to pouring from multiple ladles, variation...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.petrol.c9001167
EISBN: 978-1-62708-228-0
... 900°C. The general appearance of the failed coupling is shown in Fig. 1 . The fracture surface was heavily corroded due to its exposure to sea water but nevertheless the directions of crack propagation could be determined from the orientation of the clearly defined chevron markings. These chevron...
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
... differed in thickness, had a sharp taper of 2 to 3 mm on the inner surface. Fig. 1 As-received failed condenser tube Fig. 2 Schematic showing directions of crack propagation, as indicated by chevron marks All fractured surfaces were associated with chevron marks. The directions...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001053
EISBN: 978-1-62708-214-3
... with chevron marks. The chevron marks enabled the propagation direction of each crack to be determined, as indicated by the arrows in Fig. 3 . They point to an origin at the toe of one of the nozzle welds on the inside diameter of the vessel. Figure 4 shows specimen A ( Fig. 3 ), which contained this nozzle...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c0048840
EISBN: 978-1-62708-220-4
... (plates A to D, Fig. 2 ), then branched into the rest of the vessel. All fracture surfaces were classical flat fractures, with no shear lip and chevron markings on all fractures except the fracture immediately at the shroud-support ring. At the ring, the chevron patterns suggested that the crack had...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001055
EISBN: 978-1-62708-214-3
...) techniques, and extract samples for chemical analysis and mechanical testing, the larger failed ring was sectioned into 10 pieces and the matching failed ring was maintained intact for future studies. Macrofractography Classic chevron marks, which are indicative of a fast fracture and usually point...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001537
EISBN: 978-1-62708-234-1
... above and through the flange. The part was loaded so that tensile stresses were imposed normal to the transverse grain above the flange. As shown in Fig. 1 , the fracture surface of the crack contained chevron markings. But when the fracture face was examined by light microscopy, observers could...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.rail.c9001585
EISBN: 978-1-62708-231-0
..., light gray in color, with some orange color; features consistent with overstress fracture with short term exposure to an oxygen-rich environment. Using chevron markings, the fracture origin of this portion of the vertical fracture was traced to an area shown in Fig. 2 . The origin is located...
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
... Circumstances Leading to Failure Pertinent Specifications Specimen Selection Visual examination of the fracture surfaces ( Fig. 2b and c ) showed chevron marks radiating from a common origin. Fracture initiated at a weld made during manufacture to install a handling padeye and propagated through...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001902
EISBN: 978-1-62708-217-4
... “chevronmarking or “herring-bone” pattern, characteristics of brittle fracture, radiating from two tiny fatigue cracks (arrows). Magnification 1.09 times. Fig. 7 Decarburization on the surface of spring leg. Etchant, 2 pct Nital. Magnification 82 times. Selected References Selected...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c0046155
EISBN: 978-1-62708-233-4
..., several beach marks on the fracture surface indicated that various static and dynamic loads had been applied to the structure before final fracture. Chevron marks on the fracture surface showed that the crack propagated toward the bolthole and that the last area to fail was between the bolthole...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001762
EISBN: 978-1-62708-241-9
... in fatigue will be less distinct and smoother than overload fracture. Overload fractures will have chevrons coming to a point and roller bearing marks on the journal. The fractures may or may not have the origins and final fracture aligned due to rotation effects. Single overload failures generally...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c0090988
EISBN: 978-1-62708-236-5
.... The crack center, which was identified as the likely crack origin, is shown after excision in Fig. 1(b) . The surfaces are relatively flat, but exhibit angled shear lips at the inside and outside diameter surfaces. Visible “chevronmarkings pointed back to the origin in the center of the bulged cylinder...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c0047508
EISBN: 978-1-62708-221-1
... in Metals , Failure Analysis and Prevention , Vol 11 , ASM Handbook , ASM International , 2002 , p 587 – 626 10.31399/asm.hb.v11.a0003538 Chevron marks on the fracture surface led to an initiation site on one of the interior corners of the socket portion of the tooth. Examination...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001725
EISBN: 978-1-62708-229-7
.... The apexes of the herringbone markings point to the start of the crack showing this progression through the ring. Fig. 3 Photograph of Fractured Surface. Note indistinct chevron markings in midsection, pointing upward. Dimensions: 1 1 4 in. thick, 1 5 8 in. high The entire...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001844
EISBN: 978-1-62708-241-9
... gear fracture manufacturing defect chromium steel chevron marks needle-like martensite microhardness measurements case depth 30CrMnTi steel (chromium alloy steel) Background Experiments and Methods Observation Results Failure Causes Analysis Conclusions Recommendations...