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Fatigue striations

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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.c9001764
EISBN: 978-1-62708-241-9
.... All of the failures, a total of 14, were of the same type of design, which according to finite-element analysis, produces a significantly higher level of stress. SEM examination of the fracture surface of one of the failed drive shafts revealed fatigue striations near the OD and ductile dimpling near...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001822
EISBN: 978-1-62708-241-9
... of fatigue striations all supported transit fatigue as the damage mechanism. spiral welded pipe fracture transit fatigue HSLA steel longitudinal crack magnetic particle testing cyclic hoop stress API 5L-X65 (high-strength low-alloy plate steel) A newly installed...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001052
EISBN: 978-1-62708-214-3
... followed a multidirectional/circular pattern, occasionally chipping off the convolutions, an indication of high-resonance fatigue-type cracking. Scanning electron fractography showed fatigue striations throughout the fracture surface. The microstructure consisted of relatively large grains and an abnormal...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c0047234
EISBN: 978-1-62708-233-4
... fracture-initiation area showed fatigue striations. No casting or metallurgical structural defects were found that could explain the failures. This evidence supports the conclusion that cracking was a result of the stress-concentration site at the bolt holes where a fatigue-initiated fracture occurred...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001350
EISBN: 978-1-62708-215-0
.... Surface examination showed ratchet marks at the edges of the fracture surface, indicating that loading was of the rotating bending type. Electron fractography using the two-stage replica method revealed striation marks characteristic of fatigue fracture. The striations indicated that the cracks had...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001360
EISBN: 978-1-62708-215-0
.... 3 , left) appeared to follow an irregular path and was sheared at 45° to the plane of the blade. Fig. 3 Smaller portion of fractured blade, showing fatigue crack origin near a rivet hole. 0.7× Examination by scanning electron microscopy (SEM) revealed fatigue striations on the flat...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001110
EISBN: 978-1-62708-214-3
... fractograph from the area indicated by the arrow in Fig. 3 , showing coarse fatigue striations and secondary cracks. 1260×. Fig. 5 SEM fractograph from a longitudinal fracture surface. Note the smoother fracture surface than in Fig. 3 . 315×. Fig. 6 SEM fractograph from the area...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001361
EISBN: 978-1-62708-215-0
... with a scanning electron microscope (SEM). The smooth “oyster shell” areas ( Fig. 5a ) on the fracture surface displayed faint fatigue striations throughout, some of which are shown in Fig. 5(b) . The surface was also found to contain secondary cracks between some of the nonmetallic inclusions ( Fig...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001388
EISBN: 978-1-62708-215-0
... (22 ksi), which exceeded the fatigue limit of the bolts (about 50 MPa, or 7 ksi), as shown in Fig. 10 . Table 1 Stress range estimated from striation spacing on a failed bolt Crack depth ( a ) Striation spacing ( S ) Stress-intensity factor range (ΔK) Total stress range (Δσ m...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001298
EISBN: 978-1-62708-215-0
... micrograph of the spar fracture surface and shows uniformly spaced fatigue striations. Fig. 4 Scanning electron micrograph of fatigue striations on tail rotor blade spar fracture surface. Approximately 3534× Though corrosion pitting was present, there was an absence of significant amounts of...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001095
EISBN: 978-1-62708-214-3
... that grow under the action of the fluctuating stress.” A bolted joint that is properly designed and assembled will not suffer from fatigue damage unless the cyclic separating force exceeds the clamping force of the bolts. In the event that complete fracture occurs, fatigue striations are sometimes seen...
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
.... Table 4 Classification of bolt hole crack initiation sites No. Initiation % of total cracks 1 Single 11.3 2 Corner 20.4 3 Multiple 69.9 Fatigue striation spacings were measured on the fracture surfaces of nine cracks ranging in length from 4 to 19 mm (0. 16 to 0.75 in...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001025
EISBN: 978-1-62708-214-3
... fracture mechanics, the critical crack size measured on the fractured wheel, and published fracture toughness data for 2014-T6, a maximum tensile stress of 30 MPa (4.5 ksi) was estimated for the wheel at the time of fracture. To verify this stress level, fatigue striation spacings on the fracture surface...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001346
EISBN: 978-1-62708-215-0
... and 3), and there was carbide precipitation at the grain boundaries. All these features are consistent with high-temperature operating conditions. Moreover, the presence of striations on the fracture surface ( Fig. 4 ) clearly indicates that fatigue was involved, and that cracking was from both sides...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001028
EISBN: 978-1-62708-214-3
... through the thickness that was wider at the bottom edge of the top sheet (near the weld root). Detailed examination of the fracture surface near this center radial crack showed a small zone of fatigue striations, indicating that this upper crack zone originated on the top surface of the sheet ( Fig. 6...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001098
EISBN: 978-1-62708-214-3
... fractographic features such as fatigue striations were not observed, but this is not unusual for a fatigue fracture in martensitic steels. The beach marks and the location of the origin relative to the final fracture area were indicative of unidirectional, bending fatigue. The multiple origin sites indicated a...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001075
EISBN: 978-1-62708-214-3
... pointed to the origin of the fatigue fracture. The fatigue fracture surface is shown at high magnification in Fig. 4 . No fatigue striations were observed, but they may have been masked by corrosion products formed on the fracture surface. Figure 5 shows the final overload fracture surface, which...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001033
EISBN: 978-1-62708-214-3
.... (c) Severe damage at top screen. Cracking is shown at the saddle points in Fig. 7(a) . Evidence of interrupted crack growth is shown in Fig. 7(b) by the parallel features observed on the fracture surface. Higher magnification revealed fatigue striations on the fracture surface ( Fig. 7c...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001594
EISBN: 978-1-62708-229-7
... crack fronts, very faint, fine fatigue striations, Stage I feathering or river tributary markings, and considerable burnishing of the fracture. For fractures resulting from a low-cycle condition, such as equipment startup and shutdown, the same features may be noted, but the striations are...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001297
EISBN: 978-1-62708-215-0
... shows multiple pits at origin with associated corrosion product. Beach marks are shown emanating from pits, typical of a fatigue failure mode. Approximately 63×. Fractographic analysis by scanning electron microscopy revealed fatigue striations with varying spacings, caused by the complex load...