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Stable crack propagation

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c0048535
EISBN: 978-1-62708-218-1
...Abstract Abstract A stick-shift from an automobile transmission failed in service. Failure occurred by stable fatigue crack propagation at locations R and L. Plausibly, the crack initiated at location R due to maximum tensile stress, which was perhaps further concentrated by a surface...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001275
EISBN: 978-1-62708-215-0
... after clamp removal. Clamping damage Mechanical properties Natural gas pipes Plastic pipe Residual stress Stable crack propagation High-density polyethylene Ductile fracture Background Visual Examination of General Physical Features Testing Procedures and Results Discussion...
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
... amounted to about 1% of the static stress. When the ruptured valve body was examined, several crack initiation sites were found along the edge of the fracture within the cut-out area. Figure 2 is a sketch of the slow or stable crack propagation areas of the fracture surface, and adjacent portions...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006777
EISBN: 978-1-62708-295-2
... conditions. (b) High-quality transmission electron microscopy replica showing elongated shear dimples from fatigue region Fig. 8 Fatigue fracture in gas-carburized and modified 4320 steel showing overview of initiation, stable crack propagation, and unstable crack propagation, with extent of stable...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003540
EISBN: 978-1-62708-180-1
... striations Fig. 8 Fatigue fracture in gas-carburized and modified 4320 steel showing overview of initiation, stable crack propagation, and unstable crack propagation, with extent of stable crack indicated by dashed line Abstract Abstract This article briefly reviews the various...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.marine.c9001140
EISBN: 978-1-62708-227-3
... are shown in Fig. 3 , and indicate that the semi - elliptical region A, which is of an intergranular nature, Fig. 3a , was formed as a result of the operation of a stable mechanism, stress-corrosion cracking. The dimpled topography in region B, Fig. 3b , is characteristic of unstable crack propagation...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001515
EISBN: 978-1-62708-229-7
... in shape and location to some previous cracks ( 3 ). Adjacent to the DHC regions were areas of 45° shear (near the outside surface of the tube) and ductile fracture. Fig. 4 Fracture surface of the crack near the coolant outlet end of the Bruce 2 N06 pressure tube. A: penetration, B: stable crack...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c9001656
EISBN: 978-1-62708-219-8
..., to geometric stress raisers. Fig. 5 Fracture surface of reinforcement from beam tested in air. The boundary of region B, the stable crack growth zone, and D, the rupture zone, is not completely concave to A, the stable fatigue crack preferring to propagate across the bar at a greater rate...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.homegoods.c0048536
EISBN: 978-1-62708-222-8
...-causing crack ( Fig. 1a ) suggested that a tensile-stress component was involved in driving failure. Fatigue-crack propagation was evident from the striations visible on the fracture surface. The striated region, almost half the thickness of the roller, reflected stable (subcritical) crack propagation...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001821
EISBN: 978-1-62708-241-9
... applied stress and crack length) at the tip of a slowly growing fatigue crack reaches a critical value, resulting in catastrophic unstable crack propagation. However, structural steel is very soft and deformable in the temperature range of interest, as evidenced by the extensive deformation that preceded...
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
...Abstract Abstract After a quick-release fitting of an ejection seat broke, an investigation was performed to determine the manner and cause of crack propagation. Most fractography-based investigations aim to characterize only qualitative characteristics, such as the fracture orientation...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c9001715
EISBN: 978-1-62708-219-8
... failure process in which sustained tensile stress and chemical attack combine to initiate and propagate fracture in a metal part. 2 The corrosion deposits on the fracture surfaces of the clean specimens (that delineate the stable crack growth regions), the corrosion and linking of inclusions sites...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003546
EISBN: 978-1-62708-180-1
... TMF cracks propagating into the substrate material of a thin-walled blade. Courtesy of Ashok Koul, Life Prediction Technologies, Inc. Fig. 6 Ships's service turbine generator casing showing critical planes A, B, and C on which stresses were determined by finite-element analysis during...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001308
EISBN: 978-1-62708-215-0
.... Because of the increased toughness of the core, the cracks became stable at that size and depth. Applied stresses and additional residual stresses from welding, acting in conjunction with existing residual stresses, caused the crack to propagate across the remaining flange area. The direction of crack...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006781
EISBN: 978-1-62708-295-2
... in Waspaloy from 25 to 800 C , Mater. Sci. Eng. , Vol 66 ( No. 2 ), 1984 , p 151 – 166 10.1016/0025-5416(84)90177-0 14. Diederich D. , Lerch B. , and Antolovich S.D. , Observations of Low Cycle Fatigue and Fatigue Crack Propagation Substructures in Waspaloy , Eighth Inter...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003539
EISBN: 978-1-62708-180-1
... examination. Fig. 2 Close-up view of ratchet marks between distinct surface origin sites in a low-alloy steel 18.4 cm (7.25 in.) shaft that failed in rotating bending fatigue. Ratchet marks (at arrows) are roughly radial steps formed where fatigue cracks initially propagating on different planes...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c9001570
EISBN: 978-1-62708-220-4
... the exchanger tubes to impose load on seal welds and the shell side cooling water entered the crevice between the tubesheet and the tubes. The cooling water in the crevice caused galvanic reaction and embrittlement of seal welds. Brittle crack opening and crack propagation in seal welds occurred due...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001761
EISBN: 978-1-62708-241-9
... of failure of the crankshaft. The partial absence of the nitrided layer in the fillet region, due to over-grinding, caused a decrease in the fatigue strength which, in turn, led to crack initiation and propagation, and eventually premature fracture. Signs of crankshaft misalignment during installation were...
Book Chapter

Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003541
EISBN: 978-1-62708-180-1
...-density polyethylene pipe. Arrows indicate the direction of crack propagation. Fig. 28 Fracture band width as a function of crack length for the polyethylene pipe shown in Fig. 27 Fig. 15 Typical load-displacement curve for a ductile polymer tested in uniaxial tension Fig. 16...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006775
EISBN: 978-1-62708-295-2
...Abstract Abstract This article focuses on characterizing the fracture-surface appearance at the microscale and contains some discussion on both crack nucleation and propagation mechanisms that cause the fracture appearance. It begins with a discussion on microscale models and mechanisms...