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stable crack propagation

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Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002400
EISBN: 978-1-62708-193-1
... in carburized steels. The stages of fatigue and fracture of the steels, namely crack initiation, stable crack propagation, and unstable crack propagation, are reviewed. The article analyzes the intergranular fracture at the prior-austenite grain boundaries of high-carbon case microstructures that dominates...
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Published: 01 January 1996
Fig. 8 Fatigue fracture in gas-carburized and modified 4320 steel. (a) Overview of initiation, stable crack propagation, and unstable crack propagation. (b) Same area as shown in (a), but with extent of stable crack indicated by dashed line. (c) Higher magnification of intergranular initiation More
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Published: 15 January 2021
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 More
Image
Published: 01 January 2002
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 More
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003312
EISBN: 978-1-62708-176-4
... is required. Instead, the crack initiates at the tip of the chevron during testing. The crack then propagates through the chevron in a stable manner because the chevron presents an ever-widening crack front to the propagating crack. Examination of the loading curves provides an indication of stable fracture...
Image
Published: 15 May 2022
be great enough for long cracks to be able to propagate. The second region, represented by the solid middle line, is the Paris regime, where stable crack growth occurs. Finally, the third region, represented by the dashed line to the right, is the unstable crack-growth regime dictated by fast fracture More
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Published: 31 August 2017
Fig. 38 Schematic illustration of the different regimes of stable fatigue crack propagation. Source: Ref 62 More
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Published: 01 January 1996
Fig. 1 Schematic illustration of the different regimes of stable fatigue crack propagation. Source: Ref 1 More
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003311
EISBN: 978-1-62708-176-4
... mechanics tests. It is loaded in tension, but the primary stress is due to bending because the load line is offset from the crack front ( Fig. 7b ). Relatively stable crack propagation is possible with the CT specimen if a stiff testing machine is used. Also, a variant of the CT can be used in a wedge...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003635
EISBN: 978-1-62708-182-5
... implies the occurrence of unstable crack propagation; that is, once a crack is initiated, it propagates to failure in the presence or absence of the liquid metal at the crack tip. In propagation-controlled failure, stable crack propagation occurs such that microcracks are formed at some low stress...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002417
EISBN: 978-1-62708-193-1
... refers to stable crack propagation under sustained loads in the presence of an embrittling environment (which is commonly known as stress-corrosion crack growth in the metallurgy and engineering literature). The expression cyclic fatigue is used in the ceramics community to describe cyclic load...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006918
EISBN: 978-1-62708-395-9
... by the dashed line to the left. This is the threshold and near-threshold growth region. Crack driving forces must be great enough for long cracks to be able to propagate. The second region, represented by the solid middle line, is the Paris regime, where stable crack growth occurs. Finally, the third region...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003058
EISBN: 978-1-62708-200-6
... of crack branching, one of the deviations becomes large enough to nucleate a second crack, which begins to propagate in a stable fashion. In a qualitative sense, the formation of the instability is clearly associated with high crack velocity that accompanies a higher stress intensity. It has been suggested...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003318
EISBN: 978-1-62708-176-4
... are intrinsically flawed and capable of sustaining a considerable amount of stable crack growth before failure. The fatigue life of a component based on this defect-tolerant approach is dictated by the number of loading cycles needed to propagate a crack of an initial size to a critical dimension. Fracture...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003633
EISBN: 978-1-62708-182-5
... of SCC. It describes the phenomenological and mechanistic aspects of the initiation and propagation of SCC. The article includes a phenomenological description of crack initiation and propagation that describes well-established experimental evidence and observations of stress corrosion. Discussions...
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
... . The transition from the transgranular fracture of the stable crack to the largely IG fracture of the unstable fracture is identified by the dashed line in Fig. 8 . Fig. 8 Fatigue fracture in gas-carburized and modified 4320 steel showing overview of initiation, stable crack propagation, and unstable...
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
... of design, testing, and failure analysis, this fatigue process can be conveniently divided into three parts: Crack initiation Stable progressive crack propagation Final (fast) fracture Design and testing aspects of fatigue are discussed in more detail elsewhere, such as in Fatigue...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002393
EISBN: 978-1-62708-193-1
.... The crack had originated at rivet holes of a reinforcing plate near the external rib of an engine, and it had propagated undetected because of the lack of adequate inspections based on engineering evaluation (i.e., damage tolerance). The aircraft had accumulated 25,760 h. Another important incident...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003310
EISBN: 978-1-62708-176-4
... for crack propagation. Hence, in any mechanical test the energy measured to propagate a crack consists of the surface energy of the crack, energy of plastic deformation at the crack tip, and energy of inelastic deformation of the entire specimen ( Ref 3 ). Because the latter two forms of energy absorption...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003142
EISBN: 978-1-62708-199-3
... Abstract This article discusses corrosion resistance of titanium and titanium alloys to different types of corrosion, including galvanic corrosion, crevice corrosion, stress-corrosion cracking (SCC), erosion-corrosion, cavitation, hot salt corrosion, accelerated crack propagation, and solid...