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fatigue crack nucleation

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Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002355
EISBN: 978-1-62708-193-1
... Abstract This article presents an overview of fatigue crack nucleation from the point of view of the material microstructure and its evolution during cycling. It describes the sites of microcrack nucleation at the free surfaces. The article discusses the relation of dislocation structures...
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Published: 01 June 2016
Fig. 22 Fatigue crack nucleation sites in Ti-6Al-4V alpha-beta alloy. (a) Fully lamellar microstructure. (b) Fully equiaxed microstructure. (c) Duplex microstructure More
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Published: 01 January 1996
Fig. 10 Fatigue crack nucleation sites in Ti-6Al-4V. (a) Fully lamellar microstructure. (b) Fully equiaxed microstructure. (c) Duplex microstructure. Source: Ref 13 More
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Published: 01 January 1996
Fig. 17 Fatigue crack nucleation in conventionally aged Ti-3Al-8V-6Cr-4Mo-4Zr. Source: Ref 24 More
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Published: 01 January 1996
Fig. 22 Fatigue crack nucleation sites in Ti-10V-2Fe-3Al. α p , primary alpha phase. Source: Ref 31 More
Series: ASM Handbook
Volume: 12
Publisher: ASM International
Published: 01 January 1987
DOI: 10.31399/asm.hb.v12.a0000610
EISBN: 978-1-62708-181-8
... candy fracture, cleavage fracture, brittle fracture, high-cycle fatigue fracture, fatigue striations, hydrogen-embrittlement failure, creep crack propagation, fatigue crack nucleation, intergranular creep fracture, torsional overload fracture, stress-corrosion cracking, and grain-boundary damage...
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Published: 31 December 2017
deformation, the deformed surface can fracture to yield wear debris; (c) fatigue, where sliding causes zones of compression and tension in the subsurface of the material, and fatigue cracks nucleate between the zones and propagate with repeated sliding; (d) corrosion, where a reaction layer forms More
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005405
EISBN: 978-1-62708-196-2
... of monitoring via an inspection scheme. This article begins with a discussion on the stages of the fatigue damage process. It describes hierarchical multistage fatigue modeling and several key points regarding the physics of crack nucleation and microstructurally small crack propagation in the HCF regime...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002367
EISBN: 978-1-62708-193-1
... favor long crack growth and the conditions, which favor crack nucleation are contrasted. The article presents experimental data, which is used to show the effect of weldment geometry on fatigue resistance. Several useful geometry classification systems are compared. The article analyzes a computer model...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003316
EISBN: 978-1-62708-176-4
..., although wear will change the assumed contact geometry. A general treatment of the subject can be found in Ref 3 . Fatigue-Crack Nucleation from Fretting Crack nucleation due to fretting must involve a stress concentration or discontinuity. At the microscopic level, examples include: microcracks...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002372
EISBN: 978-1-62708-193-1
... geometry. A general treatment of the subject can be found in Ref 3 . Fatigue Crack Nucleation from Fretting Crack nucleation due to fretting must involve a stress concentration or discontinuity. At the microscopic level, examples include: microcracks formed at the base of asperities due to reverse...
Series: ASM Handbook
Volume: 12
Publisher: ASM International
Published: 01 January 1987
DOI: 10.31399/asm.hb.v12.a0000608
EISBN: 978-1-62708-181-8
..., impact fracture, fatigue fracture surface, reversed torsional fatigue fracture, transgranular cleavage fracture, rotating bending fatigue, tension-overload fracture, torsion-overload fracture, slip band crack, crack growth and crack initiation, crack nucleation, microstructure, hydrogen embrittlement...
Series: ASM Handbook
Volume: 13C
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v13c.a0004128
EISBN: 978-1-62708-184-9
... to predict fatigue life, which consists of a crack initiation period (including crack nucleation and microcrack growth) and a crack growth period (covering the growth of a visible crack to failure) ( Ref 8 ). The development and validation of corrosion metrics that can be used as inputs into analytical...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002409
EISBN: 978-1-62708-193-1
... Abstract This article summarizes the metallurgical and environmental variables that affect fracture toughness, fatigue life, and subcritical crack growth of titanium alloys, such as chemistry, microstructure, texture, environment, and loading. The classes of titanium alloys considered...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002348
EISBN: 978-1-62708-193-1
... Abstract This article provides ASTM standard definitions for fatigue and describes the approaches that are used to design finite or infinite life, used in a complementary sense in fatigue design. It explains four distinct phases of fatigue: nucleation, structurally dependent crack propagation...
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Published: 01 January 2000
Fig. 13 Optical micrographs showing the nucleation and growth of a mode I fatigue crack in the plane of the notch as a result of cyclic compression loading in HIPS. (a) Crazing before fatigue cycling. (b) Nucleation of fatigue crack after 15,000 cycles. (c) Crack growth after 20,000 cycles. (d More
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003313
EISBN: 978-1-62708-176-4
... better understanding and simulation of both crack nucleation and the subsequent crack growth mechanisms. This article reviews three basic types of fatigue properties: stress-life, strain life, and fracture mechanic crack growth. crack initiation crack nucleation crack propagation fatigue...
Book Chapter

Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003544
EISBN: 978-1-62708-180-1
... magnitude. The crack propagates under the applied stress through the material until complete fracture results. On the microscopic scale, the most important feature of the fatigue process is the nucleation of one or more cracks under the influence of reversed stresses that exceed the flow stress locally...
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Published: 01 December 2009
Fig. 2 (a) Crosshatched regime for typical ratios of N nucl / N t as a function of total fatigue life. (b) Schematic showing relative ratios of nucleation, small crack lives ( N μ = N MSC + N PSC′ ), and long crack lives ( N p = ; + N LC ) for fatigue ductile and fatigue brittle More
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Published: 01 January 1996
Fig. 1 Metallic fatigue. The stages of fatigue include cyclic slip (crack nucleation) and stage I and stage II crack growth. More