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ductile crack nucleation

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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
... discussion of both crack nucleation and propagation mechanisms that cause the fracture appearance. Discussions in this article begin with microscale models and mechanisms for deformation and fracture. Macroscale and microscale appearances of ductile and brittle fracture are then discussed for various...
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
... horizontal tail-actuator shafts, bucket elevators, aircraft propellers, helicopter bolts, air flasks, tie rod ball studs, and spiral gears. aircraft landing gears alloy steel corrosion fatigue crack nucleation crankshafts ductile fracture fatigue fracture fractograph grain boundaries hydrogen...
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Published: 01 January 2002
cracks in a soft matrix. (g) Ductile intergranular striations. (h) Particle nucleated ductile intergranular voids. (i) Discontinuous intergranular facets. Source: Ref 31 More
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Published: 15 January 2021
cracks in a soft matrix. (g) Ductile intergranular striations. (h) Particle nucleated ductile intergranular voids. (i) Discontinuous intergranular facets. Source: Ref 8 More
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Published: 01 January 1996
Fig. 4 Schematic of stress-strain curves of brittle and ductile fracture ( G c = critical strain energy rate). (a) Mode I brittle fracture occurs without plastic deformation, except perhaps to a limited degree in the material adjacent to the crack tip. Mode I fracture may propagate More
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Published: 01 January 1987
Fig. 93 Regions of fatigue precracking (at right) and crack extension or fracture (at left) in the fracture surface of a ferritic ductile iron compact tension specimen. Note how crack ignores nodules in fatigue and grows almost exclusively through nodule-nucleated voids during ductile fracture More
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003538
EISBN: 978-1-62708-180-1
... concepts. bending brittle fracture compression failure deformation ductile crack nucleation ductile fracture ductility fractography manufacturing imperfections metals microvoid coalescence notched specimen plastic flow root cause failure analysis single-crystal cleavage models specimen...
Series: ASM Handbook
Volume: 1A
Publisher: ASM International
Published: 31 August 2017
DOI: 10.31399/asm.hb.v01a.a0006323
EISBN: 978-1-62708-179-5
...). An additional fracture mode, very often identified in cast iron failures, is quasi-cleavage. Each fracture mode has a distinctive crack propagation mechanism. Dimple rupture is typical of ductile metals that fail as the result of nucleation, growth, and coalescence of microscopic voids that initiate...
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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. 6 Corrosion tunnel models. (a) Schematic of tunnel model showing the nucleation of a crack by the formation of corrosion tunnels at slip steps and ductile deformation and fracture of the remaining ligaments. (b) Schematic diagram of the tunnel mechanism of SCC and flat-slot formation More
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003537
EISBN: 978-1-62708-180-1
... features of fractures in crystalline materials can be described as either transgranular (TG) or intergranular (IG). Transgranular crack propagation is caused by competing mechanisms of ductile crack nucleation, growth by slip deformation mechanism, and brittle cracking by cleavage. (As described later...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002379
EISBN: 978-1-62708-193-1
... and schematically illustrates the mechanism of crack propagation. The article describes the fracture resistance of high-strength steels, aluminum alloys, titanium alloys, and composites such as brittle matrix-ductile phase composites and metal-matrix composites. It also lists the effects of microstructural...
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 nucleation, small crack lives ( N μ = N MSC + N PSC′ ), and long crack lives ( N p = ; + N LC ) for fatigue ductile and fatigue brittle materials for intermediate fatigue lives For a given arbitrary fatigue life, a material may be loosely categorized as fatigue ductile or fatigue brittle...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003254
EISBN: 978-1-62708-176-4
... matrix composites (i.e., a ductile metal matrix with brittle reinforcement particles). Crack growth in such a material is schematically shown in Fig. 18 . When a crack in the ductile matrix is loaded, the large stresses ahead of the notch promote void nucleation by particle fracture or interface...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006774
EISBN: 978-1-62708-295-2
...). Transgranular crack propagation is caused by competing mechanisms of ductile crack nucleation, growth by slip deformation mechanism, and brittle cracking by cleavage. (As described later in this article, twinning is a TG mechanism of plastic deformation. Deformation twinning provides a limited amount of ductile...
Series: ASM Handbook
Volume: 12
Publisher: ASM International
Published: 01 January 1987
DOI: 10.31399/asm.hb.v12.a0000603
EISBN: 978-1-62708-181-8
... (at right) and crack extension or fracture (at left) in the fracture surface of a ferritic ductile iron compact tension specimen. Note how crack ignores nodules in fatigue and grows almost exclusively through nodule-nucleated voids during ductile fracture. ∼80× (W.L. Bradley, Texas A&M University...
Series: ASM Handbook
Volume: 12
Publisher: ASM International
Published: 01 January 1987
DOI: 10.31399/asm.hb.v12.a0000609
EISBN: 978-1-62708-181-8
... fracture, fracture by overpressurization, inclusion effect, fatigue crack propagation, ductile fatigue striation, secondary cracking, intergranular fracture, and elevated-temperature fracture of alloy steels used in pressure vessels, steam boiler superheater tubes, and box-girder bridges. alloy steel...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002404
EISBN: 978-1-62708-193-1
... in Base Metals The operative cracking mechanism in stainless steel is typically microvoid coalescence, regardless of test temperature. Heat-to-heat variability is associated with differences in both the matrix strength and the density and morphology of inclusions that serve as microvoid nucleation...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005220
EISBN: 978-1-62708-187-0
... fluorescence in the electron beam and its chemical composition are further identifying characteristics. Fig. 2 SEM image of intermetallics (eutectic silicon and β-iron platelets) nucleated and grown on bifilms, causing the bifilms to straighten and create long central cracks. Source: Ref 13...
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
... ductile and brittle cracking mechanisms in the grain boundaries. This distinction, in some cases, may be helpful for appropriate evaluation of cause and corrective action. Mechanisms of IG Fracture On the atomic scale, crack growth occurs by any one or a combination of the following ( Ref 6...