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microstructurally small crack propagation

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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.a0002366
EISBN: 978-1-62708-193-1
... that the propagation behavior of microstructurally small and physically small cracks depends significantly on both the R -ratio and stress amplitude, in addition to stress state. Small crack behavior is subject to more scatter due to greater dependence on microstructure. There are several prevalent explanations...
Image
Published: 01 December 2009
Fig. 3 Heuristic multistage modeling framework for nucleation and growth of fatigue cracks. Cycles N MSC and N PSC , respectively, represent the number of cycles to propagate the crack(s) in the regimes of microstructurally small crack (MSC) growth (normally 3–10 times the grain or second More
Image
Published: 01 December 2009
Fig. 8 Hierarchical thresholds for propagating cracks in a plot of completely reversed applied stress amplitude versus maximum inclusion size (thresholds for nucleation not shown). MSC, microstructurally small crack; PSC, physically small crack; LEFM, linear elastic fracture mechanics More
Series: ASM Handbook Archive
Volume: 12
Publisher: ASM International
Published: 01 January 1987
DOI: 10.31399/asm.hb.v12.a0000602
EISBN: 978-1-62708-181-8
... propagation of gray irons. ductility fatigue fracture fractograph graphite gray iron microstructure Fig. 29 Fatigue fracture of sand-cast gray iron bread-crumb grinder. The ASTM A159 part was machined and hot dip galvanized after casting. Also, a lockpin hole (not visible) was drilled...
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
... ) is reached, the shear lips have very small width. The local state of stress created by a load on a component geometry may cause crack propagation (i.e., critical fracture) that results in a fracture surface with a macroscale appearance; that is: Totally ductile Totally brittle Initially...
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
... to the outside of the specimen, decreasing the widths of the shear lips. When the minimum value of plane-strain toughness ( K Ic ) is reached, the shear lips have very small width. The local state of stress created by a load on a component geometry may cause crack propagation (i.e., critical fracture...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002357
EISBN: 978-1-62708-193-1
... is in the next article “Behavior of Small Fatigue Cracks” in this Volume. Comprehensive Review of Threshold Data A comprehensive review of threshold data has been provided by Taylor ( Ref 22 ). Liaw ( Ref 23 ) reviewed the effects of microstructure, environment, loading condition, and crack size on near...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002359
EISBN: 978-1-62708-193-1
... had a layered microstructure. As a result, propagation was difficult normal to these grain layers into the specimen, relative to that in the surface direction. The shallow crack shape also reflects this difficulty, indicating that it is easier for the crack to grow in the surface direction than...
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
... are similar for all alloys, the higher levels of interstitials leading to faster fatigue crack propagation and lower K Ic . A similar trend is observed for variations in microstructure. Those microstructures (Widmanstätten or recrystallization annealed) that give the highest K Ic values generally yield...
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
... this, several small parallel planes form on the new grain and grow. When twisting is needed, different planes are joined by tear facets. As growth proceeds, the multiple cracks tend to converge to a single surface. Thus, the direction of crack propagation can be inferred from the river patterns. This concept...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002353
EISBN: 978-1-62708-193-1
... or parts is well known. This is true for cycles to failure, cycles to crack initiation, microcrack propagation rate, and macrocrack propagation rate. A fatigue database should include this variability, as well as a clear description of the specimen or part geometry, surface finish, microstructure...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003226
EISBN: 978-1-62708-199-3
... and conditions leading to fracture. Fracture Changes During Crack Propagation Several influences may affect the growth of a crack, causing it to progress thereafter by a mechanism of fracture different from that in effect when cracking started. These influences include local differences in microstructure...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003227
EISBN: 978-1-62708-199-3
... and electron microprobe analysis. fractured parts or performing failure analysis. or has small discontinuities. Study of the fracture surface will reveal Crack Origin and Crack-Propagation Path. The orientation of the principal applied stress whether discontinuities from processing led to cannot always...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002352
EISBN: 978-1-62708-193-1
... microstructures and small grain size increase creep rates Ruptures occur after long exposure times Verify proper alloy (a) Fractographers often refer to “overload fracture” as a way to distinguish the failure from fatigue or stress-corrosion crack growth. However, a true overload failure is rare...
Series: ASM Handbook
Volume: 2B
Publisher: ASM International
Published: 15 June 2019
DOI: 10.31399/asm.hb.v02b.a0006549
EISBN: 978-1-62708-210-5
... discusses various models of fatigue crack growth (FCG) and the effects of alloy microstructure and composition on FCG. aluminum alloys cyclic fatigue fatigue crack growth microstructure precipitate-free zones shearable precipitates strain-control fatigue testing FATIGUE is the progressive...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003720
EISBN: 978-1-62708-177-1
... lips have very small width. Source: Ref 9 Surface roughness and optical reflectivity also provide qualitative clues to events associated with crack propagation. For example, a dull/matte surface indicates microscale ductile fracture, while a shiny, highly reflective surface indicates brittle...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002358
EISBN: 978-1-62708-193-1
... growth may be different due to the effects of localized plasticity, crack closure, microstructural influences on crack-tip strain, or localized crack-tip chemistry. In some cases, the basic continuum mechanics assumptions of material homogeneity and small-scale yielding may be violated for small-crack...
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
...: Ref 6 Small-Crack Behavior Small-crack behavior is a complex subject, due to the variety of factors that may affect small cracks and the variety of microstructures used in engineering structures. In contrast to large-crack growth rates, which generally increase with increasing Δ K , small...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002410
EISBN: 978-1-62708-193-1
... are summarized. The article also discusses the effects of microstructure and extrinsic parameters on fatigue crack propagation (FCP). It details the modeling of FCP rates and creep and creep-fatigue crack growth rates. creep creep-fatigue crack growth rate fatigue fatigue crack propagation fracture...