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crack-tip parameters

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Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006910
EISBN: 978-1-62708-395-9
...) Fracture Toughness Measurement 66. Zhabbarov R.M. and Stepanova L.V. , Experimental Evaluation of Coefficients of Multi-Parameter Asymptotic Expansion of the Crack-Tip Stress Field Using Digital Photoelasticity, 1st Virtual European Conference on Fracture . Procedia Structural Integrity...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006926
EISBN: 978-1-62708-395-9
.... For example, the fatigue failure of PC was studied in various liquid environments. It was found that the craze growth rate at the crack tip decreased, and that crack growth and dissolution became more important as the difference between the solubility parameters of the plastic and the solvent approached zero...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001602
EISBN: 978-1-62708-229-7
... The dendritic grain morphology was associated with most of the crack surface ( Fig. 4 and 6 ), with the exception of the extremity of the fracture at the trailing edge, which had an irregular appearance ( Fig. 4 and 7 ). The fracture appeared to have followed a transgranular path in this region. At the tip...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001061
EISBN: 978-1-62708-214-3
.... Cracks had initiated in the weld and HAZ. Fig. 3 The fracture surface was primarily intergranular and was covered with a thin oxide layer. The crack tip had significant sodium compound deposits. Fig. 4 Scanning electron micrograph of the laboratory-induced fracture. Dimples...
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
... be predicted, which requires estimating the magnitude of the relevant crack-tip parameters. Under linear elastic conditions, this parameter is Δ K , the cyclic stress-intensity parameter. However, one must be aware of the limitations of Δ K . These limitations for high-temperature conditions are: the region...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.9781627081801
EISBN: 978-1-62708-180-1
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0006548
EISBN: 978-1-62708-180-1
... opening displacements COV coefficient of variation CPSC Consumer Product Safety Commission CTE coefficient of thermal expansion CTOD crack-tip opening displacement CVD chemical vapor deposition CVN Charpy V-notch (impact test or speci- men) d depth; diameter da/dN fatigue crack growth rate da/dt crack...
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
..., K , derived from LEFM, is the parameter used to describe the magnitude of the stresses, strains, and displacements in the region ahead of the crack tip. This parameter incorporates the boundary conditions of the cracked body and is a function of loading, crack length, and geometry. The stress...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006767
EISBN: 978-1-62708-295-2
... introduces the stress analysis of bodies containing cracklike imperfections and the topic of fracture mechanics. The fracture mechanics approach is based on the analysis of the crack tip stress and strain field. The initial approach proposed by George Irwin, the father of fracture mechanics, used the stress...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001081
EISBN: 978-1-62708-214-3
... finite-element analysis, showing variation of stress-intensity factor with crack lengths. Fig. 12 Grid pattern of microhardness measurements used to determine plastic zone size. Fig. 13 Typical results of microhardness measurements at crack tip of compressor disk bolt hole crack...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006824
EISBN: 978-1-62708-329-4
.... (a) Photograph and schematic showing location of crack at base of fir tree (arrow). (b) Scanning electron fractograph showing intergranular crack path near the crack origin. Original magnification: 240×. (c) Scanning electron fractograph showing creep voids near the crack tip. Original magnification: 2300×. (d...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003530
EISBN: 978-1-62708-180-1
... of fracture mechanics. The fracture mechanics approach is an important part of stress analysis at the tips of sharp cracks or discontinuities. The article reviews fracture mechanics concepts, including linear elastic fracture mechanics, elastic-plastic fracture mechanics, and subcritical fracture mechanics...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001766
EISBN: 978-1-62708-241-9
... crack arrest marking, depicting a zinc coating consistent with the galvanized finish of the anchor Fig. 7 Representative micrograph of the anchor rod microstructure Fig. 9 Residual stress profile in the center member Fig. 10 Contour plot of the crack-tip stress distribution...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003564
EISBN: 978-1-62708-180-1
... mechanics approach to delamination wear of metals. They analyzed a subsurface crack parallel to the surface of a half-plane subjected to a Hertzian surface load. The stress-intensity factors at the crack tips were calculated from an approximate stress field induced by the contact load in a crack-free half...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006934
EISBN: 978-1-62708-395-9
... yielding. Several authors ( Ref 35 – 41 ) have successfully modeled the general craze profile in polymers, such as polyvinyl chloride (PVC), polycarbonate (PC), and PMMA, by examining the crack tip region, based on the Dugdale fracture mechanics analysis in metals ( Fig. 8 ) ( Ref 42 ), which considers...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006940
EISBN: 978-1-62708-395-9
... of the crack tip in both brittle and ductile regimes under fatigue mode in (a) optical, (b) scanning electron, and (c) polarized light. Source: Ref 64 Fig. 8 SEM fractography shows the fatigue-fracture process in a high-density polyethylene sample fatigued at 23 °C (73 °F) and a frequency of 1 Hz...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001836
EISBN: 978-1-62708-241-9
... metal or its alloy to diffuse into the base metal, so that the new crack tip was formed and began to travel and spread, as shown in Fig. 4d , e . However, another theory suggests that since iron oxidizes more easily than copper, the preferential oxidation of iron on the surface causes copper...
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
... the pipe during fabrication. Splits often linked together to form transverse cracks in the wire. Figure 6 , shows crack branching near the tip of a large split. The small crack segments, present at the grain boundaries and between pearlite colonies, were a common feature in most samples. In Figure 7...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003513
EISBN: 978-1-62708-180-1
... Abstract Optimized modeling of fracture-critical structural components and connections requires the application of elastic-plastic fracture mechanics. Such applications, however, can require sophisticated analytical techniques such as crack tip opening displacement (CTOD), failure assessment...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006779
EISBN: 978-1-62708-295-2
... such as a crack, where the tip radius tends to approach zero, far exceeding any recognized limiting levels. Even invoking plasticity still leaves inordinately large values or, conversely, extremely low tolerable loads. The solution is the characterization and quantification of the stress field at the crack tip...