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variable-amplitude fatigue crack initiation

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Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002398
EISBN: 978-1-62708-193-1
...; plane-stress fracture toughness; plane-strain fracture toughness; constant-amplitude fatigue crack initiation and growth; and variable-amplitude fatigue crack initiation and growth. References 1. Steel Castings Handbook , 6th ed. , Steel Founders' Society of America and ASM International...
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
... fatigue crack initiation are surface contact stress, slip amplitude, and coefficient of friction. All other variables are secondary and affect fretting and fretting fatigue through their influence on the primary variables. Unfortunately, much contradictory data appear in the literature ( Ref 17...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002356
EISBN: 978-1-62708-193-1
... of the amplitude block sequence on the fatigue life in program fatigue tests. (a) Tests on edge-notched Al alloy specimens. K t = 4. (b) Block sequence in one period. Source: Ref 24 Fig. 29 Effect of the truncation level ( S a,max ) on the crack initiation period (until a = 2 mm) and the crack...
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
... that control fatigue-crack initiation are surface contact stress, slip amplitude, and coefficient of friction. All other variables are secondary and affect fretting and fretting fatigue through their influence on the primary variables. Unfortunately, many contradictory data appear in the literature ( Ref 17...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002350
EISBN: 978-1-62708-193-1
... of R value. (a) Stress amplitude vs. N. (b) Maximum stress vs. N Fig. 3 A plot of reduction factor for use in estimating the effect of surface finish on the S - N fatigue limit of steel parts. Source: Ref 17 Fig. 4 A synthetically generated Haigh diagram based on typically...
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
... Abstract The separation of the fatigue process into crack initiation and propagation phases has been an important and useful advance in engineering. The combined approach of strain-control testing and the development fracture mechanics of fatigue crack growth rates is a key advance that allows...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003668
EISBN: 978-1-62708-182-5
... stress-intensity range (Δ K ). See the text for an explanation of the variables. Source: Ref 45 Fig. 10 Crack tip stress-intensity control of fatigue crack propagation in 7075-T6 aluminum alloy sheet—long-transverse loading. Remote and wedge force methods of loading specimens in aqueous 3.5...
Series: ASM Handbook
Volume: 20
Publisher: ASM International
Published: 01 January 1997
DOI: 10.31399/asm.hb.v20.a0002469
EISBN: 978-1-62708-194-8
...-to-failure curves Fig. 23 Schematic showing how the life to crack initiation for notched members can be determined. (a) Strain approach. (b) Stress approach. Source: Ref 48 Fig. 20 Transition from low-cycle fatigue to high-cycle fatigue for carbon steel plate. Source: Ref 44...
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
... ). Variations were more significant in terms of stress concentrations such as notches ( Fig. 1 ) or environmental conditions ( Fig. 2 ). Fatigue strengths for unnotched specimens were observed to have greater spread than for notched specimens, thus suggesting accelerated crack propagation after crack initiation...
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
.... It is implied in this defect-tolerant approach that all structural components are intrinsically flawed with an initial crack size, a i . Assuming the fatigue loading is performed under constant stress amplitude conditions, the geometric factor, f (α), does not change within the limits of integration...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002362
EISBN: 978-1-62708-193-1
...-amplitude loading) Load interactions in variable-amplitude loading State of stress Residual stress Crack size and shape, and their relation to component size and geometry Fig. 4 General interrelationships associated with environmentally assisted cracking, which can encompass crack growth rates...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003314
EISBN: 978-1-62708-176-4
... examines specimen design and preparation as well as the apparatus used in crack initiation testing. Variables that influence the resistance of alloys to fatigue crack initiation, such as the effect of mean and residual stress, stress concentrations, stress amplitude, and surface properties, are briefly...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002365
EISBN: 978-1-62708-193-1
... of the fatigue notch factor with life. The S - N data in (a) are used to obtain k ′ f = σ a / S a in (b). The notches are half-circular cutouts. Source: Ref 1 (p 409) Fig. 6 Use of the Palmgren-Miner rule for life prediction for variable amplitude loading that is completely reversed. Source...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003631
EISBN: 978-1-62708-182-5
.... 15 Fretting scar on fatigued steel specimen showing location of fatigue crack (arrow). Source: Ref 18 Fig. 16 Section through a bar of aged Al-4Cu alloy showing a crack initiated by fretting fatigue. Courtesy of R.B. Waterhouse, University of Nottingham Fig. 17 Section showing...
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
.... The article provides a description of the microstructure-sensitive modeling to model fatigue of several classes of advanced engineering alloys. It describes the various modeling and design processes designed against fatigue crack initiation. The article concludes with a discussion on the challenges...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0009219
EISBN: 978-1-62708-176-4
... = 6.8948 MPa For strain-control fatigue data, strain amplitude is plotted versus cycles-to-failure (or cycles-to-crack-initiation, determined by a specific criterion) on a log-log scale ( Fig. 3 ). As with S / N data, curves sometimes are constructed for different mean strains or strain ratios...
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
... criteria (crack initiation, change of stiffness, fracture) Shape of spectrum for variable-amplitude loading Handling and representation of runouts Determination of fatigue limit (pearl chain, staircase, probit) Statistical evaluation and quantification of scatter An example of what should...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0009217
EISBN: 978-1-62708-176-4
... Aircraft Structures,” AFWAL-TR-82-3073, Air Force Wright Aeronautical Laboratories , Wright-Patterson Air Force Base, OH , Oct 1982 19. Barsom J.M. , Fatigue Crack Growth Under Variable Amplitude Loading in ASTM A514-B Steel , in Progress in Flaw Growth and Fracture Toughness Testing...
Series: ASM Handbook
Volume: 1
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v01.a0001038
EISBN: 978-1-62708-161-0
... Abstract The process of fatigue failure consists of three stages: initial fatigue damage leading to crack initiation; crack propagation to some critical size; and final, sudden fracture of the remaining cross section. Variations in mechanical properties, composition, microstructure...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002406
EISBN: 978-1-62708-193-1
... from the disciplines of strain control fatigue and fracture mechanics. The strain control approach is aimed primarily at fatigue crack initiation and early fatigue crack growth, while fracture mechanics concepts address the propagation of an existing crack to failure. This combination of knowledge from...