Quantification of fastener hole quality

Rudd, JL; Gray, TD

doi:10.2514/6.1977-382

Cited by 16 publications

(19 citation statements)

References 1 publication

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“…45 This initial quality can be characterized in terms of a Weibull distribution of equivalent crack sizes with a scale parameter of 0.0012 inch (0.03 mm) and a shape parameter of 0.77. Crack growth for very small crack sizes was modeled by back exponential extrapolation from fracture mechanics based crack growth which began at 0.0051 inch (0.13 mm).…”

Section: Figure 88 Crack Growth Life Curves For Critical Location Atmentioning

confidence: 99%

Effect of Preexisting Corrosion on Fatigue Cracking of Aluminum Alloys 2024-T3 and 7075-T6

Koch¹,

Hagerdorn²,

Berens³

1995

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Section: Figure 88 Crack Growth Life Curves For Critical Location Atmentioning

confidence: 99%

Effect of Preexisting Corrosion on Fatigue Cracking of Aluminum Alloys 2024-T3 and 7075-T6

Koch¹,

Hagerdorn²,

Berens³

1995

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“…The concept of Equivalent Initial Flaw Size (EIFS) was introduced after the works of Rudd and Gray (1977). The motivation for such approach was the conclusion that the application of NDT methods for obtaining statistical distributions of flaw sizes was a time consuming and sometimes non-reliable approach.…”

Section: Summary Of the Eifs Methodologymentioning

confidence: 99%

Towards a methodology for the practical applications of the EIFS (Equivalent Initial Flaw Size) concept

Mattos

Chaves

2013

Lat. Am. j. solids struct.

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This work intends to introduce a probabilistic approach for the crack propagation analysis. It presents a methodology that is based on the distribution of the initial flaw size a 0 . Departing from fatigue test results for specific structural components, an estimation of the initial flaw distribution is obtained, and from this distribution it becomes possible to establish the appropriate initial flaw size for crack propagation analysis for the chosen statistical distribution, such as Weibull or Log-normal. The methodology allows to apply different values of a 0 for different components or structural details, reflecting the quality of the manufacturing process for the item evaluated. Two examples of practical applications of the EIFS concept are presented, corresponding to lugs and shear joints usually used for aerospace applications.

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“…The approach taken here is based on a Defence Science and Technology Organisation (DSTO) review of the effect of corrosion on structural integrity published in 1997 1 . This review suggested using the equivalent initial flaw size (EIFS) approach 14 to manage the effect of corrosion on structural integrity. It was noted that Paul and Groner 15 and Bucci et al 16 had previously advocated such an approach to the United States Air Force.…”

Section: Introductionmentioning

confidence: 99%

The EIFS distribution for anodized and pre‐corroded 7010‐T7651 under constant amplitude loading

Crawford

Loader

Ward

et al. 2005

Fatigue Fract Eng Mat Struct

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A B S T R A C T This paper reports results from SICAS, an experimental programme to evaluate the effectiveness of the equivalent initial flaw size (EIFS) approach in managing the structural integrity effects of pitting corrosion. Fatigue crack growth and life tests were conducted on anodized and pre-corroded 7010-T7651. The corrosion pits that initiated fatigue were then measured using the SEM. These data were analysed statistically to identify the pit geometric parameter(s) that influenced fatigue life. Projected pit area had the strongest effect, while pit depth and pit width were each statistically insignificant. The EIFS distribution for corroded 7010-T7651 was then calculated. Examination of the probability distribution of the ratio of EIFS area to pit area allowed the derivation of a scatter factor that gave safely conservative fatigue life predictions for the corroded material. N O M E N C L A T U R E C m = coefficients of multiple linear regression, m = 1, 2, . . . , m n = Paris Law exponent N = number of cases (coupons) R = load ratio, σ min /σ max K = stress intensity factor, MPa √ m ρ = Spearman's correlation coefficient σ max = maximum stress, MPa σ min = minimum stress, MPa

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Quantification of fastener hole quality

Cited by 16 publications

References 1 publication

Effect of Preexisting Corrosion on Fatigue Cracking of Aluminum Alloys 2024-T3 and 7075-T6

Effect of Preexisting Corrosion on Fatigue Cracking of Aluminum Alloys 2024-T3 and 7075-T6

Towards a methodology for the practical applications of the EIFS (Equivalent Initial Flaw Size) concept

The EIFS distribution for anodized and pre‐corroded 7010‐T7651 under constant amplitude loading

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