On the growth of cracks from etch pits and the scatter associated with them under a miniTWIST spectrum

D. Tamboli; S. Barter; R. Jones

doi:10.1016/j.ijfatigue.2017.12.002

On the growth of cracks from etch pits and the scatter associated with them under a miniTWIST spectrum

D. Tamboli, S. Barter, R. Jones

Mechanical & Aerospace Engineering

Research output: Contribution to journal › Article › Research › peer-review

18 Citations (Scopus)

Abstract

This paper examines the growth of cracks from small naturally occurring discontinuities in AA7050-T7451 coupons tested under a miniTWIST load spectrum. A markerband is inserted in the spectrum to aid in Quantitative Fractography. The resulting crack growth curve is reasonably exponential in nature, which indicates that crack growth under combat aircraft spectra and civil aircraft transport spectra is similar. It is also shown that the Hartman-Schijve crack growth equation can be used to compute the crack growth histories and account for the scatter seen in the various tests by allowing for small changes in the value of ΔK_thr.

Original language	English
Pages (from-to)	10-16
Number of pages	7
Journal	International Journal of Fatigue
Volume	109
DOIs	https://doi.org/10.1016/j.ijfatigue.2017.12.002
Publication status	Published - 1 Apr 2018

Keywords

Aircraft sustainment
Etch pits
Fatigue crack growth
Fatigue variability
Lead cracks

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10.1016/j.ijfatigue.2017.12.002

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abstract = "This paper examines the growth of cracks from small naturally occurring discontinuities in AA7050-T7451 coupons tested under a miniTWIST load spectrum. A markerband is inserted in the spectrum to aid in Quantitative Fractography. The resulting crack growth curve is reasonably exponential in nature, which indicates that crack growth under combat aircraft spectra and civil aircraft transport spectra is similar. It is also shown that the Hartman-Schijve crack growth equation can be used to compute the crack growth histories and account for the scatter seen in the various tests by allowing for small changes in the value of ΔKthr.",

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AU - Barter, S.

AU - Jones, R.

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N2 - This paper examines the growth of cracks from small naturally occurring discontinuities in AA7050-T7451 coupons tested under a miniTWIST load spectrum. A markerband is inserted in the spectrum to aid in Quantitative Fractography. The resulting crack growth curve is reasonably exponential in nature, which indicates that crack growth under combat aircraft spectra and civil aircraft transport spectra is similar. It is also shown that the Hartman-Schijve crack growth equation can be used to compute the crack growth histories and account for the scatter seen in the various tests by allowing for small changes in the value of ΔKthr.

AB - This paper examines the growth of cracks from small naturally occurring discontinuities in AA7050-T7451 coupons tested under a miniTWIST load spectrum. A markerband is inserted in the spectrum to aid in Quantitative Fractography. The resulting crack growth curve is reasonably exponential in nature, which indicates that crack growth under combat aircraft spectra and civil aircraft transport spectra is similar. It is also shown that the Hartman-Schijve crack growth equation can be used to compute the crack growth histories and account for the scatter seen in the various tests by allowing for small changes in the value of ΔKthr.

KW - Aircraft sustainment

KW - Etch pits

KW - Fatigue crack growth

KW - Fatigue variability

KW - Lead cracks

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SP - 10

EP - 16

JO - International Journal of Fatigue

JF - International Journal of Fatigue

ER -

On the growth of cracks from etch pits and the scatter associated with them under a miniTWIST spectrum

Abstract

Keywords

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