Characterisation of crack tip fields under non-uniform fatigue loading

D. Nowell; M. E. Kartal; P. F. P. De Matos

doi:10.3221/IGF-ESIS.25.01

Characterisation of crack tip fields under non-uniform fatigue loading

D. Nowell, M. E. Kartal, P. F. P. De Matos

Engineering

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Abstract

The paper analyses previously reported work, which uses digital image correlation to measure fatigue crack closure. As well as determining crack opening loads, the information on crack shape may be used to estimate the stress intensity factor, as well as other parameters in more complex models of crack tip fields. A number of specimens were subjected to single overload cycles, which produced a significant retardation in crack growth rate. The method previously applied to the analysis of constant amplitude loading is here used to analyse the single overload case. The stress intensity factor history is found to be very different in the two cases and the consequences of this observation for analysis of fatigue crack propagation are discussed.

Original language	English
Pages (from-to)	1-6
Number of pages	6
Journal	Frattura ed Integrità Strutturale
Volume	25
Issue number	7
DOIs	https://doi.org/10.3221/IGF-ESIS.25.01
Publication status	Published - 1 Jan 2013

Bibliographical note

P. F.P. de Matos would like to gratefully acknowledge the support of the Portuguese Fundação para a Ciência e a Tecnologia (FCT) for providing a D.Phil. scholarship (reference SFRH/BD/12989/2003, financed by POSI).

Keywords

Digital image correlation
Displacement measurement
Crack-tip fields
Elastic-plastic fatigue crack

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Characterisation of crack tip fields under non-uniform fatigue loading
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Cite this

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title = "Characterisation of crack tip fields under non-uniform fatigue loading",

abstract = "The paper analyses previously reported work, which uses digital image correlation to measure fatigue crack closure. As well as determining crack opening loads, the information on crack shape may be used to estimate the stress intensity factor, as well as other parameters in more complex models of crack tip fields. A number of specimens were subjected to single overload cycles, which produced a significant retardation in crack growth rate. The method previously applied to the analysis of constant amplitude loading is here used to analyse the single overload case. The stress intensity factor history is found to be very different in the two cases and the consequences of this observation for analysis of fatigue crack propagation are discussed.",

keywords = "Digital image correlation, Displacement measurement, Crack-tip fields, Elastic-plastic fatigue crack",

author = "D. Nowell and Kartal, {M. E.} and {De Matos}, {P. F. P.}",

note = "P. F.P. de Matos would like to gratefully acknowledge the support of the Portuguese Funda{\c c}{\~a}o para a Ci{\^e}ncia e a Tecnologia (FCT) for providing a D.Phil. scholarship (reference SFRH/BD/12989/2003, financed by POSI).",

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AU - De Matos, P. F. P.

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N2 - The paper analyses previously reported work, which uses digital image correlation to measure fatigue crack closure. As well as determining crack opening loads, the information on crack shape may be used to estimate the stress intensity factor, as well as other parameters in more complex models of crack tip fields. A number of specimens were subjected to single overload cycles, which produced a significant retardation in crack growth rate. The method previously applied to the analysis of constant amplitude loading is here used to analyse the single overload case. The stress intensity factor history is found to be very different in the two cases and the consequences of this observation for analysis of fatigue crack propagation are discussed.

AB - The paper analyses previously reported work, which uses digital image correlation to measure fatigue crack closure. As well as determining crack opening loads, the information on crack shape may be used to estimate the stress intensity factor, as well as other parameters in more complex models of crack tip fields. A number of specimens were subjected to single overload cycles, which produced a significant retardation in crack growth rate. The method previously applied to the analysis of constant amplitude loading is here used to analyse the single overload case. The stress intensity factor history is found to be very different in the two cases and the consequences of this observation for analysis of fatigue crack propagation are discussed.

KW - Digital image correlation

KW - Displacement measurement

KW - Crack-tip fields

KW - Elastic-plastic fatigue crack

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DO - 10.3221/IGF-ESIS.25.01

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JF - Frattura ed Integrità Strutturale

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ER -

Characterisation of crack tip fields under non-uniform fatigue loading

Abstract

Bibliographical note

Keywords

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