Near tip strain evolution of a growing fatigue crack

M. L. Zhu; Y. W. Lu; C. Lupton; J. Tong

doi:10.3221/IGF-ESIS.33.09

Near tip strain evolution of a growing fatigue crack

M. L. Zhu, Y. W. Lu, C. Lupton, J. Tong

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Abstract

Near tip full-field strains in a growing fatigue crack have been studied in situ using the Digital Image Correlation (DIC) technique in a compact tension specimen of stainless steel 316L under tension-tension cyclic loading. An error analysis of displacements and strains has been carried out, and the results show that the precision of displacements and strains in the wake of the crack is worse than that in front of the crack. A method for the determination of crack tip location is proposed for the DIC analysis. Strain ratchetting is observed ahead of the growing fatigue crack tip and found to be dependent on the distance to the crack tip; whilst normal strains appear to stabilise behind the crack tip.

Original language	English
Pages (from-to)	67-72
Number of pages	6
Journal	Frattura ed Integrita Strutturale
Volume	9
Issue number	33
DOIs	https://doi.org/10.3221/IGF-ESIS.33.09
Publication status	Published - Jul 2015

Keywords

Crack tip
DIC
Error analysis
Fatigue crack growth
Strain ratchetting

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abstract = "Near tip full-field strains in a growing fatigue crack have been studied in situ using the Digital Image Correlation (DIC) technique in a compact tension specimen of stainless steel 316L under tension-tension cyclic loading. An error analysis of displacements and strains has been carried out, and the results show that the precision of displacements and strains in the wake of the crack is worse than that in front of the crack. A method for the determination of crack tip location is proposed for the DIC analysis. Strain ratchetting is observed ahead of the growing fatigue crack tip and found to be dependent on the distance to the crack tip; whilst normal strains appear to stabilise behind the crack tip.",

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T1 - Near tip strain evolution of a growing fatigue crack

AU - Zhu, M. L.

AU - Lu, Y. W.

AU - Lupton, C.

AU - Tong, J.

PY - 2015/7

Y1 - 2015/7

N2 - Near tip full-field strains in a growing fatigue crack have been studied in situ using the Digital Image Correlation (DIC) technique in a compact tension specimen of stainless steel 316L under tension-tension cyclic loading. An error analysis of displacements and strains has been carried out, and the results show that the precision of displacements and strains in the wake of the crack is worse than that in front of the crack. A method for the determination of crack tip location is proposed for the DIC analysis. Strain ratchetting is observed ahead of the growing fatigue crack tip and found to be dependent on the distance to the crack tip; whilst normal strains appear to stabilise behind the crack tip.

AB - Near tip full-field strains in a growing fatigue crack have been studied in situ using the Digital Image Correlation (DIC) technique in a compact tension specimen of stainless steel 316L under tension-tension cyclic loading. An error analysis of displacements and strains has been carried out, and the results show that the precision of displacements and strains in the wake of the crack is worse than that in front of the crack. A method for the determination of crack tip location is proposed for the DIC analysis. Strain ratchetting is observed ahead of the growing fatigue crack tip and found to be dependent on the distance to the crack tip; whilst normal strains appear to stabilise behind the crack tip.

KW - Crack tip

KW - DIC

KW - Error analysis

KW - Fatigue crack growth

KW - Strain ratchetting

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Near tip strain evolution of a growing fatigue crack

Abstract

Keywords

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