In situ near-tip normal strain evolution of a growing fatigue crack

Ming-Liang Zhu; Y-W Lu; Colin John Lupton; Jie Tong

doi:10.1111/ffe.12391

In situ near-tip normal strain evolution of a growing fatigue crack

Ming-Liang Zhu
, Y-W Lu
, Colin John Lupton
, Jie Tong

East China University of Science and Technology

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

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Abstract

Normal strains near 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 the measured displacements and strains has been carried out, and the results show that the precisions of displacements and strains in the direction perpendicular to the crack plane and ahead of the crack are better than those parallel to the crack plane and in the wake of the crack. The errors in the measured displacements are in the range of 0.06 to 0.1 m and between 0.2% and 0.4% for the measured strains, the latter are well below the critical strain at the onset of crack growth about 8%. Strain ratchetting was found ahead of the growing fatigue crack tip, albeit very close to the crack tip.

Original language	English
Pages (from-to)	950-955
Journal	Fatigue & Fracture of Engineering Materials & Structures
Volume	39
Issue number	8
Early online date	22 Jan 2016
DOIs	https://doi.org/10.1111/ffe.12391
Publication status	Published - Aug 2016

Keywords

DIC
crack tip
error analysis
fatigue crack growth
strain ratchetting

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10.1111/ffe.12391

In_Situ_Near_Tip_Normal_Strain_Evolution_of_a_Growing_Fatigue_Crack
This is the peer reviewed version of the following article: Zhu, M.-L., Lu, Y.-W., Lupton, C., and Tong, J. (2016) In situ near-tip normal strain evolution of a growing fatigue crack. Fatigue Fract Engng Mater Struct, which has been published in final form at 10.1111/ffe.12391. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
Accepted author manuscript (Post-print), 1.98 MB

Cite this

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title = "In situ near-tip normal strain evolution of a growing fatigue crack",

abstract = "Normal strains near 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 the measured displacements and strains has been carried out, and the results show that the precisions of displacements and strains in the direction perpendicular to the crack plane and ahead of the crack are better than those parallel to the crack plane and in the wake of the crack. The errors in the measured displacements are in the range of 0.06 to 0.1 m and between 0.2\% and 0.4\% for the measured strains, the latter are well below the critical strain at the onset of crack growth about 8\%. Strain ratchetting was found ahead of the growing fatigue crack tip, albeit very close to the crack tip.",

keywords = "DIC, crack tip, error analysis, fatigue crack growth, strain ratchetting",

author = "Ming-Liang Zhu and Y-W Lu and Lupton, \{Colin John\} and Jie Tong",

note = "Accepted Date: 12 December 2015",

year = "2016",

month = aug,

doi = "10.1111/ffe.12391",

language = "English",

volume = "39",

pages = "950--955",

journal = "Fatigue \& Fracture of Engineering Materials \& Structures",

issn = "1460-2695",

publisher = "Wiley-Blackwell",

number = "8",

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TY - JOUR

T1 - In situ near-tip normal strain evolution of a growing fatigue crack

AU - Zhu, Ming-Liang

AU - Lu, Y-W

AU - Lupton, Colin John

AU - Tong, Jie

N1 - Accepted Date: 12 December 2015

PY - 2016/8

Y1 - 2016/8

N2 - Normal strains near 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 the measured displacements and strains has been carried out, and the results show that the precisions of displacements and strains in the direction perpendicular to the crack plane and ahead of the crack are better than those parallel to the crack plane and in the wake of the crack. The errors in the measured displacements are in the range of 0.06 to 0.1 m and between 0.2% and 0.4% for the measured strains, the latter are well below the critical strain at the onset of crack growth about 8%. Strain ratchetting was found ahead of the growing fatigue crack tip, albeit very close to the crack tip.

AB - Normal strains near 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 the measured displacements and strains has been carried out, and the results show that the precisions of displacements and strains in the direction perpendicular to the crack plane and ahead of the crack are better than those parallel to the crack plane and in the wake of the crack. The errors in the measured displacements are in the range of 0.06 to 0.1 m and between 0.2% and 0.4% for the measured strains, the latter are well below the critical strain at the onset of crack growth about 8%. Strain ratchetting was found ahead of the growing fatigue crack tip, albeit very close to the crack tip.

KW - DIC

KW - crack tip

KW - error analysis

KW - fatigue crack growth

KW - strain ratchetting

U2 - 10.1111/ffe.12391

DO - 10.1111/ffe.12391

M3 - Article

SN - 1460-2695

VL - 39

SP - 950

EP - 955

JO - Fatigue & Fracture of Engineering Materials & Structures

JF - Fatigue & Fracture of Engineering Materials & Structures

IS - 8

ER -

In situ near-tip normal strain evolution of a growing fatigue crack

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Keywords

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