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Fatigue crack closure: a myth or a misconception?

Research output: Contribution to journalArticle

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Fatigue crack closure: a myth or a misconception? / Tong, Jie; Alshammrei, Shaher; Lin, Bing; Wigger, Tim; Marrow, James.

In: Fatigue & Fracture of Engineering Materials & Structures, 29.07.2019.

Research output: Contribution to journalArticle

Harvard

Tong, J, Alshammrei, S, Lin, B, Wigger, T & Marrow, J 2019, 'Fatigue crack closure: a myth or a misconception?', Fatigue & Fracture of Engineering Materials & Structures. https://doi.org/10.1111/ffe.13112

APA

Tong, J., Alshammrei, S., Lin, B., Wigger, T., & Marrow, J. (2019). Fatigue crack closure: a myth or a misconception? Fatigue & Fracture of Engineering Materials & Structures. https://doi.org/10.1111/ffe.13112

Vancouver

Tong J, Alshammrei S, Lin B, Wigger T, Marrow J. Fatigue crack closure: a myth or a misconception? Fatigue & Fracture of Engineering Materials & Structures. 2019 Jul 29. https://doi.org/10.1111/ffe.13112

Author

Tong, Jie ; Alshammrei, Shaher ; Lin, Bing ; Wigger, Tim ; Marrow, James. / Fatigue crack closure: a myth or a misconception?. In: Fatigue & Fracture of Engineering Materials & Structures. 2019.

Bibtex

@article{06a952b2a0114f02b4bcdef1219d5a4f,
title = "Fatigue crack closure: a myth or a misconception?",
abstract = "In this paper, we have extended our previous study on fatigue crack closure (Tong et al, FFEMS, 2018) to examine the phenomenon of crack opening displacement (COD) and its impact on the crack tip fields in both 2D and 3D specimen geometries using full-field experimental measurements and integrated finite element modelling. Digital image correlation (DIC) and digital volume correlation (DVC) were used to measure the near-tip material responses on the surfaces (DIC) and the interior (DVC) of the specimens. Materials with elastic-plastic and large plastic characteristics were chosen for the study, where plasticity-induced premature contact between the crack flanks is known to occur. Displacement maps around the cracks were obtained using DIC and DVC at selected load increments, and were introduced as boundary conditions into the finite element (FE) models to obtain the “effective” crack driving force in terms of J-integral, and the results were compared with those “nominal” from the standard FE analysis. Both visual observation and compliance curves were used to determine the “crack opening” levels; whilst the impacts of the crack opening on the crack driving force J and the normal strains ahead of the crack tip were evaluated in 2D and 3D. The results from the study indicate that, crack closure, although clearly identifiable in the compliance curves, does not appear to impact on global crack driving force, such as J-integral, or strains ahead of the crack tip, hence it may well be a misconception.",
keywords = "crack closure, DIC, DVC, fatigue crack, J-integral, strain",
author = "Jie Tong and Shaher Alshammrei and Bing Lin and Tim Wigger and James Marrow",
year = "2019",
month = jul,
day = "29",
doi = "10.1111/ffe.13112",
language = "English",
journal = "Fatigue & Fracture of Engineering Materials & Structures",
issn = "1460-2695",
publisher = "Wiley-Blackwell",

}

RIS

TY - JOUR

T1 - Fatigue crack closure: a myth or a misconception?

AU - Tong, Jie

AU - Alshammrei, Shaher

AU - Lin, Bing

AU - Wigger, Tim

AU - Marrow, James

PY - 2019/7/29

Y1 - 2019/7/29

N2 - In this paper, we have extended our previous study on fatigue crack closure (Tong et al, FFEMS, 2018) to examine the phenomenon of crack opening displacement (COD) and its impact on the crack tip fields in both 2D and 3D specimen geometries using full-field experimental measurements and integrated finite element modelling. Digital image correlation (DIC) and digital volume correlation (DVC) were used to measure the near-tip material responses on the surfaces (DIC) and the interior (DVC) of the specimens. Materials with elastic-plastic and large plastic characteristics were chosen for the study, where plasticity-induced premature contact between the crack flanks is known to occur. Displacement maps around the cracks were obtained using DIC and DVC at selected load increments, and were introduced as boundary conditions into the finite element (FE) models to obtain the “effective” crack driving force in terms of J-integral, and the results were compared with those “nominal” from the standard FE analysis. Both visual observation and compliance curves were used to determine the “crack opening” levels; whilst the impacts of the crack opening on the crack driving force J and the normal strains ahead of the crack tip were evaluated in 2D and 3D. The results from the study indicate that, crack closure, although clearly identifiable in the compliance curves, does not appear to impact on global crack driving force, such as J-integral, or strains ahead of the crack tip, hence it may well be a misconception.

AB - In this paper, we have extended our previous study on fatigue crack closure (Tong et al, FFEMS, 2018) to examine the phenomenon of crack opening displacement (COD) and its impact on the crack tip fields in both 2D and 3D specimen geometries using full-field experimental measurements and integrated finite element modelling. Digital image correlation (DIC) and digital volume correlation (DVC) were used to measure the near-tip material responses on the surfaces (DIC) and the interior (DVC) of the specimens. Materials with elastic-plastic and large plastic characteristics were chosen for the study, where plasticity-induced premature contact between the crack flanks is known to occur. Displacement maps around the cracks were obtained using DIC and DVC at selected load increments, and were introduced as boundary conditions into the finite element (FE) models to obtain the “effective” crack driving force in terms of J-integral, and the results were compared with those “nominal” from the standard FE analysis. Both visual observation and compliance curves were used to determine the “crack opening” levels; whilst the impacts of the crack opening on the crack driving force J and the normal strains ahead of the crack tip were evaluated in 2D and 3D. The results from the study indicate that, crack closure, although clearly identifiable in the compliance curves, does not appear to impact on global crack driving force, such as J-integral, or strains ahead of the crack tip, hence it may well be a misconception.

KW - crack closure

KW - DIC

KW - DVC

KW - fatigue crack

KW - J-integral

KW - strain

U2 - 10.1111/ffe.13112

DO - 10.1111/ffe.13112

M3 - Article

JO - Fatigue & Fracture of Engineering Materials & Structures

JF - Fatigue & Fracture of Engineering Materials & Structures

SN - 1460-2695

ER -

ID: 14844839