Study of cyclic crack-tip opening displacement of microstructurally small fatigue crack using digital image correlation

Ilari Tillikainen; Pasquale Gallo; Pauli Lehto; Heikki Remes

doi:10.1111/ffe.14124

Study of cyclic crack-tip opening displacement of microstructurally small fatigue crack using digital image correlation

Ilari Tillikainen, Pasquale Gallo^*, Pauli Lehto, Heikki Remes

^*Corresponding author for this work

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

2 Citations (Scopus)

27 Downloads (Pure)

Abstract

The current work investigates the relationship between the crack growth rate (CGR) and the cyclic crack-tip opening displacement (ΔCTOD) of microstructurally small fatigue cracks by using high-resolution digital image correlation (DIC). Load-controlled fatigue tests were conducted on small-scale specimens of 18%Cr body-centered cubic ferritic stainless steel. Microstructurally small fatigue crack growth was analyzed based on accurate high sample-rate measurements, starting from a sub-grain crack length up to seven times the volume-weighted grain size d_v = 224 μm. Under these experimental conditions, the high-resolution analyses reveal that variation from the otherwise linear relationship between CGR and ΔCTOD on double logarithmic scale is due to the crack-tip bypassing an inhomogeneous shear strain localization zone. In this zone, ΔCTOD is not able to characterize the behavior of microstructurally small fatigue cracks. Outside the shear strain localization zone, ΔCTOD still is a valid crack driving force parameter.

Original language	English
Pages (from-to)	4103-4118
Number of pages	16
Journal	Fatigue and Fracture of Engineering Materials and Structures
Volume	46
Issue number	11
Early online date	10 Aug 2023
DOIs	https://doi.org/10.1111/ffe.14124
Publication status	Published - Nov 2023
MoE publication type	A1 Journal article-refereed

Keywords

crack growth rate
crack tip opening displacement
ferritic stainless steel
small crack
strain localization

Access to Document

10.1111/ffe.14124Licence: CC BY

Fatigue Fract Eng Mat Struct - 2023 - Tillikainen - Study of cyclic crack‐tip opening displacement of microstructurally-1Final published version, 6.94 MBLicence: CC BY

Cite this

@article{534b4d543c754d5f8643876ad04ba4e9,

title = "Study of cyclic crack-tip opening displacement of microstructurally small fatigue crack using digital image correlation",

abstract = "The current work investigates the relationship between the crack growth rate (CGR) and the cyclic crack-tip opening displacement (ΔCTOD) of microstructurally small fatigue cracks by using high-resolution digital image correlation (DIC). Load-controlled fatigue tests were conducted on small-scale specimens of 18%Cr body-centered cubic ferritic stainless steel. Microstructurally small fatigue crack growth was analyzed based on accurate high sample-rate measurements, starting from a sub-grain crack length up to seven times the volume-weighted grain size dv = 224 μm. Under these experimental conditions, the high-resolution analyses reveal that variation from the otherwise linear relationship between CGR and ΔCTOD on double logarithmic scale is due to the crack-tip bypassing an inhomogeneous shear strain localization zone. In this zone, ΔCTOD is not able to characterize the behavior of microstructurally small fatigue cracks. Outside the shear strain localization zone, ΔCTOD still is a valid crack driving force parameter.",

keywords = "crack growth rate, crack tip opening displacement, ferritic stainless steel, small crack, strain localization",

author = "Ilari Tillikainen and Pasquale Gallo and Pauli Lehto and Heikki Remes",

note = "Funding Information: The present research was supported by the Academy of Finland (decisions nos. 298762 and 321244). We greatly appreciate the support provided by the laboratory technician Kim Widell and Dr. Evgenii Malitckii at Aalto University in planning and executing of the experimental tests, and by Manner Peik. Publisher Copyright: {\textcopyright} 2023 The Authors. Fatigue & Fracture of Engineering Materials & Structures published by John Wiley & Sons Ltd.",

year = "2023",

month = nov,

doi = "10.1111/ffe.14124",

language = "English",

volume = "46",

pages = "4103--4118",

journal = "Fatigue and Fracture of Engineering Materials and Structures",

issn = "8756-758X",

publisher = "Wiley-Blackwell",

number = "11",

}

TY - JOUR

T1 - Study of cyclic crack-tip opening displacement of microstructurally small fatigue crack using digital image correlation

AU - Tillikainen, Ilari

AU - Gallo, Pasquale

AU - Lehto, Pauli

AU - Remes, Heikki

N1 - Funding Information: The present research was supported by the Academy of Finland (decisions nos. 298762 and 321244). We greatly appreciate the support provided by the laboratory technician Kim Widell and Dr. Evgenii Malitckii at Aalto University in planning and executing of the experimental tests, and by Manner Peik. Publisher Copyright: © 2023 The Authors. Fatigue & Fracture of Engineering Materials & Structures published by John Wiley & Sons Ltd.

PY - 2023/11

Y1 - 2023/11

N2 - The current work investigates the relationship between the crack growth rate (CGR) and the cyclic crack-tip opening displacement (ΔCTOD) of microstructurally small fatigue cracks by using high-resolution digital image correlation (DIC). Load-controlled fatigue tests were conducted on small-scale specimens of 18%Cr body-centered cubic ferritic stainless steel. Microstructurally small fatigue crack growth was analyzed based on accurate high sample-rate measurements, starting from a sub-grain crack length up to seven times the volume-weighted grain size dv = 224 μm. Under these experimental conditions, the high-resolution analyses reveal that variation from the otherwise linear relationship between CGR and ΔCTOD on double logarithmic scale is due to the crack-tip bypassing an inhomogeneous shear strain localization zone. In this zone, ΔCTOD is not able to characterize the behavior of microstructurally small fatigue cracks. Outside the shear strain localization zone, ΔCTOD still is a valid crack driving force parameter.

AB - The current work investigates the relationship between the crack growth rate (CGR) and the cyclic crack-tip opening displacement (ΔCTOD) of microstructurally small fatigue cracks by using high-resolution digital image correlation (DIC). Load-controlled fatigue tests were conducted on small-scale specimens of 18%Cr body-centered cubic ferritic stainless steel. Microstructurally small fatigue crack growth was analyzed based on accurate high sample-rate measurements, starting from a sub-grain crack length up to seven times the volume-weighted grain size dv = 224 μm. Under these experimental conditions, the high-resolution analyses reveal that variation from the otherwise linear relationship between CGR and ΔCTOD on double logarithmic scale is due to the crack-tip bypassing an inhomogeneous shear strain localization zone. In this zone, ΔCTOD is not able to characterize the behavior of microstructurally small fatigue cracks. Outside the shear strain localization zone, ΔCTOD still is a valid crack driving force parameter.

KW - crack growth rate

KW - crack tip opening displacement

KW - ferritic stainless steel

KW - small crack

KW - strain localization

UR - http://www.scopus.com/inward/record.url?scp=85167624523&partnerID=8YFLogxK

U2 - 10.1111/ffe.14124

DO - 10.1111/ffe.14124

M3 - Article

AN - SCOPUS:85167624523

SN - 8756-758X

VL - 46

SP - 4103

EP - 4118

JO - Fatigue and Fracture of Engineering Materials and Structures

JF - Fatigue and Fracture of Engineering Materials and Structures

IS - 11

ER -

Study of cyclic crack-tip opening displacement of microstructurally small fatigue crack using digital image correlation

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

-: Multiscale models for the fatigue assessment of engineering applications: experimental investigation of fatigue mechanisms at micro and nanoscale.

Microstructure-based Continuum Damage Modelling of Fatigue in High-performance Welds

Cite this

Study of cyclic crack-tip opening displacement of microstructurally small fatigue crack using digital image correlation

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Projects

-: Multiscale models for the fatigue assessment of engineering applications: experimental investigation of fatigue mechanisms at micro and nanoscale.

Microstructure-based Continuum Damage Modelling of Fatigue in High-performance Welds

Cite this