Some experimental observations on crack closure and crack-tip plasticity

P. Lopez-Crespo; A. Shterenlikht; J. R. Yates; E. A. Patterson; P. J. Withers

doi:10.1111/j.1460-2695.2009.01345.x

Some experimental observations on crack closure and crack-tip plasticity

P. Lopez-Crespo, A. Shterenlikht, J. R. Yates, E. A. Patterson, P. J. Withers

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

Abstract

This study presents a methodology for evaluating crack closure and the effect of crack-tip plasticity on stress intensity. Full-field displacement maps obtained by digital image correlation are used to obtain the mixed-mode, crack-driving force. The methodology allows the quantification of the effect of a range of contact phenomena: effects arising from interlocking, plastic deformation of crack face asperities and wedging generated as a consequence of sliding displacements of fatigue cracks have been identified. By evaluating the effective crack-tip stress intensity factor, crack opening levels can be quantified for both mode I and mode II. Moreover, the approach can take into account plasticity effects local to the crack in determining the stress intensity factor. All the information can be extracted in a non-contacting fashion with equipment that can be easily incorporated into industrial environments. © 2009 Blackwell Publishing.

Original language	English
Pages (from-to)	418-429
Number of pages	11
Journal	Fatigue and Fracture of Engineering Materials and Structures
Volume	32
Issue number	5
DOIs	https://doi.org/10.1111/j.1460-2695.2009.01345.x
Publication status	Published - 2009

Keywords

Digital image correlation
Effective stress intensity factor
Fatigue crack closure
Plastic zone

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10.1111/j.1460-2695.2009.01345.x

Cite this

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title = "Some experimental observations on crack closure and crack-tip plasticity",

abstract = "This study presents a methodology for evaluating crack closure and the effect of crack-tip plasticity on stress intensity. Full-field displacement maps obtained by digital image correlation are used to obtain the mixed-mode, crack-driving force. The methodology allows the quantification of the effect of a range of contact phenomena: effects arising from interlocking, plastic deformation of crack face asperities and wedging generated as a consequence of sliding displacements of fatigue cracks have been identified. By evaluating the effective crack-tip stress intensity factor, crack opening levels can be quantified for both mode I and mode II. Moreover, the approach can take into account plasticity effects local to the crack in determining the stress intensity factor. All the information can be extracted in a non-contacting fashion with equipment that can be easily incorporated into industrial environments. {\textcopyright} 2009 Blackwell Publishing.",

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T1 - Some experimental observations on crack closure and crack-tip plasticity

AU - Lopez-Crespo, P.

AU - Shterenlikht, A.

AU - Yates, J. R.

AU - Patterson, E. A.

AU - Withers, P. J.

N1 - Times Cited: 0

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Y1 - 2009

N2 - This study presents a methodology for evaluating crack closure and the effect of crack-tip plasticity on stress intensity. Full-field displacement maps obtained by digital image correlation are used to obtain the mixed-mode, crack-driving force. The methodology allows the quantification of the effect of a range of contact phenomena: effects arising from interlocking, plastic deformation of crack face asperities and wedging generated as a consequence of sliding displacements of fatigue cracks have been identified. By evaluating the effective crack-tip stress intensity factor, crack opening levels can be quantified for both mode I and mode II. Moreover, the approach can take into account plasticity effects local to the crack in determining the stress intensity factor. All the information can be extracted in a non-contacting fashion with equipment that can be easily incorporated into industrial environments. © 2009 Blackwell Publishing.

AB - This study presents a methodology for evaluating crack closure and the effect of crack-tip plasticity on stress intensity. Full-field displacement maps obtained by digital image correlation are used to obtain the mixed-mode, crack-driving force. The methodology allows the quantification of the effect of a range of contact phenomena: effects arising from interlocking, plastic deformation of crack face asperities and wedging generated as a consequence of sliding displacements of fatigue cracks have been identified. By evaluating the effective crack-tip stress intensity factor, crack opening levels can be quantified for both mode I and mode II. Moreover, the approach can take into account plasticity effects local to the crack in determining the stress intensity factor. All the information can be extracted in a non-contacting fashion with equipment that can be easily incorporated into industrial environments. © 2009 Blackwell Publishing.

KW - Digital image correlation

KW - Effective stress intensity factor

KW - Fatigue crack closure

KW - Plastic zone

U2 - 10.1111/j.1460-2695.2009.01345.x

DO - 10.1111/j.1460-2695.2009.01345.x

M3 - Article

SN - 1460-2695

VL - 32

SP - 418

EP - 429

JO - Fatigue and Fracture of Engineering Materials and Structures

JF - Fatigue and Fracture of Engineering Materials and Structures

IS - 5

ER -

Some experimental observations on crack closure and crack-tip plasticity

Abstract

Keywords

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