Effect of Plastic Deformation on Compliance Curve Based Crack Closure Measurement

Andrew Lewis; Muhodin Mohin; Andreas Chrysanthou; Yigeng Xu

doi:10.4028/www.scientific.net/KEM.713.240

Effect of Plastic Deformation on Compliance Curve Based Crack Closure Measurement

Andrew Lewis, Muhodin Mohin, Andreas Chrysanthou, Yigeng Xu

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

2 Citations (Scopus)

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Abstract

Fatigue crack growth depends heavily on near tip stress-strain behavior controlled by many micromechanical and microstructural factors. Crack closure is widely used to rationalize crack growth behaviour under complex loading conditions. Reliable crack closure measurement is essential for enhanced damage tolerance design and remains a challenge to the industry. This paper focuses on the effect of plastic deformation ahead of a notch/crack on the non-linearity of compliance curves of 6082-T651 aluminium alloy specimens to highlight a potential issue in the conventional compliance curve based crack closure measurement technique. Experimental and numerical simulation results demonstrate that plastic deformation ahead of the notch will introduce non-linear stress-strain behavior in the absence of crack closure. It is proposed that the effect of crack tip plasticity on the non-linearity of the compliance curve be separated to obtain reliable crack closure measurement.

Original language	English
Pages (from-to)	240-243
Number of pages	4
Journal	Key Engineering Materials
Volume	713
DOIs	https://doi.org/10.4028/www.scientific.net/KEM.713.240
Publication status	Published - 1 Sept 2016

Keywords

Compliance curve
Damage tolerance design
crack closure

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FDM2016_Yigeng_Xu_et_al_Accepted author manuscript, 675 KBLicence: Other

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@article{d6795617589042b3bbf9330224838443,

title = "Effect of Plastic Deformation on Compliance Curve Based Crack Closure Measurement",

abstract = "Fatigue crack growth depends heavily on near tip stress-strain behavior controlled by many micromechanical and microstructural factors. Crack closure is widely used to rationalize crack growth behaviour under complex loading conditions. Reliable crack closure measurement is essential for enhanced damage tolerance design and remains a challenge to the industry. This paper focuses on the effect of plastic deformation ahead of a notch/crack on the non-linearity of compliance curves of 6082-T651 aluminium alloy specimens to highlight a potential issue in the conventional compliance curve based crack closure measurement technique. Experimental and numerical simulation results demonstrate that plastic deformation ahead of the notch will introduce non-linear stress-strain behavior in the absence of crack closure. It is proposed that the effect of crack tip plasticity on the non-linearity of the compliance curve be separated to obtain reliable crack closure measurement.",

keywords = "Compliance curve, Damage tolerance design, crack closure",

author = "Andrew Lewis and Muhodin Mohin and Andreas Chrysanthou and Yigeng Xu",

note = "This is a pre-copyedited, author-produced pdf of an article accepted for publication in Key Engineering Materials following peer review. The version of record, M.A. Mohin, Y.G. Xu, A. Lewis, A. Chrysanthou, {"}Effect of Plastic Deformation on Compliance Curve Based Crack Closure Measurement{"}, Key Engineering Materials, Vol. 713, pp. 240-243, 2016, published by Trans Tech Publications Ltd, is available online at doi: 10.4028/www.scientific.net/KEM.713.240. ",

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doi = "10.4028/www.scientific.net/KEM.713.240",

language = "English",

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T1 - Effect of Plastic Deformation on Compliance Curve Based Crack Closure Measurement

AU - Lewis, Andrew

AU - Mohin, Muhodin

AU - Chrysanthou, Andreas

AU - Xu, Yigeng

N1 - This is a pre-copyedited, author-produced pdf of an article accepted for publication in Key Engineering Materials following peer review. The version of record, M.A. Mohin, Y.G. Xu, A. Lewis, A. Chrysanthou, "Effect of Plastic Deformation on Compliance Curve Based Crack Closure Measurement", Key Engineering Materials, Vol. 713, pp. 240-243, 2016, published by Trans Tech Publications Ltd, is available online at doi: 10.4028/www.scientific.net/KEM.713.240.

PY - 2016/9/1

Y1 - 2016/9/1

N2 - Fatigue crack growth depends heavily on near tip stress-strain behavior controlled by many micromechanical and microstructural factors. Crack closure is widely used to rationalize crack growth behaviour under complex loading conditions. Reliable crack closure measurement is essential for enhanced damage tolerance design and remains a challenge to the industry. This paper focuses on the effect of plastic deformation ahead of a notch/crack on the non-linearity of compliance curves of 6082-T651 aluminium alloy specimens to highlight a potential issue in the conventional compliance curve based crack closure measurement technique. Experimental and numerical simulation results demonstrate that plastic deformation ahead of the notch will introduce non-linear stress-strain behavior in the absence of crack closure. It is proposed that the effect of crack tip plasticity on the non-linearity of the compliance curve be separated to obtain reliable crack closure measurement.

AB - Fatigue crack growth depends heavily on near tip stress-strain behavior controlled by many micromechanical and microstructural factors. Crack closure is widely used to rationalize crack growth behaviour under complex loading conditions. Reliable crack closure measurement is essential for enhanced damage tolerance design and remains a challenge to the industry. This paper focuses on the effect of plastic deformation ahead of a notch/crack on the non-linearity of compliance curves of 6082-T651 aluminium alloy specimens to highlight a potential issue in the conventional compliance curve based crack closure measurement technique. Experimental and numerical simulation results demonstrate that plastic deformation ahead of the notch will introduce non-linear stress-strain behavior in the absence of crack closure. It is proposed that the effect of crack tip plasticity on the non-linearity of the compliance curve be separated to obtain reliable crack closure measurement.

KW - Compliance curve

KW - Damage tolerance design

KW - crack closure

U2 - 10.4028/www.scientific.net/KEM.713.240

DO - 10.4028/www.scientific.net/KEM.713.240

M3 - Article

SN - 1013-9826

VL - 713

SP - 240

EP - 243

JO - Key Engineering Materials

JF - Key Engineering Materials

ER -

Effect of Plastic Deformation on Compliance Curve Based Crack Closure Measurement

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Keywords

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