Quantification of the interaction within defect populations on fatigue behavior in an aluminum alloy

P. Li; P. D. Lee; D. M. Maijer; T. C. Lindley

doi:10.1016/j.actamat.2009.04.008

Quantification of the interaction within defect populations on fatigue behavior in an aluminum alloy

P. Li, P. D. Lee, D. M. Maijer, T. C. Lindley

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

Abstract

The interaction between fatigue crack evolution and porosity in A356-T6 alloys was characterized using both X-ray microtomography and finite-element analysis. The formation and propagation of fatigue cracks are dominated by the highest local stress-strain concentration (kg = sqrt(kσ kε)) caused by the presence of porosity adjacent to the free surface and the crack tip, respectively. The kg factor proved to be a suitable parameter to quantify the influence of porosity on fatigue cracking and to predict the fatigue crack growth rate (da / dN). Although microporosity has a complex, tortuous morphology, a simple method for mapping the shape to an idealized sphere was proposed. It was found that using a sphere with equal projected area in the plane normal to the loading direction was a good approximation, allowing an equivalent kg to be calculated. © 2009 Acta Materialia Inc.

Original language	English
Pages (from-to)	3539-3548
Number of pages	9
Journal	Acta Materialia
Volume	57
Issue number	12
DOIs	https://doi.org/10.1016/j.actamat.2009.04.008
Publication status	Published - Jul 2009

Keywords

Aluminum alloy
Defect populations
Fatigue
Finite-element analysis
X-ray microtomography

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10.1016/j.actamat.2009.04.008

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title = "Quantification of the interaction within defect populations on fatigue behavior in an aluminum alloy",

abstract = "The interaction between fatigue crack evolution and porosity in A356-T6 alloys was characterized using both X-ray microtomography and finite-element analysis. The formation and propagation of fatigue cracks are dominated by the highest local stress-strain concentration (kg = sqrt(kσ kε)) caused by the presence of porosity adjacent to the free surface and the crack tip, respectively. The kg factor proved to be a suitable parameter to quantify the influence of porosity on fatigue cracking and to predict the fatigue crack growth rate (da / dN). Although microporosity has a complex, tortuous morphology, a simple method for mapping the shape to an idealized sphere was proposed. It was found that using a sphere with equal projected area in the plane normal to the loading direction was a good approximation, allowing an equivalent kg to be calculated. {\textcopyright} 2009 Acta Materialia Inc.",

keywords = "Aluminum alloy, Defect populations, Fatigue, Finite-element analysis, X-ray microtomography",

author = "P. Li and Lee, {P. D.} and Maijer, {D. M.} and Lindley, {T. C.}",

year = "2009",

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TY - JOUR

T1 - Quantification of the interaction within defect populations on fatigue behavior in an aluminum alloy

AU - Li, P.

AU - Lee, P. D.

AU - Maijer, D. M.

AU - Lindley, T. C.

PY - 2009/7

Y1 - 2009/7

N2 - The interaction between fatigue crack evolution and porosity in A356-T6 alloys was characterized using both X-ray microtomography and finite-element analysis. The formation and propagation of fatigue cracks are dominated by the highest local stress-strain concentration (kg = sqrt(kσ kε)) caused by the presence of porosity adjacent to the free surface and the crack tip, respectively. The kg factor proved to be a suitable parameter to quantify the influence of porosity on fatigue cracking and to predict the fatigue crack growth rate (da / dN). Although microporosity has a complex, tortuous morphology, a simple method for mapping the shape to an idealized sphere was proposed. It was found that using a sphere with equal projected area in the plane normal to the loading direction was a good approximation, allowing an equivalent kg to be calculated. © 2009 Acta Materialia Inc.

AB - The interaction between fatigue crack evolution and porosity in A356-T6 alloys was characterized using both X-ray microtomography and finite-element analysis. The formation and propagation of fatigue cracks are dominated by the highest local stress-strain concentration (kg = sqrt(kσ kε)) caused by the presence of porosity adjacent to the free surface and the crack tip, respectively. The kg factor proved to be a suitable parameter to quantify the influence of porosity on fatigue cracking and to predict the fatigue crack growth rate (da / dN). Although microporosity has a complex, tortuous morphology, a simple method for mapping the shape to an idealized sphere was proposed. It was found that using a sphere with equal projected area in the plane normal to the loading direction was a good approximation, allowing an equivalent kg to be calculated. © 2009 Acta Materialia Inc.

KW - Aluminum alloy

KW - Defect populations

KW - Fatigue

KW - Finite-element analysis

KW - X-ray microtomography

U2 - 10.1016/j.actamat.2009.04.008

DO - 10.1016/j.actamat.2009.04.008

M3 - Article

SN - 1873-2453

VL - 57

SP - 3539

EP - 3548

JO - Acta Materialia

JF - Acta Materialia

IS - 12

ER -

Quantification of the interaction within defect populations on fatigue behavior in an aluminum alloy

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Keywords

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