Mechanical length scales and their link to fatigue crack growth kinetics in beta-annealed Ti-6Al-4V

Pedro Peralta; T. Villarreal; I. Atodaria; Aditi Chattopadhyay

doi:10.1016/j.scriptamat.2011.09.018

Mechanical length scales and their link to fatigue crack growth kinetics in beta-annealed Ti-6Al-4V

Pedro Peralta, T. Villarreal, I. Atodaria, Aditi Chattopadhyay

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

11 Scopus citations

Abstract

Correlations among microstructure, crack-tip fields and fatigue fracture are studied in beta-annealed Ti-6Al-4V. By means of digital image correlation, the area integral of the opening strain (_int) over the cyclic plastic zone was obtained, which was proportional to ΔK^m, where m is the Paris exponent, so that da/dN ∝ _int. Analysis shows that m≅2(2+(1+^n′)^-1) where n′ is the cyclic hardening exponent (0 ≤ n′ ≤ 1). This predicts 5 ≤ m ≤ 6, in agreement with experiments, and strongly suggests that fatigue fracture of beta-annealed Ti-6Al-4V can be described using non-local strain parameters.

Original language	English (US)
Pages (from-to)	13-16
Number of pages	4
Journal	Scripta Materialia
Volume	66
Issue number	1
DOIs	https://doi.org/10.1016/j.scriptamat.2011.09.018
State	Published - Jan 2012

Keywords

Fatigue
Fracture
Microstructure
Plasticity
Titanium alloys

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys

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10.1016/j.scriptamat.2011.09.018

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@article{303d718bd86546eda5f8299d92435c50,

title = "Mechanical length scales and their link to fatigue crack growth kinetics in beta-annealed Ti-6Al-4V",

abstract = "Correlations among microstructure, crack-tip fields and fatigue fracture are studied in beta-annealed Ti-6Al-4V. By means of digital image correlation, the area integral of the opening strain (int) over the cyclic plastic zone was obtained, which was proportional to ΔKm, where m is the Paris exponent, so that da/dN ∝ int. Analysis shows that m≅2(2+(1+n′)-1) where n′ is the cyclic hardening exponent (0 ≤ n′ ≤ 1). This predicts 5 ≤ m ≤ 6, in agreement with experiments, and strongly suggests that fatigue fracture of beta-annealed Ti-6Al-4V can be described using non-local strain parameters.",

keywords = "Fatigue, Fracture, Microstructure, Plasticity, Titanium alloys",

author = "Pedro Peralta and T. Villarreal and I. Atodaria and Aditi Chattopadhyay",

note = "Funding Information: This work was funded by the Multi-University Research Initiative project on Structural Health Monitoring at ASU, under AFOSR Grant FA95550-06-1-0309 , David Stargel, program manager. Dallas Kingsbury (ASU) is thanked for his help with fatigue testing. ",

year = "2012",

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doi = "10.1016/j.scriptamat.2011.09.018",

language = "English (US)",

volume = "66",

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T1 - Mechanical length scales and their link to fatigue crack growth kinetics in beta-annealed Ti-6Al-4V

AU - Peralta, Pedro

AU - Villarreal, T.

AU - Atodaria, I.

AU - Chattopadhyay, Aditi

N1 - Funding Information: This work was funded by the Multi-University Research Initiative project on Structural Health Monitoring at ASU, under AFOSR Grant FA95550-06-1-0309 , David Stargel, program manager. Dallas Kingsbury (ASU) is thanked for his help with fatigue testing.

PY - 2012/1

Y1 - 2012/1

N2 - Correlations among microstructure, crack-tip fields and fatigue fracture are studied in beta-annealed Ti-6Al-4V. By means of digital image correlation, the area integral of the opening strain (int) over the cyclic plastic zone was obtained, which was proportional to ΔKm, where m is the Paris exponent, so that da/dN ∝ int. Analysis shows that m≅2(2+(1+n′)-1) where n′ is the cyclic hardening exponent (0 ≤ n′ ≤ 1). This predicts 5 ≤ m ≤ 6, in agreement with experiments, and strongly suggests that fatigue fracture of beta-annealed Ti-6Al-4V can be described using non-local strain parameters.

AB - Correlations among microstructure, crack-tip fields and fatigue fracture are studied in beta-annealed Ti-6Al-4V. By means of digital image correlation, the area integral of the opening strain (int) over the cyclic plastic zone was obtained, which was proportional to ΔKm, where m is the Paris exponent, so that da/dN ∝ int. Analysis shows that m≅2(2+(1+n′)-1) where n′ is the cyclic hardening exponent (0 ≤ n′ ≤ 1). This predicts 5 ≤ m ≤ 6, in agreement with experiments, and strongly suggests that fatigue fracture of beta-annealed Ti-6Al-4V can be described using non-local strain parameters.

KW - Fatigue

KW - Fracture

KW - Microstructure

KW - Plasticity

KW - Titanium alloys

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ER -

Mechanical length scales and their link to fatigue crack growth kinetics in beta-annealed Ti-6Al-4V

Abstract

Keywords

ASJC Scopus subject areas

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