8 Citations (Scopus)

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.

Original languageEnglish (US)
Pages (from-to)13-16
Number of pages4
JournalScripta Materialia
Volume66
Issue number1
DOIs
StatePublished - Jan 2012

Fingerprint

Growth kinetics
Fatigue crack propagation
cracks
Fatigue of materials
exponents
crack tips
kinetics
Crack tips
hardening
Hardening
plastics
Plastics
microstructure
Microstructure
Experiments

Keywords

  • Fatigue
  • Fracture
  • Microstructure
  • Plasticity
  • Titanium alloys

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Mechanical length scales and their link to fatigue crack growth kinetics in beta-annealed Ti-6Al-4V. / Peralta, Pedro; Villarreal, T.; Atodaria, I.; Chattopadhyay, Aditi.

In: Scripta Materialia, Vol. 66, No. 1, 01.2012, p. 13-16.

Research output: Contribution to journalArticle

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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.",
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AU - Peralta, Pedro

AU - Villarreal, T.

AU - Atodaria, I.

AU - Chattopadhyay, Aditi

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.

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KW - Plasticity

KW - Titanium alloys

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