Effect of prestrain on fatigue crack growth of age-hardened Al 6061-T6

Kóji Ikematsu, Takuhiro Mishima, Minwoo Kang, Yuuta Aono, Hiroshi Noguchi

Research output: Contribution to journalArticle

Abstract

The effect of prestrain on fatigue crack growth characteristic (FCGC) of age-hardened Al 6061-T6 was investigated. Al 6061-T6 specimens were subjected to tension to produce plastic strain. Extruded bars were prepared to investigate FCGC. Specimens with an artificial hole from the bar were used to observe Mode I fatigue crack. On the other hand, coarse-grained plain specimens were used and observed for Mode II fatigue crack. Fatigue tests were performed under a rotating bending load (R=-1). The experimental results showed the Mode I fatigue crack growth rates decelerated a little due to prestrain. However, in the case of Mode II, fatigue crack growth rates of prestrain specimens accelerated about ten times due to prestrain. The Mode II fatigue crack easily propagates on the slip bands, because precipitation particles on the slip bands are sheared by prestrain. The result means the influence of prestrain on Mode II fatigue should be taken into account for damage-tolerant design.

Original languageEnglish
JournalJournal of ASTM International
Volume5
Issue number8
DOIs
Publication statusPublished - Sep 1 2008

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Fatigue crack propagation
Fatigue
Growth
Fatigue of materials
Plastic deformation
Fatigue cracks
Plastics

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Materials Science(all)
  • Nuclear Energy and Engineering
  • Environmental Engineering
  • Public Health, Environmental and Occupational Health

Cite this

Effect of prestrain on fatigue crack growth of age-hardened Al 6061-T6. / Ikematsu, Kóji; Mishima, Takuhiro; Kang, Minwoo; Aono, Yuuta; Noguchi, Hiroshi.

In: Journal of ASTM International, Vol. 5, No. 8, 01.09.2008.

Research output: Contribution to journalArticle

Ikematsu, Kóji ; Mishima, Takuhiro ; Kang, Minwoo ; Aono, Yuuta ; Noguchi, Hiroshi. / Effect of prestrain on fatigue crack growth of age-hardened Al 6061-T6. In: Journal of ASTM International. 2008 ; Vol. 5, No. 8.
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