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

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

研究成果: Contribution to journalArticle査読

抄録

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.

本文言語英語
ジャーナルJournal of ASTM International
5
8
DOI
出版ステータス出版済み - 9 1 2008

All Science Journal Classification (ASJC) codes

  • 工学(全般)
  • 材料科学(全般)
  • 原子力エネルギーおよび原子力工学
  • 環境工学
  • 公衆衛生学、環境および労働衛生

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