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

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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)


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
Title of host publicationFatigue and Fracture Mechanics
Subtitle of host publication36th Volume
PublisherAmerican Society for Testing and Materials
Number of pages13
ISBN (Print)9780803134164
Publication statusPublished - 2009
Event36th ASTM National Symposium on Fatigue and Fracture Mechanics - Tampa, FL, United States
Duration: Nov 14 2007Nov 16 2007

Publication series

NameASTM Special Technical Publication
Volume1508 STP
ISSN (Print)0066-0558


Other36th ASTM National Symposium on Fatigue and Fracture Mechanics
Country/TerritoryUnited States
CityTampa, FL

All Science Journal Classification (ASJC) codes

  • General Materials Science


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