(Received 11 November 2007; accepted 8 July 2008)
Published Online: 07 August 2008
CODEN: JAIOAD
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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.
Author Information:
Ikematsu, Koji
Department of Mechanical Engineering Science, Kyushu University, Nishi-ku, Fukuoka
Mishima, Takuhiro
Department of Mechanical Engineering Science, Kyushu University, Nishi-ku, Fukuoka
Kang, Minwoo
Department of Mechanical Engineering Science, Kyushu University, Nishi-ku, Fukuoka
Aono, Yuuta
Department of Mechanical Engineering Science, Kyushu University, Nishi-ku, Fukuoka
Noguchi, Hiroshi
Department of Mechanical Engineering Science, Kyushu University, Nishi-ku, Fukuoka
Stock #: JAI101549
ISSN:1546-962X
DOI: 10.1520/JAI101549
Author