Initiation and propagation behavior of fatigue cracks in 5056 aluminum alloy studied by rotation-bending tests with smooth specimen

Takahiro Shikama, Shinji Yoshihara, Tadashi Aiura, Dongsun Lee, Hiroshi Noguchi

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1 Citation (Scopus)

Abstract

Fatigue properties of 5056 aluminum alloy, which is the most Mg-rich alloy among commercial Al-Mg alloys, and exhibits significant work hardening and strain aging, was investigated. RotationBending tests with smooth specimen were performed at room temperature, with stress ratio R= -1 and frequency of stress cycle f= 55 Hz. The experimental results showed that a clear fatigue limit like in case of a steel existed on the S-N curve. Surface observation with the replica method revealed a wavy pattern around the second phase particle for N= 106-107, but no non-propagation crack were observed. It was speculated that the observed fatigue limit appeared as a result of marked work hardening and strain aging at the heavily deformed zone, and fatigue cracks did not initiate from the zone at up to the maximum number of stress cycle, N= 3.5×107, employed in the present study.

Original languageEnglish
Pages (from-to)928-937
Number of pages10
JournalNihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
Volume76
Issue number767
DOIs
Publication statusPublished - Jul 2010

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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