Fatigue crack growth of a Ni-P amorphous alloy thin film

Kazuki Takashima, Masayuki Shimojo, Yakichi Higo, Michael V. Swain

Research output: Contribution to journalConference article

4 Citations (Scopus)

Abstract

Fatigue crack growth behavior has been investigated for micro-sized Ni-P amorphous alloy specimens. Cantilever beam type specimens (10 μm by 12 μm by 50 μm) with notches were prepared from Ni-P amorphous thin film by focused ion beam machining. Fatigue crack growth tests were carried out in air at room temperature using a newly developed mechanical testing machine that can apply cyclic loading to micro-sized specimens. Striations were observed clearly on the fatigue surface, and fatigue crack growth resistance curves as a function of stress intensity range (ΔK) were obtained from careful measurements of the striation spacings. The fatigue crack growth rates at stress ratios of 0.3 and 0.5 were greater than that at 0.1 under a given value of ΔK. This suggests crack closure may occur even in such micro-sized specimens and may affect the fatigue crack growth behavior.

Original languageEnglish
Pages (from-to)52-61
Number of pages10
JournalASTM Special Technical Publication
Issue number1413
Publication statusPublished - 2001 Jan 1
EventMechanical Properties of Structural Films - Orlando, FL, United States
Duration: 2000 Nov 152000 Nov 16

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Keywords

  • Amorphous alloy
  • Bending test
  • Fatigue crack growth
  • Ni-P
  • R ratio
  • Thin film

ASJC Scopus subject areas

  • Engineering(all)

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