Development of a micro-beam method to investigate the fatigue crack growth mechanisms of submicron-scale cracks

Y. Yang, H. H. Ruan, J. Lu, N. Yao, W. L. Shan, W. O. Soboyejo

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

In this paper, we propose a new experimental method to investigate the fatigue crack growth mechanisms of submicron-scale cracks by using freestanding single edge notched micro-beams that are fabricated on the surfaces of conventional bending specimens with the focused ion beam technique. Three dimensional FEM simulations in conjugate with LEFM fracture analysis were carried out to correlate the applied far field stresses with the local crack-tip driving force. For the validation of the new method, micro-beam experiments were conducted on 4340 low alloy steels and the results showed the similar findings compared to those in the literature while revealed undiscovered fatigue damage mechanisms that took place at the submicron and nanometer scales.

Original languageEnglish (US)
Pages (from-to)731-742
Number of pages12
JournalExperimental Mechanics
Volume49
Issue number5
DOIs
StatePublished - Jan 1 2009

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Keywords

  • Fatigue
  • Fatigue tests
  • Focused ion beam (FIB)
  • Steels

ASJC Scopus subject areas

  • Aerospace Engineering
  • Mechanics of Materials
  • Mechanical Engineering

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