X-ray microtomography of fatigue crack closure as a function of applied load in Al-Li 2090 T8E41 samples

R. Morano*, S. R. Stock, G. R. Davis, J. C. Elliott

*Corresponding author for this work

Research output: Contribution to journalConference article

14 Scopus citations

Abstract

Crack closure is held to be responsible for very low fatigue crack growth rates in many alloys such as Al-Li 2090 T8E41, and early crack face contact during unloading or prolonged contact during loading seems to reduce the driving 'force' for crack extension. High resolution x-ray computed tomography (i.e., microtomography) allows one to image the entire volumes of samples and to quantify opening as a function of applied load over the entire crack surface. Crack closure results are reported for a fatigue crack grown under load ratio R=0.1 in a compact tension sample of Al-Li 2090 T8E41; the crack was free to choose its path unconstrained by side-grooves which are normally used to suppress crack deflection. The inter-relationship between crack path, crack face contact and applied load level are discussed.

Original languageEnglish (US)
Pages (from-to)31-35
Number of pages5
JournalMaterials Research Society Symposium - Proceedings
Volume591
StatePublished - Dec 3 2000
EventThe 1999 MRS Fall Meeting - Symposium S 'Nondestructive Methods for Materials Characterization' - Boston, MA, USA
Duration: Nov 29 1999Nov 30 1999

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ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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