Effect of a single overload on the cyclic R-curve behaviour of a γ-TiAl TNM alloy

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Organisational units

External Organisational units

  • Erich Schmid Institute of Materials Science
  • MTU Aero Engines AG

Abstract

The effect of single overloads on the threshold of stress intensity range of a semi-brittle material, a γ-titanium aluminide, was analysed. This material class exhibits a pronounced R-curve behaviour, which is mainly caused by the formation of shear ligaments, crack deflection and branching. Samples with short cracks on deep sharp notches were subjected to overloads of 80 % of the fracture toughness. Contrary to ductile materials, the experiments revealed no significant increase in the long-crack threshold, however a pronounced increase in the slope of the R-curve for the threshold of stress intensity range.

Details

Original languageEnglish
Article number107083
Number of pages8
JournalInternational Journal of Fatigue
Volume163.2022
Issue numberOctober
Early online date23 Jun 2022
DOIs
Publication statusPublished - Oct 2022