Effect of stress triaxiality on fracture behavior of 2091 aluminum alloys

Toshiro Kobayashi, Mitsuo Niinomi

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


The toughness of Al-Li system alloy increases in general with lowering temperature. The mechanism of the toughness increase at low temperature has not been, however, clearly defined yet. In this study, the relationship between formation of laminated cracks and stress triaxiality are investigated on 2091 Al-Li system alloys. The number of laminated cracks increases with rising stress triaxiality. The dynamic fracture toughness value Jdincreases at 77 K and exhibits greater value at a thickness, B, of 1 mm. The increasing ratio at 77 K in fracture toughness of specimens with laminated cracks is much greater than that of specimens without laminated cracks. The laminated cracks will lead to the stress relaxation at the main crack tip increase the fracture toughness.

Original languageEnglish
Pages (from-to)654-659
Number of pages6
Journaljournal of japan institute of light metals
Issue number11
Publication statusPublished - 1995


  • Al-Li system alloy
  • fracture toughness
  • laminated cracks
  • stress triaxiality
  • toughening mechanism

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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