Mechanical analysis of toughness degradation due to premature fracture of course inclusions in wrought aluminium alloys

Hiroyuki Toda, Toshiro Kobayashi, Akihiro Takahashi

研究成果: ジャーナルへの寄稿学術誌査読

52 被引用数 (Scopus)

抄録

The present work is aimed at numerical analyses of toughness degradation due to damage evolution at coarse inclusions, with particular interests on microstructural control for toughness enhancement by controlling the damage initiation. The investigation employs a combination of crack-tip singularity and Eshelby internal stress analysis within each inclusion. The essential feature of the model is to predict crack initiation toughness and crack path morphology using a mixed-mode fracture criterion. The procedure accounts a criterion for the damage evolution, effects of a deflected crack-tip, and shielding/antishielding effects due to the damaged inclusions. The toughness is found to be degraded by increasing the grain size of the matrix and the volume fraction of the inclusion, and also by decreasing the fracture strength of the inclusion and hence its coarsening. The effects are remarkably pronounced when the inclusions are agglomerated. Especially, weak inclusions agglomerated on grain boundary act to deflect the crack along the grain boundary even when inferior crack propagation resistance within grain boundary PFZ is not considered. The in-situ fracture strengths of several inclusions are also estimated in the lights of the numerical results.

本文言語英語
ページ(範囲)69-75
ページ数7
ジャーナルMaterials Science and Engineering: A
280
1
DOI
出版ステータス出版済み - 3月 15 2000
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 材料科学一般
  • 凝縮系物理学
  • 材料力学
  • 機械工学

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