Applicability of New K_<IC> Estimation Method Using Equation σ_m=ψK_<IC>S_<mf>^<1/2> for Hard or Brittle Materials to Ductile Hot Tool Alloy Steels

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In the previous studies on the fracture of hard or brittle materials such as hardmetals, cermets, ceramics and glass whose un-notched test piece fractures to several fragments, we have semi-theoretically derived and experimentally verified a new equation which correlates the total macroscopic fracture surface area (S<SUB>mf</SUB>) of all fragments of each un-notched test piece and its transverse-rupture strength (σ<SUB>m</SUB>) with the fracture toughness (K<SUB>IC</SUB>) of the material: σ<SUB>m</SUB>=ΨK<SUB>IC</SUB>S<SUB>mf</SUB><SUP>1/2</SUP>. Here, Ψ is a factor including test piece size and test method, etc., and the value of Ψ was clarified to hardly depend on the kind of materials.<BR>In this study, we investigated whether this equation can be applied to ductile hot tool alloy steels which have extremely higher KIC and fracture not to several fragments, but to only two fragments even in the case of un-notched test piece, differing from the above hard or brittle materials. As the result, it was concluded that the equation substantially can be applied also to such ductile steels if a sharply notched test piece showing a brittle fracture mode is used.

収録刊行物

  • 粉体および粉末冶金

    粉体および粉末冶金 51(7), 499-503, 2004-07-15

    一般社団法人 粉体粉末冶金協会

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各種コード

  • NII論文ID(NAID)
    10013343748
  • NII書誌ID(NCID)
    AN00222724
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    05328799
  • NDL 記事登録ID
    7047216
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z17-274
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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