Development of Two New Methods for Estimating Fracture Stress of Fractured Hard or Brittle Materials from Its Fragments (特集 硬質材料) Development of Two New Methods for Estimating Fracture Stress of Fractured Hard or Brittle Materials from Its Fragments

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In the previous studies on the room temperature transverse-rupture strength or fracture stress (σ<SUB>m</SUB>), fracture toughness (K<SUB>IC</SUB>: SEPB method) and fracture origin size (2α) of polycrystalline hard or brittle materials, we have semi-theoretically derived and experimentally verified two equations of σ<SUB>m</SUB>=ψK<SUB>IC</SUB>S<SUB>mf</SUB><SUP>1/2</SUP> and σ<SUB>d</SUB><SUP>-1</SUP> =σ<SUB>0</SUB><SUP>-1</SUP>+Kα<SUP>1/2</SUP>: S<SUB>mf</SUB> is the total fracture surface area of all fragments of one test piece, σ<SUB>d</SUB> is the maximum external stress on the fracture origin, etc..<BR>In this study, based on the above each equation, we newly developed two methods for approximately estimating the fracture stress (σ<SUB>m</SUB>) of the fractured test piece of hard or brittle materials from its fragments, whose fracture load and kind of material are both unknown. Method I: On condition that all the fragments are available, σ<SUB>m</SUB> can be approximately estimated by use of σ<SUB>m</SUB>-S<SUB>mf</SUB><SUP>1/2</SUP> correlation lines with a parameter of K<SUB>IC</SUB> or equation σ<SUB>m</SUB> =ψK<SUB>IC</SUB>S<SUB>mf</SUB><SUP>1/2</SUP> and by measuring S<SUB>mf</SUB> and estimating K<SUB>IC</SUB> from the correlation line between K<SUB>IC</SUB> and K<SUB>IC</SUB><SUP>HV</SUP> (fracture toughness measured by IF method). Method II: On condition that the fragment including the fracture origin is available, σ<SUB>m</SUB> can be approximately estimated by use of σ<SUB>d</SUB><SUP>-1</SUP>-α<SUP>1/2</SUP> correlation lines with a parameter of K<SUB>IC</SUB> and by measuring 2α, etc., and by estimating K<SUB>IC</SUB> in the same way as in Method I.

収録刊行物

  • 粉体および粉末冶金

    粉体および粉末冶金 49(4), 294-298, 2002-04-15

    Japan Society of Powder and Powder Metallurgy

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各種コード

  • NII論文ID(NAID)
    10008222570
  • 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
    6146234
  • 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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