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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Abstract

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.

Journal

  • Journal of the Japan Society of Powder and Powder Metallurgy

    Journal of the Japan Society of Powder and Powder Metallurgy 49(4), 294-298, 2002-04-15

    Japan Society of Powder and Powder Metallurgy

References:  13

Codes

  • NII Article ID (NAID)
    10008222570
  • NII NACSIS-CAT ID (NCID)
    AN00222724
  • Text Lang
    ENG
  • Article Type
    ART
  • ISSN
    05328799
  • NDL Article ID
    6146234
  • NDL Source Classification
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL Call No.
    Z17-274
  • Data Source
    CJP  NDL  J-STAGE 
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