σ_m=ΨK_<IC>S_<mf>^<1/2>式と到達可能強度推定法のMn-Znフェライトへの適用の可否 Applicabilities of Equation of σ_m=ΨK_<IC>S_<mf>^<1/2> and Estimation Method of Attainable Strength to Mn-Zn Ferrite

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In order to clarify whether our theoretically derived equation of σm=ΨKicSmf<SUP>1/2</SUP>(σm; three-points bending fracture strength, Ψ shape factor, K<SUB>IC</SUB>; fracture toughness, S<SUB>mf</SUB>; total macroscopic area of fracture surface) can be applied to brittle materials having considerably lower K<SUB>IC</SUB> and σm than those of WC-10mass%Co cemented carbide, etc., the relation among σm, K<SUB>IC</SUB> and S<SUB>mf</SUB> was investigated for Mn-Zn ferrite (K<SUB>IC</SUB>; 1.3MPa.m<SUP>1/2</SUP>, the mean value of σm; 0.18GPa) as an example. In addition, the applicability of equation of σo=σd{1+2(a/ρ)<SUP>1/2</SUP>} or σ0<SUP>-1</SUP>=σ0<SUP>-1</SUP>+2σ0<SUP>-1</SUP>ρ<SUP>-1/2</SUP> a<SUP>1/2</SUP>, i.e., the applicability of the estimation method of attainable strength (σ<SUB>a</SUB>; σ<SUB>d</SUB> or σ<SUB>m</SUB> at 2a=mean grain size) to Mn-Zn ferrite was also investigated {σo; ideal bending fracture strength, i.e., the strength which is assumed to be obtained when the length (2a) of longer axis of fracture source becomes imaginarily zero, although the actual attainable minimum value of 2a is the mean grain size of the materials, σ<SUB>d</SUB>; external stress which operated on the fracture source at the moment of fracture, ρ; effective curvature-radius of the edge of fracture source}.<BR>The results obtained were as follows: (1) The linear correlation was found between σm and Smf<SUP>1/2</SUP>, in a similar way to the cemented carbide, etc., which indicates that the equation of σm=ΨK<SUB>IC</SUB>S<SUB>mf</SUB><SUP>1/2</SUP>is also applicable to the ferrite or brittle materials with considerably low K<SUB>IC</SUB> and σ<SUB>m</SUB>. The ratio of the slopes of two regression lines of the ferrite and the cemented carbide coincided well with the ratio of the measured K<SUB>IC</SUB> values of both materials. This indicates that the Vvalue in equation ofσ<SUB>m</SUB>=ΨK<SUB>IC</SUB>S<SUB>mf</SUB><SUP>1/2</SUP> of this ferrite was nearly equal to that of the cemented carbide; the ψ values of both materials were about 15×10<SUP>3</SUP>m<SUP>-3/2</SUP>. (2)The equation of σ<SUB>d</SUB><SUP>-1</SUP>=σ<SUB>0</SUB><SUP>-1</SUP>+2σ<SUB>0</SUB><SUP>-1</SUP>+2σ<SUB>0</SUB><SUP>-1</SUP>ρ<SUP>-1/2</SUP>a<SUP>1/2</SUP> also held for the ferrite. The σ<SUB>a</SUB> of this material was estimated to be about 0.26GPa, which was about 44% higher than the measured mean value of σm (0.18GPa).

収録刊行物

  • 粉体および粉末冶金  

    粉体および粉末冶金 45(6), 529-534, 1998-06-15 

    Japan Society of Powder and Powder Metallurgy

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各種コード

  • NII論文ID(NAID)
    10002052209
  • NII書誌ID(NCID)
    AN00222724
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    05328799
  • NDL 記事登録ID
    4502276
  • 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  CJP引用  NDL  J-STAGE 
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