Application of an Equation Representing Reciprocal Fracture Strength versus Square Root of Fracture Origin Size to the Estimation of Fracture Toughness of Hard or Brittle Materials (特集 硬質材料)
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概要
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In the past study on the transverse-rupture strength (σ<SUB>m</SUB>) of WC-10mass%Co hardmetal, the authors had derived an equation of σ<SUB>d</SUB><SUP>-1</SUP>=σ<SUB>0</SUB><SUP>-1</SUP>+Kα<SUP>1/2</SUP> (σ<SUB>d</SUB>; the external stress which operated on the fracture origin at the moment of fracture, σ<SUB>0</SUB>; the intrinsic fracture strength, K; 2σ<SUB>0</SUB><SUP>-1</SUP>ρ<SUP>-1/2</SUP>, ρ; the effective tip radius of microstructural defect which acted as the fracture origin, a; the half of the major-axis length of the fracture origin), and also had clarified that this equation holds on various kinds of hard materials. Furthermore, the slope value (K) of the σ<SUB>d</SUB><SUP>-1</SUP>-α<SUP>1/2</SUP> regression line was suggested to have a correlation with the fracture toughness (K<SUB>IC</SUB>) in a similar way as the slope of σ<SUB>m</SUB>-S<SUB>mf</SUB><SUP>1/2</SUP> regression line (S<SUB>mf</SUB>; total macroscopic fracture surface area of fragments). In this study, this suggestion was investigated on four kinds of hard or brittle materials such as high speed steel, WC-10mass%Co hardmetal, Si<SUB>3</SUB>N<SUB>4</SUB> ceramics and Mn-Zn ferrite. It was found that the K has surely a strong correlation with K<SUB>IC</SUB>, and K<SUB>IC</SUB> can be expressed by an unified equation of K<SUB>IC</SUB>??0.7K<SUP>-1</SUP>.
- 社団法人 粉体粉末冶金協会の論文
- 2000-05-15
著者
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HAYASHI Koji
Institute of Industrial Science, The University of Tokyo
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Yanaba Yutaka
Institute Of Industrial Science
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Hayashi Koji
Institute Of Industrial Science
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