Estimation of Microscopic Fracture Surface Area and Formation Energy of Fracture Surface of WC-Co Cemented Carbide by Using Optical and Atomic Force Microscopes.
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- Yanaba Yutaka
- Institute of Industrial Science, The University of Tokyo
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- Hayashi Koji
- Institute of Industrial Science, The University of Tokyo
Bibliographic Information
- Other Title
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- 光学および原子間力顕微鏡によるWC‐Co超硬合金破面のミクロ的面積と破面形成エネルギーの見積り
- コウガク オヨビ ゲンシカンリョク ケンビキョウ ニヨル WC Co チョウコ
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Abstract
The heights of bending fracture surface of WC-10mass%Co cemented carbide were measured by using OM (optical microscope) and AFM (atomic force microscope) in order to estimate the one-dimensional roughness of the surface (RO and RA, respectively) and then the microscopic fracture surface area (Sif) and Sif/Smf term in our proposed equation of σm= ?? KICSmf1/2 (Smf ; macroscopic fracture surface area of one test piece, σm ; flexural strength, ?? ; shape factor including the ratio of Sif or true fracture surface area (Sif) to Smf, KIC; fracture toughness). Next, the value of γ+P (formation energy of fracture surface, γ; specific surface energy, P; specific plastic deformation work) in the prior equation of Vσm2/18E=(γ+P)Sif+Ek (V; volume of specimen, on which stress operates, E; Young's modulus, Ek; kinetic energy of flying fragments) was evaluated The results obtained were as follows;<BR>1)The RO and RA were 1.27 and 1.43, respectively, and thus, ?? and Sif/Smf were calculated to be 317mm2 and 3.30, respectively.<BR>2)The value of γ+P was estimated to be 6.7×10-4J/mm2.<BR>3)The physical rationality of the equation of σm= ?? KICSmf1/2 should be examined furthermore by investigating the correctness of this value of γ+P or Sif and also the dissipatoin energy by vibration accompanied by crack propagation.
Journal
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- Journal of the Japan Society of Powder and Powder Metallurgy
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Journal of the Japan Society of Powder and Powder Metallurgy 44 (3), 263-268, 1997
Japan Society of Powder and Powder Metallurgy
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Details 詳細情報について
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- CRID
- 1390001206309450624
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- NII Article ID
- 10002013675
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- NII Book ID
- AN00222724
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- ISSN
- 18809014
- 05328799
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- NDL BIB ID
- 4172711
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed