Mechanism of Plastic Flow of Gaskets and Anvils in 6-8 Type Anvils

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In the 6-8 type anvils, the occurrences of blow-out have restricted the attainable pressure to 25 GPa. The cause of blow-out was attributed to the fracture of the cube of the second stage anvils maade made of cemented tungsten carbide (WC). The stress state in the cube was, therefore, calculated by a finite element method. As a result, there was a fracture line in the stress diagram of σ<SUB>0</SUB> vs σ<SUB>m</SUB> that was expressed as σ<SUB>0</SUB>=S<SUB>0</SUB>- (3/2) σ<SUB>m</SUB>, where σ<SUB>0</SUB>, σ<SUB>m</SUB>, and S<SUB>0</SUB> were the equivalent stress of von Mises, the mean normal stress, and half of the compressible strength, respectively. Furthermore, the breakage of pyrophyllite was also proven to follow the same fracture line except for the value of S<SUB>0</SUB>. In Bridgman, anvils the expression of failure stress which derived from our flow model on the basis of the fracture line, accounted for the compressible strength of the various thicknesses of gaskets. The observed plastic deformation of the cube of the second stage anvils would already occur at lower pressures when the σ<SUB>0</SUB> exceeded the parallel fracture line, where the S<SUB>0</SUB> was less than the value at failure.

収録刊行物

  • 高圧力の科学と技術 = The Review of high pressure science and technology  

    高圧力の科学と技術 = The Review of high pressure science and technology 7, 1514-1516, 1998 

    The Japan Society of High Pressure Science and Technology

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各種コード

  • NII論文ID(NAID)
    10002694536
  • NII書誌ID(NCID)
    AN10452913
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    0917639X
  • NDL 記事登録ID
    4494284
  • NDL 雑誌分類
    ZP1(科学技術--化学・化学工業)
  • NDL 請求記号
    Z17-1589
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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