Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Dielectric Breakdown Analysis of Bone-Like Materials with Conductive Channels

전도채널을 갖는 뼈와 유사한 재료의 절연파괴 해석

  • Lee, Bo-Hyun (Dept. of Mechanical Engineering, Inha Univ.) ;
  • Lin, Song (Dept. of Mechanical Engineering, Inha Univ.) ;
  • Beom, Hyeon-Gyu (Dept. of Mechanical Engineering, Inha Univ.)
  • 이보현 (인하대학교 기계공학과) ;
  • ;
  • 범현규 (인하대학교 기계공학과)
  • Received : 2009.12.28
  • Accepted : 2011.03.11
  • Published : 2011.06.01
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Abstract

The dielectric breakdown of bone-like materials subject to purely electric fields is investigated. In general, these materials consist of some layers with stronger dielectric strength and others with weaker dielectric strength in a parallel staggered pattern. The growth of the conductive channel is impeded during penetration of the weaker layer in the bone-like material because the electric-field concentration is relieved. The electric-field distribution around the head of the tubular channel is obtained from finite element analysis. The dielectric strength of the bone-like material is evaluated using the J integral, and some parameters affecting the dielectric strength are determined. It is shown that the J-integral values are reduced with an increase in the breakdown area in the weaker layer. It is also found that the ratio of the permittivity of the weaker layer to that of the stronger layer can strongly affect the dielectric breakdown.

순수한 전기장 하에서의 뼈와 유사한 재료의 절연파괴에 대하여 연구하였다. 일반적으로 뼈와 유사한 재료는 강한 유전강도를 가지는 층과 약한 유전강도를 가지는 층이 서로 평행하게 엇갈려 있는 형태로 구성되어 있다. 뼈와 유사한 재료의 약한 층을 관통하는 전도채널의 성장은 전기장의 집중이 완화되기 때문에 지연된다. 관형채널의 선단에서 전기장의 분포를 유한요소해석을 통해 구하였다. 뼈와 유사한 재료의 절연강도를 J 적분을 사용하여 계산하였고, 절연강도에 영향을 미치는 인자들을 찾아내었다. J 적분은 약한 층에서의 절연파괴 면적이 증가할 수록 작아짐을 보였다. 또한, 약한 층과 강한 층의 유전율의 비가 절연파괴에 큰 영향을 미치는 것으로 나타났다.

Keywords

References

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