Thermal Stress Characteristics of a Functionally Graded ZnO Element with High Energy Absorption Capability

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  • Itoh Yoshiyasu
    Power & Industrial Systems Research & Development Center, Toshiba Corporation
  • Suzuki Hironori
    Power & Industrial Systems Research & Development Center, Toshiba Corporation
  • Andoh Hideyasu
    Power & Industrial Systems Research & Development Center, Toshiba Corporation

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  • 高エネルギー吸収特性を有する傾斜機能ZnO素子の熱応力特性
  • コウエネルギー キュウシュウ トクセイ オ ユウスル ケイシャ キノウ ZnO ソシ ノ ネツ オウリョク トクセイ

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Abstract

The thermal stress characteristics of a zinc-oxide(ZnO) nonlinear element were studied in case of the ZnO element subjected to the partial heating during electrifying. The thermal stress analysis results indicate that the maximum thermal stress at the surface of the disk-shaped ZnO element was reduced when the edge of the element was heated. Moreover, it was made clear that the maximum thermal stress at the surface of the ZnO element was reduced by using a graded heating profile at the edge of the element.<BR>From the point of view of thermal stress reduction, a functionally graded zinc-oxide(ZnO) nonlinear element with a high surge energy absorption capability was developed for the first time in this study. Namely, graded electric-resistivity at the egde of the disk-shaped ZnO element could be realized by controlling the zinc-oxide grain growth. As a result, high surge energy absorption capability of the functionally graded ZnO element could be confirmed by comparing with a conventional ring heating type element.

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