Relationship between the cone crack and fracture mode in ceramics under high-velocity-projectile impact

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概要

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• Ceramics will be widely used for enhancing the efficiency of power generating systems, particularly gas turbines. However, ceramics used in these systems suffer damage owing to impact by foreign objects. In this study, various ceramic plates are impacted by a spherical projectile with an impact velocity of 320 m/s. The volume of the cone cracks formed on the plates decreases with an increase in the fracture toughness of the ceramic material. No cone cracks are formed on the zirconia (3Y-TZP) plate because crack formation is prevented by stress-induced phase transformation outside the impacted region. The volume of the cone crack is higher and the energy consumed by surface formation is smaller in transgranular-fractured ceramics than in intergranular-fractured ones. The fracture process can be controlled by controlling the characteristics of the grain boundaries, as well as by stress-induced phase transformation.

• 公益社団法人 日本セラミックス協会の論文

著者

• Sekine Kiyoto

  Mino Ceramic Co. Ltd.

• Tanabe Yasuhiro

  Department of Cardiology, Tokyo Metropolitan Hiroo Hospital

• YAMADA Masayoshi

  Department of Electronics,Faculty of Engineering,Kobe University

• Kumazawa Takeshi

  Mino Ceramic Co., Ltd.

• Kumazawa Takeshi

  Mino Ceramic Co.

• Yamada Masayoshi

  Department Of Electronics Faculty Of Engineering Osaka University

• Tanabe Yasuhiro

  Department Of Cardiology Tokyo Metropolitan Hiroo General Hospital

• Yamada Masayoshi

  Department Of Electronics And Information Science Faculty Of Engineering And Design Kyoto Institute

• TANABE Yasuhiro

  Department of Engineering, Nagoya University

• YAMADA Masayoshi

  Department of Engineering, Nagoya University

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