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Device Development for the Analysis of Non-equiliblium Fracture of Ceramic Composites under Ultra Severe Condition

Research Project

Project/Area Number 08555158
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section展開研究
Research Field Composite materials/Physical properties
Research InstitutionTOKYO INSTITUTE OF TECHNOLOGY

Principal Investigator

YASUDA Eiichi  Tokyo Institute of Technology, Materials and Structures Lab.Professor, 応用セラミック研究所, 教授 (70016830)

Co-Investigator(Kenkyū-buntansha) YANO Toyohiko  Tokyo Institute of Technology, Research Laboratory for Nuclear Reactors Associat, 原子炉工学研究所, 助教授 (80158039)
AKATSU Takashi  Tokyo Institute of Technology, Materials and Structures Lab.Associate, 応用セラミックス研究所, 助手 (40231807)
TANABE Yasuhiro  Tokyo Institute of Technology, Materials and Structures Lab.Associate Professor, 応用セラミックス研究所, 助教授 (70163607)
小笠原 俊夫  日産自動車(株), 宇宙航空事業部, 上級技師
Project Period (FY) 1996 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥17,900,000 (Direct Cost: ¥17,900,000)
Fiscal Year 1998: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1997: ¥8,300,000 (Direct Cost: ¥8,300,000)
Fiscal Year 1996: ¥8,700,000 (Direct Cost: ¥8,700,000)
KeywordsCeramics / Composite / Crack extension resistance / Work-of-fracture / Bending strength / 高温破壊靱性 / R曲線挙動 / セラミック基複合材料 / 亀裂進展挙動 / 曲げ試験 / 繊維架橋 / 亀裂先端閉口応力
Research Abstract

The bending strength and the work-of-fracture of polycrystalline Al2O3 and one reinforced with SiC whiskers were measured at elevated temperatures using an equipment developed in this study. Four-point bend test with an inner span of 10mm and an outer span of 30mm was carried out for a beam with a dimension of 3 * 4 * 36mm3 in order to estimate the bending strength. For the estimation of the work-of-fracture, 3-point bending with a span of 30mm was done against the beam with a chevron notch at its center. Remarkable plastic deformation was not observed in each material from room temperature to 1200。C, so that linear fracture mechanics could be applied to analyze the mechanical properties measured.
There was almost no change in the work-of-fracture of the polycrystalline Al2O3, which was 20J/m2. On the contrary, the work-of-fracture of the composite increased with increasing temperature from about 50J/m2 at room temperature up to the maximum of 120J/m2 at 1100。C.
This was caused by the re … More laxation of residual thermal stresses which was due to thermal expansion mismatch between Al2O3 and SiC, and was leaded the increase in the number as well as the pull-out length of bridging whiskers. The rationality of the argument was supported by the result of model calculation in which both frictional and pull-out bridging of whiskers were considered, and by the observation of pulled-out whiskers on a fractured surface.
The bending strength of polycrystalline Al2O3 was constant (about 450MPa) below 1000。C, and gradually decreased with increasing temperature from 1200。C.On the contrary, the bending strength of the composite did not change from room temperature to 900。C, and steeply decreased from about 400MPa to about 300MPa at 1000。C.The bending strengths changed with correspond to the change in crack extension resistance, because it was experimentally confirmed that there was no crack healing and macroscopic plastic deformation in both materials below 1200。C.
The significant decrease in the bending strength of the composite at 1000。C was caused by the decrease of crack closure stress owing to the relaxation of compressive residual thermal stress around whiskers which bridged natural flaws at room temperature. Less

Report

(4 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • 1996 Annual Research Report
  • Research Products

    (19 results)

All Other

All Publications (19 results)

  • [Publications] 赤津隆、 田邊靖博、 安田榮一: "亀裂面架橋で高靱性化したセラミックスの破壊靱性値と破壊エネルギーに及ぼす不可逆的エネルギー散逸の影響" Journal of the Ceramic Society of Japan. 106[4]. 390-395 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] AKATSU, T and YASUDA, E: "The Effect of Interfacial Friction Stress on the Work-of-fracture of a Whisker-reinforced Ceramic Composite" Ceramic Transactions Ceramic Material Systems with Composite Structures. 99. 295-310 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T.Akatsu, M.Ohshima, Y.Tanabe, E.Yasuda, S.Yamada and T.Yano: "Work-of-fracture of SiC-Whisker Reinforced AI203 Composite at Elevated Temperatures" Science and Engineering of Composite Materials. 7[3]. 231-238 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T.Akatsu, Y.Tanabe and E.Yasuda: "Effect of Irreversible Energy Loss on the Fracture Toughness and the Work-of-Fracture of Ceramics Toughened by Crack Face Bridging" Journal of the Ceramic Society of Japan. 106[4]. 390-395 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T.Akatsu and E.Yasuda: "The Effect of Interfacial Friction Stress on the Work-of-fracture of a Whisker-reinforced Ceramic Composite" Ceramic Transactions, Ceramic Material Systems with Composite Structures. 99. 295-310 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T.Akatsu, M.Ohshima, Y.Tanabe, E.Yasuda, S.Yamada and T.Yano: "Work-of-fracture of SiC-Whisker Reinforced Al203 Composite at Elevated Temperatures" Science and Engineering of Composite Materials. 7[3]. 231-238 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 赤津隆,田邊靖博,安田榮一: "亀裂面架橋で高靭性化したセラミックスの破壊靭性値と破壊エネルギーに及ぼす不可逆的エネルギー散逸の影響" Journal of the Ceramic Society of Japan. 106[4]. 390-395 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] AKATSU,T.and -YASUDA,E: "The Effect of Interfacial Friction Stress on the Work-of-fracture of a whisker-reinforced Ceramic Composite" Ceramic Transactions Ceramic Material Systems with Composite Structures. 99. 295-310 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] T.Akatsu,M.Ohshima,Y.Tanabe,E.Yasuda,S.Yamada and T.Yano: "Work-of-fracture of Sic-Whisker Reinforced Al_2O_3 Composite at Elevated Temperatures" Science and Engineering of Composite Materials. 7[3]. 231-238 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] E.YASUDA T.AKATSU, et. al.: "Mechanical Properties of SiC Whisker/Si_3N_4 Composite Prepared by an In -situ Method" Proc. of Engineering Ceramics'96. 239-249 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Y.YOON, T.AKATSU, et. al.: "Anisotrophy of Creep Deformation Rate in Hot-pressed Si_3N_4 with Preferred Orientation of the Elongated Grains" Journal of Materials Science. 32. 3813-3819 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] S.WANG, EYASUDA et. al.: "Intergranular Precipitation Y_3Al_5O_<12>/ MgAl_2O_4 System" Journal of Materials Science Letters. 16. 1580-1583 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] S.WANG, Y.TANABE, et. al.: "Eutectic Precipitation of the Spinel Solid Solution-Yttrium Aluminum Garnet (YAG) System" J. Am. Ceram. Soc.81[1]. 263-265 (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] Y.TANABE,E.YASUDA,et.al.: "The Measurement of Fracture Toughness and Work-of-Fracture of Ceramics Using the JIS-Type Bending Beam with a Chevron Notch" Journal of the Ceramic Society of Japan,Int.Edition. 104. 612-621 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] T.AKATSU and E.YASUDA: "The Effect of Interfacial Chemical Reaction on the Mechanical Properties of Si_3N_4 Whisker/Al_2O_3 Compositite" Journal of the Ceramic Society of Japan. 104[11]. 1019-1024 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] E.YASUDA,M.SAKAI,et.al.: "Fracture Toughness and Work-of-Fracture of Toughened Brittle Materials in Chevron Notch Geometry" Fracture Mechanics of Ceramics. 11. 245-260 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] X.Tong,T.Yano et.al.: "Sintering Behavior of TiC Reinforced SiC Composites Doped with Ti and C" J.Ceramic Society of Japan. 104[7]. 594-598 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] J.Y.Kim,T.Yano et.al.: "Pressur eless Sintering of Dense Si_3N4 and Si_3N_4/SiC Composites with Nitr ate Additives" J.Am.Caram.Soc.79[10]. 2744-2746 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] J.Y.Kim,矢野豊彦 他: "硝酸塩を焼結助剤としたSi_3N_4およびSi_3N_4/SiC複合材の常圧焼結" J.Ceram.Soc.Jpn.105[2]. 147-151 (1997)

    • Related Report
      1996 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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