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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

SiCw/ZrO2(6mol%Y2O3)陶瓷中晶须增韧的数值模型

宋桂明; 周玉; 林广涌+; 贾德昌; 雷廷权   

  1. 哈尔滨工业大学材料学院; 哈尔滨 150001; +华南理工大学, 广州 510641
  • 收稿日期:1997-10-21 修回日期:1997-12-23 出版日期:1998-10-20 网络出版日期:1998-10-20

A Numerical Model of Whisker Toughening in SiCw/ZrO2(6mol%Y2O3)Ceramics

SONG Gut-Ming; ZHOU Yu; LIN Guang-Yong+; JIA De-Chang; LEI Ting-Quan   

  1. Harbin Institute of Technology Harbin 150001 China; +South China University of Science and Technology Guangzhou 510641 China
  • Received:1997-10-21 Revised:1997-12-23 Published:1998-10-20 Online:1998-10-20

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摘要： SiCw／ZrO2（6mol％Y2O3）陶瓷的实验研究表明，晶须桥联和裂纹偏转是其主要增韧机制在两种机制协同增韧的基础上，建立了晶须增韧的数值模型，对材料的三点弯曲断裂过程的计算结果表明：载荷／位移曲线呈锯齿状，是由于晶须桥联作用使得裂纹扩展与停止这一过程反复出现而引起的；随晶须含量增加，复合材料韧性提高，晶须桥联和裂纹偏转两种增韧贡献都增加，但是占主导地位的增韧机制由裂纹偏转机制逐步过渡到裂纹桥联机制．计算结果与材料的测试结果很吻合．

关键词: 陶瓷复合材料, 晶须韧化, 增韧模型, R－曲线

Abstract: Experimental investigation on whisker toughening in SiCw/ZrO2(6mol%Y2O3) ceramics shows that two main toughening mechanisms, including crack bridging and crack deflection operate simultaneously
during crack propagation. A numerical model of whisker toughening was proposed to estimate the combing toughening contribution from crack
bridging and crack deflection. The calculated results reveal that the load/displacement curve exhibits a zig-zag shape as a result of the repeated crack extension, followed by crack arrest behavior.
With increasing whisker content, both of contributions of crack bridging and crack deflection increase, additionally, the dominant toughening mechanism is gradually changed from crack deflection to crack
bridging. The rationality of the mode was proved with some experimental results.

Key words: ceramic composite, whisker toughening, toughening model, R-curve

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