| STUDY ON THE THRESHOLD VALUE OF CERAMIC MICROCRACK PROPAGATION |
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| 引用本文： | 宋显辉,郑兆佳. STUDY ON THE THRESHOLD VALUE OF CERAMIC MICROCRACK PROPAGATION[J]. 武汉理工大学学报(材料科学英文版), 1994, 0(3) |
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| 作者姓名： | 宋显辉 郑兆佳 |
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| 作者单位： | Song Xianhui Zheng ZhaojiaCentre for Materials Research and Analysis，Wuhan Universityof Technology，Wuhan，430070，P. R. China |
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| 摘 要： | The fatigue behavior of alumina and silicon car-bide has been investigated in this paper.Once visiable macrocrack on ceramic materials appears,the specimen ruptures due tothe high speed of crack propagation and small ultimate strain.It is indicated that the bending fatigue,limit is equal tothreshod value of surface micro crack propagation and is deter-mined by the original defects and grain boundary force of mate-rials.For ceramic materials,the crack growth is controlled bythe applied stress.By measuring the macroscopic residualstrength,we can determine whether the micro-crack is expand-ing and calculate the growth rate of mico-crack.
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STUDY ON THE THRESHOLD VALUE OF CERAMIC MICROCRACK PROPAGATION |
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| Song Xianhui Zheng ZhaojiaCentre for Materials Research and Analysis,Wuhan Universityof Technology,Wuhan,,P. R. China. STUDY ON THE THRESHOLD VALUE OF CERAMIC MICROCRACK PROPAGATION[J]. Journal of Wuhan University of Technology. Materials Science Edition, 1994, 0(3) |
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| Authors: | Song Xianhui Zheng ZhaojiaCentre for Materials Research Analysis Wuhan Universityof Technology Wuhan P. R. China |
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| Affiliation: | Song Xianhui Zheng ZhaojiaCentre for Materials Research and Analysis,Wuhan Universityof Technology,Wuhan,430070,P. R. China |
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| Abstract: | The fat;igue, behavior of alumina and silicon car-bide has been investigated in this paper. Once visiable macro crack on ceramic materials appears,the specimen ruptures due to the high speed of crack propagation and small ultimate strain. It is indicated that the bending fatigue limit is equal to the threshod value of surface micro crack propagation and is deter-mined by the original defects and grain boundary force of mate-rials. For ceramic materials, the crack grmuth is controlled by the applied stress. By measuring the macroscopic residual strength,we can determine whether the micro-crack is expand-ing and calculate the growth rate of micro-crack. |
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| Keywords: | engineering ceramic fatigue Limit crack propagation |
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