| 铝质陶瓷在热应力下裂纹形成及扩展的声发射表征 |
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| 引用本文： | 杜伟坊,杜海清.铝质陶瓷在热应力下裂纹形成及扩展的声发射表征[J].湖南农业大学学报(自然科学版),1994,21(2). |
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| 作者姓名： | 杜伟坊 杜海清 |
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| 作者单位： | Department of Chemistry and Chemical Engineering，Hunan Univ |
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| 摘 要： | 本文将声发射技术应用于陶瓷材料研究领域，通过由传感器，前置放大器，滤波器，主放大器，信号形成器，时基计数器组成的声发射检测系统，精确地测定了陶瓷材料在热应力作用下裂纹生长，扩展的动态过程；发现陶瓷材料在冷却过程中声发射计数率的峰值约为加热过程的４００倍，陶瓷材料在热应力下微裂纹的形成，生长主要发生在冷却过程中；当晶粒尺寸减小时，材料的微裂纹扩展，蔓延逐渐被抑制在较小的范围内。
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| 关 键 词： | 铝质陶瓷 热应力 裂纹 声发射 |
Acoustic Emission Expression of Initiation and Growth of Crack in Alumina Ceramic Due to Thermal Stress |
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| Du Weifang Du Haiqing.Acoustic Emission Expression of Initiation and Growth of Crack in Alumina Ceramic Due to Thermal Stress[J].Journal of Hunan Agricultural University,1994,21(2). |
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| Authors: | Du Weifang Du Haiqing |
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| Abstract: | The acoustic emission technique was used for the study of ceramics inthis work.The dynamic process of crack growth in ceramics under thermal stress wastested accurately by a acoustic emission testing system which consisted of transducer,pre-amplifier,filt |
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| Keywords: | alumina ceramic thermal stress crack acoustic emission |
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