摘要
本文书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。
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,filter,main-amplifier and rate-meter. The maximum of acoustic emissioncounts during cooling is approximately 400 times of that during heating,which indicatesthat the initiation and growth of cracks due to thermal stress mainly result from cooling.With decreasing grain size,the propagation of cracks are arrested in smaller area.
出处
《湖南大学学报（自然科学版）》
EI
CAS
CSCD
1994年第2期59-64,共6页
Journal of Hunan University:Natural Sciences
基金
国家自然科学基金
关键词
铝质陶瓷
热应力
裂纹
声发射
alumina ceramic,thermal stress, crack,acoustic emission
