摘要
为探究工程陶瓷边缘碎裂损伤规律与机理,以氧化铝陶瓷的单晶压痕边缘碎裂为平台,应用微机控制电子万能试验机施加载荷,应用声发射设备监测其损伤过程中的声发射信号,建立基于声发射信号参数的灰色-尖点突变理论模型,通过分析损伤过程中的加载特征和声发射信号特征,从损伤演化过程的角度揭示氧化铝陶瓷边缘碎裂的损伤规律。结果表明:氧化铝陶瓷的边缘碎裂是由一系列不连续的突变过程组成,在临界载荷之前,这些突变强度不大,不会对材料性能产生宏观影响;但当外加载荷达到某一临界载荷时,氧化铝陶瓷边缘会瞬间碎裂。应用基于声发射累积计数和累积能量的灰色-尖点突变模型可较好的描述氧化铝陶瓷边缘碎裂损伤演化过程的突变特性。
An experiment system by single indenter is established to study the failure process of edge chipping for Al2O3. In this system,the load-time curves are recorded by the microcomputer controlling pressure-universal test machine,and the AE signals emitting are collected by acoustic emission system,a grey-cusp catastrophe model based on AE parameters is built. Failure regulars of edge chipping for Al2O3 are studied by the characteristics of loading and AE signals. The results show that the failure process of edge chipping for Al2O3are composed of a series of catastrophes,the intensities of catastrophes are small which wouldn’t breakdown the material performances before it reaching a critical loads. While the load gets to a critical value,edge chipping would occur suddenly. The grey-cusp catastrophe model based on accumulated counts and accumulated energies can descript the catastrophe characteristic of Al2O3well.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2014年第4期945-953,共9页
Journal of Synthetic Crystals
基金
国家自然科学基金青年基金(51105378)
装甲兵工程学院创新基金项目(2012CJ073)
关键词
氧化铝陶瓷
边缘碎裂
突变理论
灰色理论
声发射
Al2O3ceramic
edge chipping
catastrophe theory
grey theory
ascoustic emission
