高温合金基于二次K熵的疲劳扩展声发射特征  

Acoustic Emission Characteristics of Fatigue Propagation of Superalloy Based on Quadratic K-entropy

作　　者：景婷 梁哲铭 于洋[1] JING Ting;LIANG Zheming;YU Yang(School of Information Science and Engineering,Shenyang University of Technology,Shenyang 110870,China;Shenyang Aircraft Design&Research Institute,Shenyang 110035,China)

机构地区：[1]沈阳工业大学信息科学与工程学院,沈阳110870 [2]沈阳飞机设计研究所,沈阳110035

出　　处：《材料研究学报》2024年第7期490-498,共9页Chinese Journal of Materials Research

基　　金：中国航空发动机集团应用创新项目(630010504)。

摘　　要：用高灵敏声发射技术在线监测金属疲劳裂纹的扩展,研究了高温合金基于二次K熵的疲劳扩展声发射特征,提出二次K熵方法并将计算结果作为分析这种不确定性的新参数。研究结果表明,金属疲劳扩展过程中的声发射信号具有混沌特性,对其二次K熵处理结果表明其趋势变化与疲劳裂纹扩展过程有更为清晰的对应关系,且能提前得到更为精确的疲劳断裂信息,提前率达到8%以上,为预测疲劳断裂提供了依据。Metal fatigue crack growth monitoring has been a hot topic in the study of material properties.In this study,high sensitive acoustic emission technology is used to conduct online monitoring of metal fatigue crack growth.A quadratic K-entropy method is proposed for the first time,the calculation results of which are used as a new parameter to analyze this uncertain process.The experimental results indicate that the acoustic emission signal in metal fatigue growth shows chaotic characteristics,and its trend has a clear corresponding relationship with the process of fatigue crack growth after the quadratic K-entropy treatment,and the fatigue fracture information can be obtained in advance.The advance rate is more than 8%of the whole process,which effectively provides a basis for the prediction of fatigue fracture.

关 键 词：材料失效与保护 疲劳裂纹扩展 混沌特性 声发射 

分 类 号：TG113.255[金属学及工艺—物理冶金]