Metal fatigue crack growth monitoring has been a hot topic in the study of material proper-ties.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 re-sults 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
Key words
materials failure and protection/fatigue crack growth/chaotic characteristic/acoustic emission
维普
万方数据