Research on acoustic emission characteristics of honeycomb sandwich composite in compression damage

摘要

According to stress damage acoustic emission signal of loading honeycomb sandwich composite, taking the destructive compression test. Analyzing mechanical properties of the honeycomb sandwich composite material compression, establishing the correlation diagram between load and acoustic emission signal; the distribution of each phase signal characteristic parameter is studied with statistics. Taking three times filtering based on each phase signal characteristics. With increasing the load under loading condition, the damage of composite material increases gradually. The whole process can be divided into four stages, the first stage, There is small amount of the acoustic emission signal and the signal is generally low; Secondly, the number of acoustic emission events are relatively small and stable with a small increasing in characterization of signal; Thirdly, acoustic emission events grows suddenly, the average energy released by it increases; Fourthly, there will be arising a large number of signal which characteristic parameter is large. The experimental results show that it is effective to analyze the material damage and its evolution based on the analysis of acoustic emission parameter in compression process. There are coincides between the actual fracture location and the signal distribution obtained after filtering which is based on the characteristics of each phase parameters. The paper can provide reference for damage forecast and health monitoring of honeycomb sandwich composite.