Wavelet analysis of acoustic emission signals from thermal barrier coatings
(1.湖南省长沙市湖南大学材料科学与工程学院2.湖南省湘潭市湘潭大学材料与光电物理学院3.湖南省湘潭市湘潭大学教育部重点实验室低维材料及应用技术)
Abstract: The wavelet transform is applied to the analysis of acoustic emission signals collected during tensile test of the ZrO2-8% Y2O3 (YSZ) thermal barrier coatings (TBCs). The acoustic emission signals are de-noised using the Daubechies discrete wavelets, and then decomposed into different wavelet levels using the programs developed by the authors. Each level is examined for its specific frequency range. The ratio of energy in different levels to the total energy gives information on the failure modes (coating micro-failures and substrate micro-failures) associated with TBCs system.
Key words: wavelet transform; acoustic emission; tensile test; thermal barrier coatings; failure modes