Effect of fiber orientation in uni-directional glass epoxy laminate using acoustic emission monitoring

作     者：V.Arumugam S.Barath Kumar C.Santulli A.Joseph Stanley 

作者机构：Department of Aerospace EngineeringAnna University Department of Chemical EngineeringMaterials and EnvironmentUniversità La Sapienza MIT CampusAnna University 

出 版 物：《Acta Metallurgica Sinica(English Letters)》 (金属学报（英文版）)

年 卷 期：2011年第24卷第5期

页      面：351-364页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

主　　题：Composite materials Failure mechanisms Acoustic emissionFFT analysis STFFT analysis 

摘      要：Acoustic emission （AE） can be used for in situ structural health monitoring of the composite laminates. One of the main issues of AE is to characterize different damage mechanisms from the detected AE signals. In the present work, pure resin and GFRP composites laminates with different stacking sequences such as 0°, 90°, angle ply[±45°], cross-ply [0°/90°] are used to trigger different failure mechanisms when subjected to tensile test with AE monitoring. The study of failure mechanisms is facilitated by the choice of different oriented specimens in which one or two such mechanisms predominate. Range of peak frequencies in each orientation is investigated using FFT analysis. Fast Fourier Transform （FFT） enabled calculating the frequency content of each damage mechanism. Randomly selected hits from each range of peak frequencies for the specimens with different orientations subjected to tensile test with AE monitoring are analyzed using short time FFT （STFFT） analysis. STFFT analysis is used to highlight the possible failure mechanism associated with each signal. The predominance of failure modes in each orientation is useful in the study of discrimination of failure modes in composite laminates from AE data.