Effect of fiber orientation in uni-directional glass epoxy laminate using acoustic emission monitoring
来源期刊：Acta Metallurgica Sinica2011年第5期
论文作者：V.Arumugam S.Barath Kumar C.Santulli A.Joseph Stanley
文章页码：351 - 364
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 dam-age 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 investi-gated 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） anal-ysis. 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.
V.Arumugam1，S.Barath Kumar1，C.Santulli2，A.Joseph Stanley3
1. Department of Aerospace Engineering,Anna University2. Department of Chemical Engineering,Materials and Environment,Università La Sapienza3. MIT Campus,Anna University
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 dam-age 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 investi-gated 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） anal-ysis. 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.
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