Acoustic emission spectral analysis of fiber composite failure mechanisms, Volume 2938
Dennis M. Egan, James H. Williams, United States. National Aeronautics and Space Administration, Massachusetts Institute of Technology
National Aeronautics and Space Administration, 1978 - Science - 33 pages
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0.15 Notei Curve 400 BOO FREQUENCY ACOUSTIC EMISSION SPECTRAL AE event normalized AE signals AE sources AE spectral analysis AE spectral energy ANALYSIS OF FIBER BOO Fig boron characterization of AE composite failure mechanisms Composite materials density for 45 discrete frequencies dominant frequencies Egan and James EMISSION SPECTRAL ANALYSIS Energy Density Curves FIBER COMPOSITE FAILURE Fiber fracture fiber polyimide composite fiber polymeric composites fiber volume fraction fracture of matrix graphite fiber polyimide graphite fiber polymeric h Notei individual AE event individual averaged spectra kHz range Mean Normalized Spectral mean square spectral Mehan and Mullin NASA normalized spectral densities normalized spectral energy Notei Curve Notet number of AE Number of individual paired-sample t statistical Performing Organization polyimide composite failure rupture source mechanisms Speake and Curtis spectral energy density spectral energy distribution spectrum of specimen square spectral density Standard Deviation superposed noise system background noise transducer Ultimate Load