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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A.T. Green ACOUSTIC EMISSION SPECTRAL AE event normalized AE signals AE sources AE spectral analysis AE spectral energy ANALYSIS OF FIBER averaged spectra 19 boron characterization of AE Composite Failure Mechanisms density for 45 discrete frequencies dominant frequencies Egan and James Energy Density Curves epoxy FIBER COMPOSITE FAILURE Fiber fracture fiber polyimide composite fiber polymeric composites fiber volume fraction fracture of matrix graphite fiber polyimide graphite fiber polymeric individual AE event individual averaged spectra Integrity Using Acoustic J.V. Mullin kHz range Lewis Research Center Massachusetts Materials and Structures Mean Normalized Spectral mean square spectral Mehan and Mullin Monitoring of Fiber NASA normalized spectral densities normalized spectral energy Notei Curve Number of individual paired-sample t statistical Performing Organization R.L. Mehan source mechanisms Speake and Curtis spectral energy density spectral energy distribution spectrum of specimen square spectral density Standard Deviation Structural Integrity superposed noise system background noise transducer Ultimate Load