Abstract
This report is the ``FINAL PROGRESS REPORT`` for the research program ``Investigation of Fracture Toughness and Fracture Mechanisms using Acoustic Emission Measurements.`` The time period covered by this report is from 1 March 1988 through August 1991. The research program consisted of three separate but closely related investigations: (1) An Investigation of the Acoustic Emission Generated during the Deformation and Fracture of Premium Grade 4340 Steel as a function of Mechanical Properties. (2) An Investigation of the Acoustic Emission Generated during the Deformation and Fracture of Ti-641-4V Alloys as a Function of Microstructure. (3) An Investigation of the Acoustic Emission Generated from Second Phase Particles in Aluminum-Silicon Alloys as a Function of Second Phase Particle Size and Density. A synopsis of each of the individual investigations including pertinent data and meaningful results will be given in the report. A listing of graduate student involvement, publications and presentations will also be provided.
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