Acoustic emission during unloading of elastically stressed magnesium alloy, Volume 2840
Samson S. Lee, James H. Williams, United States. National Aeronautics and Space Administration, Massachusetts Institute of Technology
National Aeronautics and Space Administration, 1977 - Acoustic emission - 17 pages
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acoustic emission monitoring AE activity AE monitoring equipment AE monitoring system AE/elastic stress constitutive analytical expression average unloading stress corre corresponding to point Cumulative AE counts cumulative unloading AE cycle-independent cycles was recorded data represented defined delay was recorded elastic constitutive parameter elastic stress equation Kaiser effect LEAST SQUARES left completely unloaded level was decreased load and tension loaded to point loading AE loading and unloading loading apparatus loading cycles loading pattern loading-unloading cycle magnesium alloy material constitutive parameter material parameter maximum stress MN/m sec monitoring of elastic NASA NUMBER observe the Kaiser Performing Organization point along line prior to unloading quasi-statically cycled Report required before AE resulting AE Security Classif slope specimen was loaded spond standards for AE straight line stress constitutive relations stress increment stress levels Curve subsequently the data tensile stress testing Unclassified unloaded for 24 unloading stress delay upper stress level zero load zero stress