Acoustic emission during unloading of elastically stressed magnesium alloy
Samson S. Lee, James H. Williams, United States. National Aeronautics and Space Administration, Massachusetts Institute of Technology
National Aeronautics and Space Administration, 1977 - 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 Behavior Composite Materials corresponding to point Cumulative AE counts cumulative unloading AE cycle-independent cycles was recorded delay was recorded elastic constitutive parameter elastic stress equation G.P. Emerson J.H. Williams Kaiser effect Kerawalla LEAST SQUARES left completely unloaded level was decreased load and tension loaded to point loading AE loading and unloading loading pattern loading-unloading cycle magnesium alloy Massachusetts Institute material constitutive parameter maximum stress MN/m sec monitoring of elastic NASA Nondestructive Testing NUMBER observe the Kaiser Performing Organization Ph.D point along line prior to unloading quasi-statically cycled Report required before AE resulting AE S.S. Lee specimen was loaded standards for AE straight line stress constitutive relations stress increment stress levels Curve subsequently the data tensile stress Thesis Unclassified University of Michigan unloaded for 24 unloading stress delay upper stress level