Constitutive acoustic-emission elastic-stress behavior of magnesium alloy, Volume 2839
National Aeronautics and Space Administration, 1977 - Acoustic emission - 39 pages
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50 UPPER STRESS Acoustic Emission activation stress AE activity AE-stress constitutive relations AE/Bauschinger Strain Model AE/elastic stress constitutive Agarwal aluminum applied shear stress atom radius Bauschinger effect BEGINS HERE UPPER burst emissions change in stress constant cr h cumulative counts cumulative emission counts Cumulative Loading decrease dependent different specimens direction of loading Doctoral Thesis effective friction stress elastic stress equipment and techniques Full Unload Tests illustrated in Fig increasing upper stress Investigation Kerawalla load history loading and unloading lower stress rates m2 sec macroscopic yield stress magnesium alloy Magnesium Specimen maximum stress monitoring of elastic NASA Nondestructive Testing number of cycles parameters partial unload tests Plastic pre-stress Repeated loading Sankar shown in Fig solute atoms SPECIMEN AZ3IB Stress-Strain Curve stresses by acoustic Tensile TEST BEGINS thermal throughout the test trends University of Michigan Unloading and Loading unloading emission behavior unloading stress delays UPPER STRESS LEVEL versus