Accession Number : ADP204463
Title : Stress-Strain Modeling in the Damage Regime,
Corporate Author : UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF GEOLOGICAL SCIENCES
Personal Author(s) : Sammis, Charles G.
PDF Url : ADP204463
Report Date : 14 AUG 1995
Pagination or Media Count : 5
Abstract : The micromechanical damage mechanics developed by Ashby and Sammis allows calculation of the failure surface of a brittle solid containing a known density of initial flaws of known size. However, inclusions of damage mechanics into numerical simulations of underground explosions also requires the effective elastic modulus as a function of damage. If the damage is not changed during a stress increment, then the theoretical results of O'Connell and Budianski (O&B) can be used. However, if the stress increment results in an increase in damage, then the effective elastic modulus will be lower than that given by the O&B theory due to the extra energy associated with crack propagation. Because this is a cumbersome calculation not suitable for implementation in numerical simulation codes, we have adopted the empirical approach of lowering the modulus by an additional factor during crack growth, and have evaluated this factor using stress strain data on Barre granite.
Descriptors : *SEISMIC DETECTION, *ROCK MECHANICS, *SEISMIC WAVES, *ARMS CONTROL, *NUCLEAR EXPLOSION DETECTION, STRESS STRAIN RELATIONS, MATHEMATICAL MODELS, SYMPOSIA, SURFACE WAVES, MONITORING, DAMAGE ASSESSMENT, MODULUS OF ELASTICITY, UNDERGROUND EXPLOSIONS, CRACK PROPAGATION, BRITTLENESS, SEISMIC DISCRIMINATION, TREATIES, FAILURE(MECHANICS).
Subject Categories : Government and Political Science
Geology, Geochemistry and Mineralogy
Seismic Detection and Detectors
Distribution Statement : APPROVED FOR PUBLIC RELEASE