Accession Number:

ADP204463

Title:

Stress-Strain Modeling in the Damage Regime,

Descriptive Note:

Corporate Author:

UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF GEOLOGICAL SCIENCES

Personal Author(s):

Report Date:

1995-08-14

Pagination or Media Count:

5.0

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 OConnell and Budianski OB 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 OB 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.

Subject Categories:

  • Government and Political Science
  • Geology, Geochemistry and Mineralogy
  • Seismology
  • Seismic Detection and Detectors
  • Nuclear Weapons

Distribution Statement:

APPROVED FOR PUBLIC RELEASE