Microcrack damage model of brittle rock
In this report, some extensions and improvements of a recently proposed model which describes stress and time-dependent microcrack growth in brittle rock are discussed. The model is extended to a fully three dimensional description of damage nucleation and growth. In addition, a vectorial description of the damage induced by microcrack growth is proposed. Several improvements in the description of crack growth on the microscale are also discussed. These improvements lead to a development of damage surfaces (surfaces of constant damage in stress space) which is in good agreement with the results of recent experiments in which acoustic emissions were used to trace the progression of damage surfaces in a brittle rock deformed under triaxial compression. Finally, a failure criterion for brittle rock based on the concept of critical damage is proposed and discussed in detail. Several examples of model calculations under a variety of stress states and histories are presented. 27 references, 17 figures.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 5651370
- Report Number(s):
- SAND-83-1590; ON: DE84002088
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
58 GEOSCIENCES
580300* -- Mineralogy
Petrology
& Rock Mechanics-- (-1989)
BRITTLENESS
CRACK PROPAGATION
DEFORMATION
FAILURES
FRACTURE MECHANICS
MATHEMATICAL MODELS
MECHANICAL PROPERTIES
MECHANICS
ROCK MECHANICS
STRESS INTENSITY FACTORS
STRESSES
TIME DEPENDENCE