Damage accumulation due to microcracking in brittle rock under dynamic loading

Conference · Mon Dec 31 23:00:00 EST 1984

OSTI ID:5828515

Taylor, L M; Kuszmaul, J S; Chen, E P

This paper presents a constitutive model for the dynamic behavior of brittle rock. The essential feature of this model is the treatment of the dynamic fracture process in rock as a continuous accrual of damage where the damage mechanism is attributed to the growth and interaction of a pre-existing network of microcracks. Damage is measured by the volume fraction of the material which has lost its load-carrying capacity. Damage accumulates only under volumetric tension (hydrostatic or mean stress) and is irreversible in nature. In compression, the model gives an elastic/perfectly plastic material response. The model is implemented into a transient, two-dimensional, solid dynamics finite element code. Comparisons between numerical predictions and field data from an oil shale blasting experiment are made and shown to be in good agreement. 10 refs., 10 figs., 2 tabs.

• Research Organization: Sandia National Labs., Albuquerque, NM (USA)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 5828515
• Report Number(s): SAND-85-0604C; CONF-850614-4; ON: DE85009503
• Country of Publication: United States
• Language: English

Related Subjects

04 OIL SHALES AND TAR SANDS
040300 -- Oil Shales & Tar Sands-- Drilling
Fracturing & Mining
58 GEOSCIENCES
580300* -- Mineralogy
Petrology
& Rock Mechanics-- (-1989)
ANVIL POINTS RESEARCH FACILITY
BITUMINOUS MATERIALS
CARBONACEOUS MATERIALS
COMMINUTION
CRACKS
CRATERING EXPLOSIONS
DAMAGE
ENERGY SOURCES
EXPLOSIONS
EXPLOSIVE FRACTURING
FINITE ELEMENT METHOD
FOSSIL FUELS
FRACTURE MECHANICS
FRACTURE PROPERTIES
FRACTURING
FUELS
GEOLOGY
INDUSTRIAL PLANTS
MATERIALS
MATHEMATICAL MODELS
MECHANICAL PROPERTIES
MECHANICS
NUMERICAL SOLUTION
OIL SHALE PROCESSING PLANTS
OIL SHALES
POISSON RATIO
ROCK MECHANICS
STRATIGRAPHY