Continuum damage mechanics studies on the dynamic fracture of concrete

Conference · Tue Jan 01 04:00:00 EST 1985

OSTI ID:6488150

Chen, E P

The dynamic fracture of concrete in tension is studied by applying a continuum damage model. In this model, the degree of damage in concrete corresponds to the fraction of concrete volume that has been tension relieved, and tensile microcracking has been taken as the damage mechanism. In compression, the concrete is assumed to respond in an elastic/perfectly plastic manner. Strain-rate effects have been explicitly included in the model. Accumulation of damage in the material is reflected by the progressive weakening of the material stiffness. Examples involving center- and edge-cracked plate specimens subjected to the action of step and ramp loads are used to demonstrate the material responses predicted by the model. The bulk pressure versus strain relationships at locations close to the crack tip clearly show strain-softening behavior. The damage tends to localize around the crack and its extent in the specimen is dependent upon both the crack geometry and the loading type. These results are presented and their implications are discussed. The model has been successfully applied to predict the responses of oil shale in blasting operations. 9 refs., 22 figs.

• Research Organization: Sandia National Labs., Albuquerque, NM (USA)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 6488150
• Report Number(s): SAND-85-0908C; CONF-851247-1; ON: DE86002584
• Country of Publication: United States
• Language: English

Related Subjects

04 OIL SHALES AND TAR SANDS
040300 -- Oil Shales & Tar Sands-- Drilling
Fracturing & Mining
36 MATERIALS SCIENCE
360603* -- Materials-- Properties
BITUMINOUS MATERIALS
BUILDING MATERIALS
CARBONACEOUS MATERIALS
COMMINUTION
CONCRETES
CRACKS
DAMAGE
DYNAMIC LOADS
ENERGY SOURCES
FORECASTING
FOSSIL FUELS
FRACTURING
FUELS
MATERIALS
MATHEMATICAL MODELS
MECHANICAL PROPERTIES
MECHANICS
OIL SHALES
STRAIN RATE
TENSILE PROPERTIES