Combining acoustic emission locations and a microcrack damage model to study development of damage in brittle materials

Conference · Mon Jan 01 04:00:00 EST 1990

DOI:https://doi.org/10.1016/0148-9062(91)91226-H· OSTI ID:7188894

Holcomb, D J; Stone, C M; Costin, L S

Under compressive stresses, brittle polycrystalline materials fail as the result of the growth, interaction and coalescence of microcracks. To predict the deformation of damaging material, constitutive laws developed for such materials must incorporate the effects of crack size, density, orientation, and interaction. A method of incorporating the accumulation and growth of microcracks into a continuum model is to use a measure of microcrack growth and interaction defined as damage. Although a number of damage theories have been proposed, there is no generally accepted experimental technique for detecting and measuring damage. Acoustic emissions (AE) have been correlated with microcrack nucleation and growth. We propose that AE locations and density are useful measures of damage that can be correlated with calculated damage. Our approach is to use acoustic emissions (AE) and computer modeling to study the development of damage in geomaterials. 7 refs., 2 figs.

• Research Organization: Sandia National Labs., Albuquerque, NM (USA)
• Sponsoring Organization: DOE/DP
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 7188894
• Report Number(s): SAND-89-2913C; CONF-900646--3; ON: DE90005195
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603 -- Materials-- Properties
58 GEOSCIENCES
580000* -- Geosciences
ACOUSTIC EMISSION TESTING
ACOUSTIC TESTING
BRITTLENESS
COMPRESSION
COMPUTERIZED SIMULATION
CRACK PROPAGATION
CRACKS
DEFORMATION
MATERIALS TESTING
MECHANICAL PROPERTIES
NONDESTRUCTIVE TESTING
ROCKS
SIMULATION
TESTING