Fracture-mechanics analysis of glass ceramics

Conference · Thu Jan 01 04:00:00 EST 1981

OSTI ID:6011334

Mecholsky, J J

Elastic modulus, fracture toughness and strength, and critical flaw size were measured as a function of microstructure, crystal morphology, and percent crystallization in silicate and nonsilicate glass ceramics. Calculations of the critical stress intensity factor (fracture toughness), K/sub IC/, from measurements of the critical flaw size and fracture strength of flexural bars (0.5 to 3.0 MPa m/sup 1/2/) were compared to independent measurements of K/sub IC/ from fracture mechanics specimens (double cantilever beam and the short rod specimen). Measurement of fracture surface features on fine-grained glass ceramic materials showed that increases in fracture toughness with increased crystallization at a constant critical flaw size was due to microcracking and internal stress at the grain boundaries.

• Research Organization: Sandia National Labs., Albuquerque, NM (USA)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 6011334
• Report Number(s): SAND-80-2710C; CONF-810528-13; ON: DE81030125
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
CERAMICS
CRACKS
CRYSTAL STRUCTURE
CRYSTALLIZATION
EQUATIONS
FRACTURE MECHANICS
FRACTURE PROPERTIES
GLASS
MECHANICAL PROPERTIES
MECHANICS
MICROSTRUCTURE
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
SILICATES
SILICON COMPOUNDS