Bar impact tester for dynamic-fracture testing of ceramics and ceramic composites. Technical report

Technical Report · Mon Jul 01 00:00:00 EDT 1991

OSTI ID:6115302

Deobald, L R; Kobayashi, A S

A bar impact test was developed to study the dynamic fracture responses of precracked ceramic bars, Al2O3 and 15/29% volume SiCw/Al2O3. Laser interferometric displacement gage data was used together with dynamic finite element analysis to determine the instantaneous crack length and the dynamic stress intensity factor, K sub ID(t), in the fracturing ceramic bars impacted with impactor velocities of 5.8, 8.0, and 10 m/s. The crack velocities increased from 1400 to 2600 m/s with increasing impact velocity. K sub ID(t) initiated at the expected dynamic fracture toughness and increased with time and with increasing impact velocity. The dynamic initiation fracture toughness and an increasing K sub ID(t) with time and increasing impact velocity were obtained.

• Research Organization: Washington Univ., Seattle, WA (United States). Dept. of Mechanical Engineering
• OSTI ID: 6115302
• Report Number(s): AD-A-241782/2/XAB; UWA/DME/TR-91/6; CNN: N00014-87-K-0326
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
MECHANICAL PROPERTIES
SILICON CARBIDES
CERAMICS
COMPOSITE MATERIALS
CRACK PROPAGATION
CRACKS
DYNAMICS
FINITE ELEMENT METHOD
FRACTURE MECHANICS
FRACTURE PROPERTIES
IMPACT STRENGTH
IMPACT TESTS
LENGTH
RODS
STRESS INTENSITY FACTORS
TEST FACILITIES
VELOCITY
ALUMINIUM COMPOUNDS
CARBIDES
CARBON COMPOUNDS
CHALCOGENIDES
DIMENSIONS
MATERIALS
MATERIALS TESTING
MECHANICAL TESTS
MECHANICS
NUMERICAL SOLUTION
OXIDES
OXYGEN COMPOUNDS
SILICON COMPOUNDS
TESTING
360203* - Ceramics
Cermets
& Refractories- Mechanical Properties
360603 - Materials- Properties