Accession Number:

ADA235286

Title:

Dynamic Fracture Responses of Al2O3, Si3N4 and SiCw/Al2O3

Descriptive Note:

Technical rept. Aug 89-Mar 1991

Corporate Author:

WASHINGTON UNIV SEATTLE DEPT OF MECHANICAL ENGINEERING

Personal Author(s):

• Takagi, Y.
• Kobayashi, A. S.

Report Date:

1991-04-04

Pagination or Media Count:

15.0

Abstract:

A hybrid experimental-numerical procedure was used to characterize the dynamic fracture responses of alumina A12O3, silicon nitrides, Si3N4 and silicon-carbide whiskeralumina matrix SiC subWA12O3 composite. A laser interferometric displacement gage was used to determine through the crack opening displacement COD, the instantaneous crack tip location during rapid fracture at room temperature and 1000 C. Consistent with previous finding, the dynamic crack arrest stress intensity factor did not exist in the ceramics and ceramic matrix composite studied.

Descriptors:

• *CRACKS
• *COMPOSITE MATERIALS
• DYNAMIC RESPONSE
• DISPLACEMENT
• MATRIX MATERIALS
• FRACTURE(MECHANICS)
• ROOM TEMPERATURE
• CERAMIC MATERIALS
• ALUMINUM OXIDES
• NUMERICAL METHODS AND PROCEDURES
• GAGES
• INTERFEROMETERS
• SILICON NITRIDES
• HYBRID SIMULATION
• POSITION(LOCATION)
• OPENING(PROCESS)

Subject Categories:

• Ceramics, Refractories and Glass
• Laminates and Composite Materials

Distribution Statement:

APPROVED FOR PUBLIC RELEASE