Accession Number:

ADA361714

Title:

Fracture and Fatigue Crack Growth Behavior of Advanced Ceramic Matrix Composites

Descriptive Note:

Final Technical rept. 15 Sep 1995-14 Dec 1998

Corporate Author:

DAYTON UNIV OH

Personal Author(s):

• Buchanan, Dennis J.

Report Date:

1999-03-01

Pagination or Media Count:

6.0

Abstract:

Ultrasonic C-scans have successfully been used to investigate damage from notches and holes in Nexte1610 Aluminosilicate N610AS during tensile and fatigue loading conditions. Sectioned fatigue specimens verified that the region of distributed matrix damage and longitudinal fiber breakage correlated well with the C-scan damage zone at 23C. At 950C the C-scan data showed that the damage zone was confined to the notch plane where damage was primarily due to self similar crack growth. Sectioned samples verified that longitudinal fiber breaks were predominant in the vicinity of the matrix crack. The results from these tests are being employed to develop damage and failure criteria for N610AS and other woven CMC.

Descriptors:

• *CERAMIC MATRIX COMPOSITES
• *CRACK PROPAGATION
• *FATIGUE(MECHANICS)
• DAMAGE
• FAILURE
• FATIGUE
• FIBERS
• LOADS(FORCES)
• TENSILE PROPERTIES

Subject Categories:

• Ceramics, Refractories and Glass
• Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE