Accession Number:

ADA343686

Title:

Mechanics of Brittle-Matrix Composites

Descriptive Note:

Final rept. 15 Sep 95-3 Jun 97

Corporate Author:

DAYTON UNIV OH RESEARCH INST

Personal Author(s):

• Kim, Ran Y.

Report Date:

1997-08-01

Pagination or Media Count:

58.0

Abstract:

Model brittle matrix composites SiC fibers and borosilicate glass demonstrated that good matrix cracking stress is achievable only when a good matrix interfacial bond exists. Improvement in this matrix cracking stress can be seen with increasing fiber volume and lowered radial residual compressive stress. The ability to measure the fiber-matrix normal interfacial strength in a composite was demonstrated using a model system in a cruciform sample geometry. An analytical model of ceramic composites based on observed damage progression was developed based on simultaneous stress application and microscopic observations. The damage state of the ceramic composite was successfully incorporated into the model to generate changes in the mechanical behavior. The measurement of coating modulus in BMCs was demonstrated using a micro indentor technique.

Descriptors:

• *MATRIX MATERIALS
• *BRITTLENESS
• *MICROMECHANICS
• MATHEMATICAL MODELS
• MEASUREMENT
• FIBERS
• MECHANICAL PROPERTIES
• DAMAGE
• INTERFACES
• COMPOSITE MATERIALS
• CRACKING(FRACTURING)
• GLASS
• CERAMIC MATERIALS
• RESIDUAL STRESS
• SILICON CARBIDES
• BORON OXIDES
• SILICATES
• COMPRESSIVE PROPERTIES
• RADIAL STRESS

Subject Categories:

• Ceramics, Refractories and Glass
• Laminates and Composite Materials

Distribution Statement:

APPROVED FOR PUBLIC RELEASE