Accession Number:

ADA289418

Title:

Fatigue Behavior of a Cross-Ply Ceramic Matrix Composite Subjected to Tension-Tension Cycling with Hold Time.

Descriptive Note:

Master's thesis,

Corporate Author:

AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING

Personal Author(s):

• Grant, Scott A.

Report Date:

1994-12-01

Pagination or Media Count:

138.0

Abstract:

This study was carried out to investigate the elevated temperature behavior of the SiC-MAS5 cross- ply O9O4S ceramic matrix composite manufactured by Corning Inc. to fatigue with loading waveforms that combine the characteristics of stress rupture and high cycle fatigue. The test results were compiled in the form of S-N cycles to failure, S-T exposure time versus cycles to failure, S-S energy exposure versus cycles to failure, normalized modulus degradation, strain progression, and hysteresis loop progression. From the mechanical behavior demonstrated by these curves, relationships between the effect of the environment and loading waveform were developed. In addition, a post-mortem SEM analysis of the fracture surface was conducted and the results compared to the mechanical behavior.

Descriptors:

• *CERAMIC MATRIX COMPOSITES
• *CERAMIC MATERIALS
• *FATIGUE(MECHANICS)
• STRESS STRAIN RELATIONS
• FATIGUE LIFE
• DEGRADATION
• MACHINING
• TENSILE STRESS
• THESES
• STRAIN(MECHANICS)
• FRACTURE(MECHANICS)
• SPACE SHUTTLES
• CREEP
• PROTECTIVE COATINGS
• CERAMIC FIBERS
• FAILURE(MECHANICS)
• SILICON CARBIDES
• TURBOMACHINERY
• CYCLIC LOADS
• POLISHING

Subject Categories:

• Ceramics, Refractories and Glass
• Laminates and Composite Materials

Distribution Statement:

APPROVED FOR PUBLIC RELEASE