Transverse Cracking in a Fiber Reinforced Ceramic Matrix Composite

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Abstract:

The purpose of this study was to investigate the transverse cracking behavior of a fiber reinforced ceramic matrix composite. The major objectives were to determine the crack initiation stress and the minimum transverse crack spacing for different cross-ply lay-ups of SiC1723, to provide explanation for the differences in the performance of the lay-ups, and to compare the test results to available theoretical models and to other composite systems. The thickness of the transverse ply was found to have a great effect on the transverse cracking behavior of laminates. The saturation crack spacing decreased as the transverse ply thickness was decreased. Classical laminate theory was used to predict crack initiation stresses and modulus of elasticity. A crack spacing theory based on shear lag analysis was applied. Comparisons were made to glassepoxy and graphiteepoxy systems.

Author(s):
Bachmann, Steven E.
Author Organization(s):
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
Descriptive Note:
Master's thesis,
Pagination:
0112

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
AFIT/GAE/ENY/90D-2
Monitor Series:
WRDC
 Subject Terms
Joint Capability Areas:
JCA_5_Command and Control; JCA_1_Force Support; JCA_5.1.1_Establish and Maintain Unity of Effort with Mission Partners; JCA_5.1_Organize; JCA_5.3_Planning; JCA_3.2_Engagement; JCA_3_Force Application; JCA_4.6_Engineering; JCA_1.2_Force Preparation; JCA_3.2.1_Kinetic Means; JCA_1.2.3_Educating; JCA_1.2.5_Lessons Learned; JCA_1.3_Human Capital Management
Modernization Areas:
Hypersonics
Communities of Interest:
Air Platforms
Descriptor(s):
*TEST AND EVALUATION, STRESSES, THICKNESS, MODELS, LAMINATES, TRANSVERSE, CRACKS, THEORY, MODULUS OF ELASTICITY, SATURATION, DELAY, BEHAVIOR, SHEAR PROPERTIES, CRACKING(FRACTURING)
Field(s)/Group(s):
Laminates and Composite Materials
Keyword(s):
*FIBER REINFORCED COMPOSITES, *CERAMIC MATRIX COMPOSITES, COMPOSITE, TRANSVERSE CRACKING, CERAMIC, FIBER, CRACK DENSITY, MATRIX, THESES
Report Date:
1990 Dec 01