Investigation of failure modes in fiber-reinforced ceramic-matrix composites. Master's thesis

Technical Report · Thu Dec 01 04:00:00 EST 1988

OSTI ID:6291927

Moschler, J W

This experimental study was conducted to investigate the damage progression in fiber-reinforced ceramic-matrix composites under tensile loading. As part of this study, the effect of the residual stresses at the fiber-matrix interface on damage progression was evaluated. Composite samples were fabricated from silicon carbide fibers and borosilicate glass matrices. Each glass had a different coefficient of thermal expansion than the fiber and through the variation of this mismatch, the residual stresses at the fiber-matrix interface were varied resulting in different bonding conditions at the fiber-matrix interface. The mechanical properties of the composites were measured using a servo-hydraulic mechanical testing machine. During these tests, transverse strain reversal was observed that is believed to be caused by axial matrix cracks and fiber-matrix debonding. Tensile tests were conducted on the composites using a constant-load straining device in which damage progression was observed using an optical microscope.

• Research Organization: Air Force Inst. of Tech., Wright-Patterson AFB, OH (USA). School of Engineering
• OSTI ID: 6291927
• Report Number(s): AD-A-202705/0/XAB; AFIT/GAE/AA-88D-28
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
BONDING
CARBIDES
CARBON COMPOUNDS
CARBON FIBERS
CERAMICS
COMPOSITE MATERIALS
EQUIPMENT
EXPANSION
FABRICATION
FAILURE MODE ANALYSIS
FIBERS
INTERFACES
JOINING
MATERIALS
MATRIX MATERIALS
MECHANICAL PROPERTIES
MICROSCOPES
OPTICAL EQUIPMENT
SAMPLING
SILICON CARBIDES
SILICON COMPOUNDS
STRESS ANALYSIS
SYSTEM FAILURE ANALYSIS
SYSTEMS ANALYSIS
TENSILE PROPERTIES
THERMAL EXPANSION