Investigation of Failure Modes in Fiber Reinforced Ceramic Matrix Composites
Abstract
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 boro-silicate 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 which 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. Keywords: Carbon fibers; Military theses; Fiber reinforcement.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1988
- Accession Number
- ADA202705
Entities
People
- Joseph W. Moschler Jr.
Organizations
- Air Force Institute of Technology