Failure Characterization of a Fiber Reinforced Ceramic Matrix Composite with Circular Holes
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
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The purpose of this study was to investigate the performance of a fiber reinforced ceramic matrix composite with circular holes. The specific objectives were to 1 determine the relationship between tensile failure stress and the ratio of hole diameter to specimen width, and 2 to examine the initiation and progression of damage. The ceramic matrix composite used was SiC 1723, composed of continuous silicon titanium carbide fibers in an aluminosilicate glass ceramic matrix. Uniaxial tensile tests were performed at room temperature on two different layups unidirectional 08, and 0902S symmetric. Each layup was tested at three diameter-to-width ratios. Damage data were gathered using acoustic emission, strain gauges, replication techniques, and ultrasound C-scan. Specimens were also sectioned after damage and examined. Strain data from the region of the hole provided the best indication of initial damage in the 08 layup. Acoustic emission techniques accurately indicated the point of initial damage in the 0902S layup. The Whitney-Nuismer failure theory for notched composites was adapted to allow for specimens of varying widths, and was found to fit the experimental data well.
- Ceramics, Refractories and Glass
- Refractory Fibers
- Laminates and Composite Materials