Fatigue of Two Oxide/Oxide Ceramic Matrix Composites at 1200 deg C in Air and in Steam. Effect of Diamond Drilled Effusion Holes
Abstract
The tension-tension fatigue behavior of two oxide-oxide ceramic matrix composites (CMCs) was investigated at 1200 deg C in laboratory air and steam. Both composites consist of a porous oxide matrix reinforced with laminated, woven mullite/alumina (NextelTM720) xC;fibers. The fixC;rst composite had an alumina matrix, while the second had an alumina-mullite matrix. First, we assessed the effects of incorporating mullite into the matrix material on fatigue performance by studying the tension-tension fatigue behavior of alumina-mullite matrix CMC. Second, we evaluated the effects of effusion holes on the alumina matrix CMC's fatigue performance. Specimens containing an array of 17 effusion holes of 0.5-mm diameter were tested in tension-tension fatigue. The fatigue run-out was set to 100,000 cycles. All specimens that achieved fatigue run-out were subjected to tension tests to failure in order to measure the retained tensile properties. Fracture surfaces of the tested specimens were examined, damage and failure mechanisms are discussed.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 25, 2021
- Accession Number
- AD1139773
Entities
People
- Anthony R Cabri
Organizations
- Air Force Institute of Technology