Fatigue of Two Oxide/Oxide Ceramic Matrix Composites at 1200 deg C in Air and in Steam. Effect of Diamond Drilled Effusion Holes

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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.

Author(s):
Cabri, Anthony R
Author Organization(s):
AIR FORCE INSTITUTE OF TECHNOLOGY WRIGHT-PATTERSON AFB OH
Funding Organization(s):
AIR FORCE INSTITUTE OF TECHNOLOGY WRIGHT-PATTERSON AFB OH, WRIGHT-PATTERSON AFB , OH
Document Type:
Technical Report/Master's Thesis
Publication Date:
2021 Mar 25
Pagination:
105

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution Code:
A - Approved For Public Release
Distribution Statement: Public Release

RECORD

Collection: TRECMS
Identifying Numbers
Report Number(s):
AFIT-ENY-MS-21-M-291
Subject Terms
Modernization Areas:
Microelectronics
Communities of Interest:
Advanced Electronics
Descriptor(s):
ceramic matrix composites, materials science, composite materials, tensile strength, materials, mechanics, air force, engineering, high temperature, materials testing, tensile properties, turbines, advanced materials, materials laboratories, materials processing, mechanical properties, united states
Keyword(s):
cmc (ceramic matrix composites), tension-tension fatigue, EFFUSION HOLES, braze joining, oxide-oxide cmc, nextel 720, alumina, cusil active brazing alloy
Subject Categories:
Physics; Materials; Materials
Creation Date:
2021 Jul 08
Update Date:
2021 Sep 27