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Creep Rupture and Fatigue Behavior of a Notched Oxide/Oxide Ceramic Matrix Composite at an Elevated Temperature

Document Type

Article

Publication Date

3-14-2011

Abstract

Oxide/oxide ceramic matrix composites (CMCs) have the potential to provide a longer lifetime and better strength when subjected to thermomechanical loads due to their inherent resistance to oxidation. Different notches are usually required during their applications. Their time-dependent behavior in the presence of a notch must therefore be characterized. This study investigated the creep rupture and fatigue behavior of a woven oxide/oxide CMC (N720/A) consisting of Nextel™720 (metastable mullite) fibers in an alumina matrix with a 0°/90° fiber orientation having a hole diameter to width ratio of 0.33 at 1200°C in a laboratory air environment. Monotonic tensile tests at 1200°C were also conducted. Fracture surfaces were examined to analyze failure and damage mechanisms. Comparisons with unnotched data showed N720/A to be insensitive to the notch (hole) under monotonic tensile, creep, and fatigue-loading conditions. Deformation under the cyclic loading condition was affected by fatigue and creep; however, the damage mechanisms were the same under creep and fatigue-loading conditions.

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Source Publication

International Journal of Applied Ceramic Technology (ISSN 1546-542X | eISSN 1744-7402)

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