Abstract
The fatigue behavior of a Ceramic Matrix Composite (CMC) at intermediate temperature under air is investigated. Because of the low density and the high tensile strength of CMC, they offer a good technical solution to design aeronautical structural components. The aim of the present study is to compare the behavior of this composite under static and cyclic loading. Comparison between incremental static and cyclic tests shows that cyclic loading with an amplitude higher than 30% of the ultimate tensile strength has significant effects on damage and material lifetimes. In order to evaluate the remaining lifetime, several damage indicators, mainly based on the investigation of the liberated energy, are introduced. These indicators highlight critical times or characteristic times, allowing an evaluation of the remaining lifetime. A link is established with the characteristic time around 25% of the total test duration and the beginning of the matrix cracking during cyclic fatigue.
Highlights
Ceramic matrix composites are very interesting structural materials for high temperature applications
The results indicate that the Acoustic emission (AE) method could be more suitable than conventional methods to reveal critical times
This paper focuses on the investigation of damage during fatigue tests of Ceramic Matrix Composite (CMC) at intermediate temperature
Summary
Ceramic matrix composites are very interesting structural materials for high temperature applications. Due to the difference of stresses between bridging fibers and the matrix at the level of the matrix crack, interface between fiber and matrix is subjected to a shear stress, leading to a debonding of fibers and matrix [2]. This material behavior is affected by oxidation of interphases and fibers and the ultimate failure is governed by slow crack growth in the fibers [3]. Under air and for temperatures below 550 ◦ C, self-healing is not important enough to fully protect the material
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