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Static Fatigue of SiC Multifilament Tows at Temperatures up to 1200 °C in Air

LMT (CNRS/Ecole Normale Supérieure Paris-Saclay) 61, avenue du Président Wilson, 94230 Cachan, France
Ceramics 2019, 2(3), 426-440; https://doi.org/10.3390/ceramics2030033
Received: 5 May 2019 / Revised: 23 May 2019 / Accepted: 25 June 2019 / Published: 1 July 2019
(This article belongs to the Special Issue Damage and Lifetime of Ceramic Matrix Composites)
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Abstract

SiC-based fibers are sensitive to delayed failure under constant load at high temperatures in air. Static fatigue at intermediate temperatures < 800 °C was attributed to slow crack growth from flaws located at the surface of fibers, driven by the oxidation of free carbon at grain boundaries. The present paper examines the static fatigue behavior of SiC-based Hi-Nicalon fibers at high temperatures up to 1200 °C and Hi Nicalon S fibers at intermediate temperatures (500–800 °C). The degradation of stress- rupture time relation of multifilament tows with increasing temperature was investigated. Predictions of tow lifetime based on critical filament-based model of tow failure were compared to experimental stress-rupture time diagrams. Critical filaments are characterized by strength–probability relation. The critical filament-based model was found to describe satisfactorily the static fatigue behavior of fiber tows at these temperatures. The influence of various factors on lifetime as well as the origins of variability is analyzed. View Full-Text
Keywords: fiber; tow; lifetime; static fatigue; slow crack growth; fracture probability fiber; tow; lifetime; static fatigue; slow crack growth; fracture probability
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Lamon, J. Static Fatigue of SiC Multifilament Tows at Temperatures up to 1200 °C in Air. Ceramics 2019, 2, 426-440.

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