Analysis of Asymmetrical Creep of a Ceramic at 1350°C by Digital Image Correlation

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[1] Leplay, Paul
[2] Lafforgue, Olivier
[3] Hild, François
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Leplay, Paul (paul.leplay@saint-gobain.com) | 1600年 / Blackwell Publishing Inc., Postfach 10 11 61, 69451 Weinheim, Boschstrabe 12, 69469 Weinheim, Deutschland, 69469, Germany卷
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The glass industry requires the use of innovative ceramics that enable for long lifetimes. At very high temperatures; one of the key parameters for ceramics is their creep resistance. The characterization of the creep behavior; usually assessed through flexural tests; can be complex when an asymmetry appears between tension and compression. To detect and quantify such asymmetrical behaviors; the use of Digital Image Correlation (DIC) is proposed. First; several challenges are to be tackled for DIC at high temperature; namely; the random pattern stability; the radiation filtering and the heat haze. They are exacerbated by the limited possibilities to heat ceramics; the nonuniform strain fields and their low levels. Beyond several experimental developments; the strain uncertainties are decreased thanks to the use of two global approaches of DIC based on ad hoc finite-element kinematics. Last; the proposed methodology is applied to the analysis of asymmetric creep at 1350°C of an industrial zircon ceramic designed for its high creep resistance. © 2015 The American Ceramic Society;
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