The creep of silicon nitride tensile specimens has been modeled and incorporated into finite element software to predict the behavior of structural components. The experimental results are for the creep deformation of HIP'ed, yttria-doped silicon nitride at temperatures up to 1400°C. Results are for both homogeneous and joined specimens. This experimental data base was modeled using two approaches: Arrhenius law representation of the steady state phase, and theta projection method representation of both primary and secondary stages. The Arrhenius law has been incorporated into commercial finite element software and used to predict the creep deformation behavior and time to failure for a simulated component represented by a notched tensile specimen.
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