イメージベース有限要素法によるAl_2O_3/YAG共晶複合材料の定常クリープ特性の推算

概要

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Al_2O_3/YAG eutectic composite has been developed for a structural material used in ultra high temperature environments more than 1500℃ such as in a gas turbine. Creep behavior is one of the important material properties in ultra high temperature materials. In the present study, we propose image-based finite element analysis for estimating the steady state creep behavior of the Al_2O_3/YAG eutectic composite. In the image-based finite element analysis, micro-structure of the material taken by a SEM is modeled into a finite element mesh using a software for image processing. Then finite element creep analysis is carried out to obtain the steady state creep behavior of the Al_2O_3/YAG eutectic composite by using steady state creep constitutive equations for both Al_2O_3 single crystal and YAG single crystal. The results of steady state creep behavior obtained from the image-based finite element analysis are compared with the experimental results. It is found that the steady state creep behavior of the Al_2O_3/YAG eutectic composite is accurately estimated by the image-based finite element analysis. Furthermore, we examine the effect of volume fractions of the constituents on the steady state creep behavior of the Al_2O_3/YAG eutectic composite.
2002-11-15