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Trans. JWRI, Vol. 28 (1999), No. 2, pp. 45-50.


Development of Computational Evaluation Methods for Creep Deformation of SiC/SiC Composites

Hisashi SERIZAWA, Motooki ANDO, Charles A. Lewinsohn and Hidekazu MURAKAWA

ABSTRACT

     In order to analyze crack propagation behavior in SiC/SiC composites, new computer simulation methods using time dependent interface elements were developed and applied to time-dependent crack growth in SiC/SiC composite under four-point bending tests on single-edge-notched beam bend-bars. The time-dependent crack growth in SiC/SiC composite was simulated by two methods, in which the creep property was introduced into the interface elements according to : 1) the general method of FEM analysis and, 2) a new method making the best use of the potential function. In both cases, the stage-II slow crack growth of a general creep deformation was simulated. Furthermore, by using the new method, not only the stage-III crack growth but also transition phenomena from the stage-II to stage-III could be simulated. So the new method is considered to have the potential capability to demonstrate the time-dependent crack growth behavior in SiC/SiC composite.


KEY WORDS: SiC/SiC Composites, SiC Fibers, Creep, Ceramics, Finite Element Method, Interface Element

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