Abstract
Abstract A viscoelastic finite element method is developed to analyze the effect of non-homogeneous matrix compaction on densification of ceramic matrix composites. The heterogeneous matrix of the composite is represented by a system of two or more co-axial cylinders of different initial matrix density. The sintering potential can be expressed in terms of a free strain rate. The free strain rate is derived from the relationship of relative density versus sintering time, measured from the neat matrix sample. The knowledge of free strain rate is a prerequisite for conducting the finite element analysis. For the heterogeneous matrix, two different density-time relationships are assumed, based on the concepts of neck formation and neck growth between contacting particles, and pore coarsening. The results of the finite element analysis show that a nonuniform compaction of the composite generally has a detrimental effect on the densification process.
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