Abstract: A plane finite element model was established for two-phase ceramics. The residual stress distribution in the model was analyzed, and the variation regularity of
internal stress along with the second phase particle’s volumetric proporation was given. The effect to residual stress was also discussed, which is caused by the
variation of relation between the thermal expansion coefficients of the matrices and the second phase particles, the difference between interface stress of theoretical
value and calculated one was discussed, and some viewpoints of toughness enhanced mechanism for this composite material were concluded.

Key words: two-phase composite ceramics, stress distribution, toughness enhanced mechanism