Fracture Toughness of Ceramic Composite Containing Damage Eutectics and Transformation Particles

The toughness of eutectic ceramic composites are obtained by multiple toughening mechanisms involving crack-bridging and pull-out of rod-shaped eutectics, as well as stress-induced transformation toughening. In the loading procedure, damage will emerge in the rod-shaped eutectic.The transformation toughening of eutectic ceramic composites are obtained by stress-induced transformation mechanisms. Firstly, defining a parabola transformation yield function, the transformation plastic strain increment is gotten by transformation plastic potential function. Secondly, the transformation region is determined by the stress field associated with a crack involves I-II combination. Thirdly, on base of weighted function method, the screening impact of transformation particles for mixed-mode I-II crack is gained. The result shows that the transformation toughening is associated with the fraction of the transformation particles, the elastic modulus of composite ceramic and the half width of transformation region.