13th International Conference on Fracture June 16–21, 2013, Beijing, China 5 weft direction, the load was mainly carried by weft yarns and then by the weft and contacted warp yarns. What’s more, being interlocked by tightly contacted warp yarns, the lateral movements of the weft yarns were well restricted. Conversely, in the warp direction, the fewer distributed weft yarns couldn’t perfectly limit the lateral movements of warp yarns, and the sinusoidal warp yarns may weaken the ability of resistance to failure. ILSS for 2D-SiC/SiC is considerably higher than that of the 2D-C/SiC. The poor ILSS for 2D-C/SiC is mainly associated with the oxidation of fibers. This will be discussed further from the SEM observations. 3.3 Fracture morphology Fig. 5 presents typical optical micrographs of fracture surface for the three kinds of composites. Figure 4. ILSS of the three kinds of composites at 1173K in air a b b c d a 2.5D-C/SiC-weft2.5D-C/SiC-warp 2D-C/SiC 2D-SiC/SiC 0 10 20 30 40 50 60 70 80 ILSS/MPa Specimen type
RkJQdWJsaXNoZXIy MjM0NDE=