S. Tariolle et al /Journal of the European Ceramic Sociery 25 (2005)3639-3647 E￥o Fig. 12. Lengths of crack deflection in function of the relative thickness in composites(C$55)with interlayers with com starch. displacement (mm) Fig. 14. Load-displacement curve and fractography of a composite (l-G) with interfaces of graphite. The arrow next to the fractography indicates the direction of the crack propagation. 500gm displacement(mm) Fig. 13. (a)Macrostructure of a composite with interfaces of graphite(l-G). (b)Macrostructure of a composite with interfaces of boron nitride(I-BN) 4. Comparison of the reinforcement by crack deflection in the different composites tested In order to compare the different composites, the different esults of work of rupture (Fig. 16), length of crack deflection Fig 15. Load-c ent curve and fractography of a composite(I-BN) (Fig. 17), apparent fracture toughness and apparent friction with interfaces of boron nitride. The arrow next to the fractography indicates stress were analyzed the direction of the crack propagation.S. Tariolle et al. / Journal of the European Ceramic Society 25 (2005) 3639–3647 3645 Fig. 12. Lengths of crack deflection in function of the relative thickness in composites (CS55) with interlayers with corn starch. Fig. 13. (a) Macrostructure of a composite with interfaces of graphite (I-G). (b) Macrostructure of a composite with interfaces of boron nitride (I-BN). 4. Comparison of the reinforcement by crack deflection in the different composites tested In order to compare the different composites, the different results of work of rupture (Fig. 16), length of crack deflection (Fig. 17), apparent fracture toughness8 and apparent friction stress8 were analyzed. Fig. 14. Load–displacement curve and fractography of a composite (I-G) with interfaces of graphite. The arrow next to the fractography indicates the direction of the crack propagation. Fig. 15. Load–displacement curve and fractography of a composite (I-BN) with interfaces of boron nitride. The arrow next to the fractography indicates the direction of the crack propagation