Grain Bridging

Bridged Interface Methods for Increasing Fracture Resistance 

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Fig. 11. AI2O2—Al TiO typical microstructure showiag grain bridging, B (SEM backscattered electron image).

Rising R-curve behavior has been attributed to grain bridging traetions and microcrack dilatation in the eraek wake region. 

Fairbanks, C.J. et al. (1987), Crack-interface grain bridging as a fracture resistance mechanism in ceramics , J. Am. Ceram. Soc., 70, 279-94. 

Bennison, S. J. Lawn, B. R. Role of interfacial grain-bridging sliding friction in the crack-resistance and strength properties of nontransforming ceramics. Acta Metallurgica 37, 2659-2671, doi 10.1016/0001-6160(89)90299-x (1989). 

FIGURE 12.5 Surface traces of indentation cracks in alumina-glass dental composite by backscattered scanning electron microscopy (SEM). Grain bridging sites are near the arrows in (a) and transgranular fracture sites in (ft). (From Ref. 21.)... 

Figure 14.11 Microstructural design methods to increase fracture toughness in ceramics in the crack wake, (a) Grain bridging (b) Crack-wake dilatants zones, (c) Microcracking. From M. Hoffman, PhD Thesis.

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