Skip to main content Accessibility help

Behavior of Crack Growth Resistance in Toughened Silicon Nitride Ceramics

  • H. Kawamoto (a1), K. Hiramatsu (a1), Y. Takigawa (a1), A. Okada (a2) and H. Usami (a3)...


Testing methods for crack-growth resistance-curve (R-curve) behavior were investigated and developed to analyze the toughened mechanism in polycry stalline ceramics. These methods are a biaxial-flexure method for small-scale disc-shaped specimens with micro-indentation cracks and a single-edged notched beam flexural method with crack stabilizers. In both methods, the growing crack length is measured directly as a function of applied stress, using the system that consist of a microscope and a CCD camera. Applying these testing methods, R-curve behavior of a toughened silicon nitride with a preferred orientation of elongated grains was evaluated to characterize the toughened mechanism, comparing with the behavior in a commercially available silicon nitride. The behavior having these rising R-curves is discussed with emphasis on the effects of microstructure such as grain-growth and grain-orientation, and resultant grain-bridgings behind the crack-tip.



Hide All
1. Kawamoto, H., Ceramic Transactions Volume 49, Am. Ceram. Soc., 173 (1995).
2. Hirao, K., Ohashi, M., Brito, M. E., and Kanzaki, S., J. Am. Ceram. Soc., 78 [6], 1687 (1995).
3. Smith, S. M. and Scattergood, R. O., J. Am. Ceram. Soc., 79 [1], 129 (1996).
4. Smith, S. M. and Scattergood, R. O., J. Am. Ceram. Soc., 75 [2], 305 (1992).
5. Marshall, D. B., Am. Ceram. Soc. Bull., 59 [5], 551 (1980).
6. Okada, A., Hiramatsu, K., and Usami, H., 6th Int. Sym. on Ceramic Materials and Components for Engines, (Japan Fine Ceramics Association, Tokyo, 1997), p.770.
7. Srawly, J. E., Int. J. Fract. Mech., 12, 475 (1976).
8. Gilbert, C. J., Cao, J. J., De Jonghe, L. C., and Ritchie, O., J. Am. Ceram. Soc., 80 [9], 2253 (1997).
9. Rice, R. W., J. Am. Ceram. Soc., 77 [9], 2479 (1994).
10. Lawn, B., Fracture of brittle solids, 2nd ed. (Cambridge Univ. Press, Cambridge, 1993), p.44.


Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed